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1992 Vol. 14, No. 6
Display Method:
1992, 14(6): 561-566.
Abstract:
An artificial delay line which was designed by using the DYL integrated linear AND-OR gate created first in China were proposed. This kind of delay circuit has not only the advantages of simpler structure, more rapid velocity for signal trasmission, but also the circuit delay which can be controlled by digital quantity.
An artificial delay line which was designed by using the DYL integrated linear AND-OR gate created first in China were proposed. This kind of delay circuit has not only the advantages of simpler structure, more rapid velocity for signal trasmission, but also the circuit delay which can be controlled by digital quantity.
1992, 14(6): 567-573.
Abstract:
The nonlinear equation modeling the 2-D cochlear mechanics is established,and an effective method-bias technique for computing this equation is presented. The modelshows many effects which correlate closely to physiological counterparts. The quantitative data on the level-dependence of frequency responses are given.
The nonlinear equation modeling the 2-D cochlear mechanics is established,and an effective method-bias technique for computing this equation is presented. The modelshows many effects which correlate closely to physiological counterparts. The quantitative data on the level-dependence of frequency responses are given.
1992, 14(6): 574-578.
Abstract:
The residual mechanical stress in SiO2 films results in the degradation of mobilities in MOSFETs. Based on the edge force approximation in SiO2 films, the stress field in MOS device is obtained. The results here are in agreement with those measured by the Raman spectrum method.
The residual mechanical stress in SiO2 films results in the degradation of mobilities in MOSFETs. Based on the edge force approximation in SiO2 films, the stress field in MOS device is obtained. The results here are in agreement with those measured by the Raman spectrum method.
1992, 14(6): 579-587.
Abstract:
A designing model of active matrix for liquid-crystal displays (LCDs) is developed. It consists of a total designing idea of active matrix, the characteristics of ac ive matrix devices and the physics of liquid crystal cell capacitance being charged or discharged. Some factors influencing the characteristics of active matrix are also considered. Based on the analysis, the calculating formulas for the design are deduced. Some proposals for optimizing the design of active matrix for LCDs are offered|.
A designing model of active matrix for liquid-crystal displays (LCDs) is developed. It consists of a total designing idea of active matrix, the characteristics of ac ive matrix devices and the physics of liquid crystal cell capacitance being charged or discharged. Some factors influencing the characteristics of active matrix are also considered. Based on the analysis, the calculating formulas for the design are deduced. Some proposals for optimizing the design of active matrix for LCDs are offered|.
1992, 14(6): 588-595.
Abstract:
Permutation polynomials in finite fields are initially introduced into the design of full frequency hop codes. Various kinds of full frequency hop codes with ideal au-to-and cross-ambiguity functions are presented in this paper. For example, the codes of class 2 are the best full frequency hop codes up to now.
Permutation polynomials in finite fields are initially introduced into the design of full frequency hop codes. Various kinds of full frequency hop codes with ideal au-to-and cross-ambiguity functions are presented in this paper. For example, the codes of class 2 are the best full frequency hop codes up to now.
1992, 14(6): 596-601.
Abstract:
Two new notions for coset partition of the dyadic additive goups are proposed, and their sufficient and necessary cond itions are also given. On the basis of these works, the feasibility problem of implementing minority-logic decoding algorithm for RM codes is solved.
Two new notions for coset partition of the dyadic additive goups are proposed, and their sufficient and necessary cond itions are also given. On the basis of these works, the feasibility problem of implementing minority-logic decoding algorithm for RM codes is solved.
1992, 14(6): 602-610.
Abstract:
An isomorphism preserving Hamming weight between two algebraic geometry (AG) codes is presented to obtain the main parameters of Justesen s algebraic geometry (JAG) codes. To deduce a simple approach to the decoding algorithm, a code word in a small JAG code is used to correspond to error-locator polynomial. By this means, a simple decoding procedure and the ability of error correcting are explored obviously. The low and up bounds of the dimension of AG codes are also obtained.
An isomorphism preserving Hamming weight between two algebraic geometry (AG) codes is presented to obtain the main parameters of Justesen s algebraic geometry (JAG) codes. To deduce a simple approach to the decoding algorithm, a code word in a small JAG code is used to correspond to error-locator polynomial. By this means, a simple decoding procedure and the ability of error correcting are explored obviously. The low and up bounds of the dimension of AG codes are also obtained.
1992, 14(6): 611-617.
Abstract:
Two kinds of statistical regression methods are presented for S-parameter measurements, without changing ports of reciprocal multi-port networks. The methods arc named progressively regression theory and generalized Kajfez method Mesurement data done with a H-plane Tee and processed results are also presented.
Two kinds of statistical regression methods are presented for S-parameter measurements, without changing ports of reciprocal multi-port networks. The methods arc named progressively regression theory and generalized Kajfez method Mesurement data done with a H-plane Tee and processed results are also presented.
1992, 14(6): 618-623.
Abstract:
A new type of absorbing coaing which is formed by inserting a frequency selective surface in an ordinary coating, is introduced. The absorbing properties of the new coating are given and compared with those of the ordinary absorbing coating.
A new type of absorbing coaing which is formed by inserting a frequency selective surface in an ordinary coating, is introduced. The absorbing properties of the new coating are given and compared with those of the ordinary absorbing coating.
1992, 14(6): 624-628.
Abstract:
A new optimization technique which combines one dimension exploration with stochastic approximation is presented. A quadratic model is used to approximate the response of a circuit over a parameter space. The circuit yield for different design center values is estimated using correlated sampling and quadratic model via Monte Carlo method. An example shows that the convergence of this approach is faster and required CPU-time is less.
A new optimization technique which combines one dimension exploration with stochastic approximation is presented. A quadratic model is used to approximate the response of a circuit over a parameter space. The circuit yield for different design center values is estimated using correlated sampling and quadratic model via Monte Carlo method. An example shows that the convergence of this approach is faster and required CPU-time is less.
1992, 14(6): 629-632.
Abstract:
A novel Ku-band low noise amplifier with high electron mobility transis-ror (HEMT) and GaAs monolithic microwave integrated circuit (MMIC) has been demonstrated. Its noise figure is less than 1.9dB with an associated gain over 27dB and an input-output VSWR less than 1.4 in the frequency range of 11.7-12.2 GHz. The HEMT and the microwave series inductance feedback technique arc used in the first stage of the amplifier, and the Ku-band MMIC is used in the last stage. The key to this design is to achieve a simultaneous optimum noise match and a minimum input VSWR match by using the microwave series inductance feedback method. The BJ-120 waveguides are used in both input and output of the amplifier.
A novel Ku-band low noise amplifier with high electron mobility transis-ror (HEMT) and GaAs monolithic microwave integrated circuit (MMIC) has been demonstrated. Its noise figure is less than 1.9dB with an associated gain over 27dB and an input-output VSWR less than 1.4 in the frequency range of 11.7-12.2 GHz. The HEMT and the microwave series inductance feedback technique arc used in the first stage of the amplifier, and the Ku-band MMIC is used in the last stage. The key to this design is to achieve a simultaneous optimum noise match and a minimum input VSWR match by using the microwave series inductance feedback method. The BJ-120 waveguides are used in both input and output of the amplifier.
1992, 14(6): 633-638.
Abstract:
A new analogue sampled-data active device, called as a switched-current operational amplifier (SIOA), is presented. The use of the active element may simplify drawing the circuit diagram greatly and may permit easier analysis and synthesis of SI networks. A number of all pole and elliptic (second or third order) switched current (SI) circuits are derived from the switched capacitor prototypes. These can be used as simple self-contained filters or as filter sections in the cascade realizations of a higher order transfer functions. To illustrate the design approach, a fifth-order lowpass filter is presented.
A new analogue sampled-data active device, called as a switched-current operational amplifier (SIOA), is presented. The use of the active element may simplify drawing the circuit diagram greatly and may permit easier analysis and synthesis of SI networks. A number of all pole and elliptic (second or third order) switched current (SI) circuits are derived from the switched capacitor prototypes. These can be used as simple self-contained filters or as filter sections in the cascade realizations of a higher order transfer functions. To illustrate the design approach, a fifth-order lowpass filter is presented.
1992, 14(6): 643-647.
Abstract:
The 2-D EM boundary value problems with curved boundaries are first treated by the method of lines based on the matrix Theory. The method presented here has following advantages generality, high accuracy and small computations.
The 2-D EM boundary value problems with curved boundaries are first treated by the method of lines based on the matrix Theory. The method presented here has following advantages generality, high accuracy and small computations.
1992, 14(6): 648-651.
Abstract:
The boundary-element method is proposed to investigate the higher-order mode cut-off frequencies in TEM cells. Both TE and TM modes are considered. For symmetry, only one quarter of the cross-section is analyzed, and electric aad magnetic walls are employed in the cross-section. With this method, mode identification can easily be made by using an eigenvector solution. The obtained results are compared with data available in literatures.
The boundary-element method is proposed to investigate the higher-order mode cut-off frequencies in TEM cells. Both TE and TM modes are considered. For symmetry, only one quarter of the cross-section is analyzed, and electric aad magnetic walls are employed in the cross-section. With this method, mode identification can easily be made by using an eigenvector solution. The obtained results are compared with data available in literatures.
1992, 14(6): 652-656.
Abstract:
The EM scattering by rectangular conducting flat plate coated with lossy dielectric, whose parameters may be arbitrary, is studied To avoid the complex integral, Ma-liuzhinets functions involved are approximated with close-form analytical expressions so that the computing time is reduced greatly. The results in the paper are in fair agreement with the experimental ones.
The EM scattering by rectangular conducting flat plate coated with lossy dielectric, whose parameters may be arbitrary, is studied To avoid the complex integral, Ma-liuzhinets functions involved are approximated with close-form analytical expressions so that the computing time is reduced greatly. The results in the paper are in fair agreement with the experimental ones.
1992, 14(6): 657-660.
Abstract:
The variation equation and numerical result for the cut-off wavelength of the truncated circular waveguide are given byusing the variational principle and Rayleigh-Ritz variational technique, and choosing a proper ba se function. A good performance circular-rectangular waveguide staircase transition device is designed.
The variation equation and numerical result for the cut-off wavelength of the truncated circular waveguide are given byusing the variational principle and Rayleigh-Ritz variational technique, and choosing a proper ba se function. A good performance circular-rectangular waveguide staircase transition device is designed.
1992, 14(6): 661-665.
Abstract:
The XPS, AES and EP have been used to study the elemental depth-distributions of secondary eletron emission layer of lead silicate glass reduced by hydrogen. The samples treated at different temperatures have differences in their micro-structures. The effects of different reduced temperature have been discussed, and new model of the layer of secondary electron emitter has been suggested
The XPS, AES and EP have been used to study the elemental depth-distributions of secondary eletron emission layer of lead silicate glass reduced by hydrogen. The samples treated at different temperatures have differences in their micro-structures. The effects of different reduced temperature have been discussed, and new model of the layer of secondary electron emitter has been suggested
1992, 14(6): 639-642.
Abstract:
The set GIT (2) of all gyrators and ideal transformers is studied by the method of group theory in this paper. The results show that the set GIT (2) forms a group, and it is a subgroup of GL(2). The inner structure of GIT (2), which shows the relations between gyrators and ideal transformers, is also studied. Finally, the properties of the direct productnetwork of two-port network is analysed.
The set GIT (2) of all gyrators and ideal transformers is studied by the method of group theory in this paper. The results show that the set GIT (2) forms a group, and it is a subgroup of GL(2). The inner structure of GIT (2), which shows the relations between gyrators and ideal transformers, is also studied. Finally, the properties of the direct productnetwork of two-port network is analysed.
