摘要:
本文提出了一种用场效应晶体管和双极型晶体管的互补型复合跟随器构成高Q模拟电感电路和低耗电容倍增器的新方案。这种电感电路和电容倍增器与以往的相比,它们具有电路简单、只用一组电源、温度特性可以互补、适于制作低频段的高感值电感电路和低耗电容倍增器(由于复合跟随器输入阻抗高)等优点。文中分析了这种模拟电感电路和低耗电容倍增器的工作原理;找出了模拟电感电路的Q与(角频率)、Q与r(补偿电阻);电容倍增器的Q与r、(电容倍增系数)与r、Re(损耗电阻)与r的关系;同时还介绍了这种模拟电感电路和电容倍增器的设计方法;并进行了实验验证。最后,导出了这种模拟电感电路的Q值灵敏度的表达式,给出了这种模拟电感电路应用的例子。
Abstract:
A new kind of high Q (quality factor) analogue inductor (L=50 H, Q=98.8) and lowloss (loss resistance Re may approach zero, i.e, Q) capacity multiplier composed of complementary composite follower using field effect and dipolar transistors is proposed.As compared with the analogue inductor and capacity multiplier composed of integrated operational amplifier, the new device has the following features: its circuit is simple, with only one set of supply, more suitable for low frequency large inductor and capacity multiplier, and has complementary temperature characteristics. The working principle of this kind of analogue inductor and capacity multiplier is analysed and the relations between Q and , Q and r (complementary resistance), Re and r are estabilshed. The design of this kind of device is also discussed and verified experimentally, Besides, the expression for the sensitivity of the Q value of the analogue inductor is derived.
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