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1991 Vol. 13, No. 5
Display Method:
1991, 13(5): 449-455.
Abstract:
The synthesis technique for multivalued CMOS circuits based on transmi-ssion function theory is discussed. By comparing the CMOS circuits based on transmission function theory with the T gate, it shows that their action priciples are identical. Based on it, the synthesis method for multivalued muhivariable CMOS circuits using function decom-position is proposed.
The synthesis technique for multivalued CMOS circuits based on transmi-ssion function theory is discussed. By comparing the CMOS circuits based on transmission function theory with the T gate, it shows that their action priciples are identical. Based on it, the synthesis method for multivalued muhivariable CMOS circuits using function decom-position is proposed.
1991, 13(5): 456-460.
Abstract:
The theory of differential current switches which applies to the designof multivalued ECL circuits is introduced. In this theory, the switching state of differential transisror pair and signal in ECL circuits are described by switching variable and quaternary signal variable, respectivcly. The connection opemtions bctween the two kinds of variables are introduced to describe the action process between switching element and signal in the circuits.Based on this theory, two kinds of interface circuits--2-4 encoder and 4-2 decoder are de- signed. The computer simulation for the designed circuits by using SPICE program confirm that both circuits have correct logic functions, desired DC transfer characteristics and transi- ent characteristics. These interface circuits are compatible with binary circuits in the integra- ted process, the power supply equipment, the logic stage and the transient characteristic. Therefore, they can be used as input-output interface of the existing binary ECL integrated circuits so as to decrease the number of pins of a chip and the connections between chips.
The theory of differential current switches which applies to the designof multivalued ECL circuits is introduced. In this theory, the switching state of differential transisror pair and signal in ECL circuits are described by switching variable and quaternary signal variable, respectivcly. The connection opemtions bctween the two kinds of variables are introduced to describe the action process between switching element and signal in the circuits.Based on this theory, two kinds of interface circuits--2-4 encoder and 4-2 decoder are de- signed. The computer simulation for the designed circuits by using SPICE program confirm that both circuits have correct logic functions, desired DC transfer characteristics and transi- ent characteristics. These interface circuits are compatible with binary circuits in the integra- ted process, the power supply equipment, the logic stage and the transient characteristic. Therefore, they can be used as input-output interface of the existing binary ECL integrated circuits so as to decrease the number of pins of a chip and the connections between chips.
1991, 13(5): 461-467.
Abstract:
The sensor location uncertainty of an array degrades severely its performance of the target-source's distance detection and direction finding. In the case of far field sources, for the direction finding technique based on decompositing the eigenvalue of a matrix, a new method is presented. The method calibrates the sensor location uncertainty utilizing three radiation sources whose directions are not known accurately. In this paper a new iterative algorithm using the extracted signal subspace is developed, and the iterative procedure is analysed in detail to show why this algorithm converges to the global optimal point. It is the very key point that a technique for selecting directions of calibrating sources is given. Simulation results illustrate that the new method presented here is successful and practicable.
The sensor location uncertainty of an array degrades severely its performance of the target-source's distance detection and direction finding. In the case of far field sources, for the direction finding technique based on decompositing the eigenvalue of a matrix, a new method is presented. The method calibrates the sensor location uncertainty utilizing three radiation sources whose directions are not known accurately. In this paper a new iterative algorithm using the extracted signal subspace is developed, and the iterative procedure is analysed in detail to show why this algorithm converges to the global optimal point. It is the very key point that a technique for selecting directions of calibrating sources is given. Simulation results illustrate that the new method presented here is successful and practicable.
1991, 13(5): 468-474.
Abstract:
Basing upon the performance of bit-serial realization, the concept called the-bit-serial trimmed mean filter (-TMF) is proposed. The main contents are as follows: (1) the definition of the a-TMF is give; (2) an example is given for the algorithm of the -TMF; (3) the basie performances of the bit-serial -TMF are discussed; (4) the circuit of the analog/digital hybrid realization for real-time signal processing is given.
Basing upon the performance of bit-serial realization, the concept called the-bit-serial trimmed mean filter (-TMF) is proposed. The main contents are as follows: (1) the definition of the a-TMF is give; (2) an example is given for the algorithm of the -TMF; (3) the basie performances of the bit-serial -TMF are discussed; (4) the circuit of the analog/digital hybrid realization for real-time signal processing is given.
1991, 13(5): 475-481.
Abstract:
A conformal transformation method is presented to solve a, the attenuation constant of TEM mode transmission line. This method is suitable for all that can be mapped into conventional coaxial line or flat-plate capacitor through several conformal transformations (including numerical conformal transformations). Finally, some analytical and numerical re-sults are given.
A conformal transformation method is presented to solve a, the attenuation constant of TEM mode transmission line. This method is suitable for all that can be mapped into conventional coaxial line or flat-plate capacitor through several conformal transformations (including numerical conformal transformations). Finally, some analytical and numerical re-sults are given.
1991, 13(5): 482-488.
Abstract:
The two-dimensional numerical simulation of energy transport for MOS FETs is presented, in which the effect of generation, recombination and temperature gradiem of carriers on the characteristics of the devices are considered. An improved mobility model is also proposed. The numerical results of micrometer and submicrometer MOSFETs show that the present model fits esperiment very well.
The two-dimensional numerical simulation of energy transport for MOS FETs is presented, in which the effect of generation, recombination and temperature gradiem of carriers on the characteristics of the devices are considered. An improved mobility model is also proposed. The numerical results of micrometer and submicrometer MOSFETs show that the present model fits esperiment very well.
1991, 13(5): 489-495.
Abstract:
The microstructure and optical properties of a buried layer formed by O+ (200keV, 1.81018/cm2) and N+ (180keV, 41017/cm2) co-implantation and annealed at 1200 ℃ for 2h have been investigated by Auger electron, IR absorption and reflection spectroscopic measurements. The results show that the buried layer consists of silicon dioxide and SiO2 (x2) and the nitrogen segregates to the wings of the buried layer where it forms an oxyni-tride. By detail theoretical analysis and computer simulation of the IR reflection interference spectrum, refractive index profiles of the buried layer woere obtained.
The microstructure and optical properties of a buried layer formed by O+ (200keV, 1.81018/cm2) and N+ (180keV, 41017/cm2) co-implantation and annealed at 1200 ℃ for 2h have been investigated by Auger electron, IR absorption and reflection spectroscopic measurements. The results show that the buried layer consists of silicon dioxide and SiO2 (x2) and the nitrogen segregates to the wings of the buried layer where it forms an oxyni-tride. By detail theoretical analysis and computer simulation of the IR reflection interference spectrum, refractive index profiles of the buried layer woere obtained.
1991, 13(5): 496-501.
Abstract:
The design principles and a practical circuit of a Ku-band broadband me-chanical tuning Gunn Oscillator is described The oscillator is stabilized by bimetal compen-sation. Its power output is 50 to 120mW; the mechanical tuning bandwidth is 1000 to 1500 MHz, its maximum value is 2500MHz; the typical frequency temperature coefficient is less than 0.07MHz/℃, its minimum value is 0.01MHz/℃; and the typical power temperature coefficient is less than 0.015dB/℃, its minimum value is 0.007dB/℃.
The design principles and a practical circuit of a Ku-band broadband me-chanical tuning Gunn Oscillator is described The oscillator is stabilized by bimetal compen-sation. Its power output is 50 to 120mW; the mechanical tuning bandwidth is 1000 to 1500 MHz, its maximum value is 2500MHz; the typical frequency temperature coefficient is less than 0.07MHz/℃, its minimum value is 0.01MHz/℃; and the typical power temperature coefficient is less than 0.015dB/℃, its minimum value is 0.007dB/℃.
1991, 13(5): 502-508.
Abstract:
A new method for che constr truction of the symmetrical sequence of Snos neighbouring logic is proposed. And the realization problem of sole neighbouring logic path for N dimensions Boolean ordered set is solved too. The method of the search of bounce bound is given.
A new method for che constr truction of the symmetrical sequence of Snos neighbouring logic is proposed. And the realization problem of sole neighbouring logic path for N dimensions Boolean ordered set is solved too. The method of the search of bounce bound is given.
1991, 13(5): 509-515.
Abstract:
Recently, a new technique refered to as the on-surface radiation boundary condition (OSRC) approach was presented to calculatc the electromagnetic scattering by con-vex structures. When the scatterer is with first-order surface discontinuities, the OSRC obtained by this new technique is very inaccurate. Thus there are many limitations about the application of the OSRC approach. In this paper, the OSRC approach is modified, and a method to deal with the scattering by convex two-dimensional objects with arbitrary singular edges is presented. This method is applied to calculate monostatic and bistatic rader cros-section from convex scatterers with nonsmooth surfaces. The result shows that OSRC approach greatly improves the accuracy of the scattered field prediction .
Recently, a new technique refered to as the on-surface radiation boundary condition (OSRC) approach was presented to calculatc the electromagnetic scattering by con-vex structures. When the scatterer is with first-order surface discontinuities, the OSRC obtained by this new technique is very inaccurate. Thus there are many limitations about the application of the OSRC approach. In this paper, the OSRC approach is modified, and a method to deal with the scattering by convex two-dimensional objects with arbitrary singular edges is presented. This method is applied to calculate monostatic and bistatic rader cros-section from convex scatterers with nonsmooth surfaces. The result shows that OSRC approach greatly improves the accuracy of the scattered field prediction .
1991, 13(5): 516-523.
Abstract:
The linear boundary element method for electromagnetic fields is ta-ken to deal with the exitation of a non-symmetrical electric dipole in a lossv half space. A simple and practical algorithm is offered to the electromagnetic measu-rement while drilling (EM-MWD). The calculations on two models under the low frequency limits arc compared with the experiments and the results calculated with the theory of srationary currenr fields.
The linear boundary element method for electromagnetic fields is ta-ken to deal with the exitation of a non-symmetrical electric dipole in a lossv half space. A simple and practical algorithm is offered to the electromagnetic measu-rement while drilling (EM-MWD). The calculations on two models under the low frequency limits arc compared with the experiments and the results calculated with the theory of srationary currenr fields.
1991, 13(5): 524-527.
Abstract:
The backfire antenna is a kind of compact structure, high gain and lower sidelobe antenna, but its bandwidth is limited. In this paper, the experimental results of the radiation characteristics of a backfire antenna at the L-band are presented. It is shown that the characeristics of the remote sensing system can be improved greatly by using this kind of antenna.
The backfire antenna is a kind of compact structure, high gain and lower sidelobe antenna, but its bandwidth is limited. In this paper, the experimental results of the radiation characteristics of a backfire antenna at the L-band are presented. It is shown that the characeristics of the remote sensing system can be improved greatly by using this kind of antenna.
1991, 13(5): 528-531.
Abstract:
On the basis of authers developed data sampling and processing system, the 12GHz intensity scintillation of clear air turbulence has been observed and analysed at low elevation angle by tracing the sun. The experimental results are given and discussed. The con-clusions are obtained as follows: (1) Between 16 and 4, the lower the elevation angle, the larger the sciatillation intensity in clear air will be. Scintillation is most probably to appear two or three days after rain. (2) The frequency at flection point (ft) appears, in general, between 0.1Hz and 1Hz.
On the basis of authers developed data sampling and processing system, the 12GHz intensity scintillation of clear air turbulence has been observed and analysed at low elevation angle by tracing the sun. The experimental results are given and discussed. The con-clusions are obtained as follows: (1) Between 16 and 4, the lower the elevation angle, the larger the sciatillation intensity in clear air will be. Scintillation is most probably to appear two or three days after rain. (2) The frequency at flection point (ft) appears, in general, between 0.1Hz and 1Hz.
1991, 13(5): 532-537.
Abstract:
The formulas for optically conrrolled frequency tuning and resonance fre-quency of dielectric resonator (DR) are presented. The formulas can be applied to design the stacked DR with high frequency stability.
The formulas for optically conrrolled frequency tuning and resonance fre-quency of dielectric resonator (DR) are presented. The formulas can be applied to design the stacked DR with high frequency stability.
1991, 13(5): 538-543.
Abstract:
The two new methods presented in this paper is primarily concerned with a new procedure for computation of two sequences, both are scgmented. For long signal and long unit-impulse response filter (high-order filter), they will reduce the waiting time greatly, so that the fikered points will be quickly obtained and total operating time will be saved. Furthermore, they can also save the memory space. So the new methods have the ad-vantage of higher efficiency. Compared with using the traditional overlap-save method, the processing error due to cutting tail will no longer exist by using the new methods.
The two new methods presented in this paper is primarily concerned with a new procedure for computation of two sequences, both are scgmented. For long signal and long unit-impulse response filter (high-order filter), they will reduce the waiting time greatly, so that the fikered points will be quickly obtained and total operating time will be saved. Furthermore, they can also save the memory space. So the new methods have the ad-vantage of higher efficiency. Compared with using the traditional overlap-save method, the processing error due to cutting tail will no longer exist by using the new methods.
1991, 13(5): 544-547.
Abstract:
The principle and structure of the carrier recovery PLL of baseband digl-tal coherent demodulation are presented, and the performance of this PLL is analysed. Comparing with the four times frequency method under the same conditions, the signal to noise ratio of this PLL is 5-10dB higher. The experimenta! results show that the recovered carrier is stable.
The principle and structure of the carrier recovery PLL of baseband digl-tal coherent demodulation are presented, and the performance of this PLL is analysed. Comparing with the four times frequency method under the same conditions, the signal to noise ratio of this PLL is 5-10dB higher. The experimenta! results show that the recovered carrier is stable.
1991, 13(5): 548-551.
Abstract:
An efficient algorithm for generating all passive-edge complete k-trees in symbolic form for general linear active networks is presented. This algorkhm, which is based on Minty s method, processes the topological graph of an active network directly. It can solve he problem of sign evaluation, and can reduce the number of cancellation terms greatly. Finally, an example is given to show its applicarion in the analysis of linear active networks.
An efficient algorithm for generating all passive-edge complete k-trees in symbolic form for general linear active networks is presented. This algorkhm, which is based on Minty s method, processes the topological graph of an active network directly. It can solve he problem of sign evaluation, and can reduce the number of cancellation terms greatly. Finally, an example is given to show its applicarion in the analysis of linear active networks.
1991, 13(5): 552-555.
Abstract:
The design, constrution and experimental results of a new type of H01H0n , mode transducer which wall is gradually slotted are discribed. It is a wideband mode transducer. Its voltage standing wave ratio is less them 1.1; its conversion loss is less then 1dB, and its amplitutc of the unwanted mode (H01 ) is lower then 15dB
The design, constrution and experimental results of a new type of H01H0n , mode transducer which wall is gradually slotted are discribed. It is a wideband mode transducer. Its voltage standing wave ratio is less them 1.1; its conversion loss is less then 1dB, and its amplitutc of the unwanted mode (H01 ) is lower then 15dB
1991, 13(5): 556-560.
Abstract:
The mechanism cf intrinsc gettering (IG) effecr for Neutron Trans-mutation Doped Czochralski Silicon (NTDCZSI) differs from chat of Czochralski Silicon (CZSi), and it results from the interaction between irradition defets and in-terstitial oxygen. Annealing at 1100℃ for 4h, the intrinsic gettering of NTDCZSi can be performed.
The mechanism cf intrinsc gettering (IG) effecr for Neutron Trans-mutation Doped Czochralski Silicon (NTDCZSI) differs from chat of Czochralski Silicon (CZSi), and it results from the interaction between irradition defets and in-terstitial oxygen. Annealing at 1100℃ for 4h, the intrinsic gettering of NTDCZSi can be performed.
