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| ANALOGUE INDUCTOR AND LOW-LOSS CAPACITY MULTIPLIER COMPOSED OF COMPLEMENT ARY COMPOSITE FOLLOWER |
| Zhang Pengxiang; Shao Qianfen |
| Wuhan Institute of Physics Academia Sinica |
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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 ω, 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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Received: 20 July 1985
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1986, Vol. 8 
