Analogue inductor and low-loss capacity multiplier composed of complementary composite follower

Abstract

A new kind of highQ (quality factor) analogue inductor (L=50H,Q=98.8) and low-loss (loss resistanceR _e ,R _e may approach zero, i. e.Q→∞ capacity multiplier composed of complementary composite follower using field effect and bipolar 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 betweenQ and ω,Q andr (complementary resistance),R _e andr are established. The design of this kind of device is also discussed and verified experimentally. Moreover the expression for the sensitivity of theQ value of the analogue inductor is derived.