Title :
A linear transconductance amplifier obtained by realizing a floating resistor
Author_Institution :
NEC Corp., Yokohama, Japan
fDate :
1/1/1998 12:00:00 AM
Abstract :
A novel circuit-design technique for bipolar and CMOS linear transconductance amplifiers is presented. The proposed linear transconductance amplifier consists of a differential pair of constant-current-biased transistors with a degeneration resistor and emitter- or source-followed-augmented current mirrors. The fundamental characteristics of the bipolar linear transconductance amplifier at a 1.9 V supply voltage are verified using bipolar transistor arrays and discrete resistors. The obtained linear input-voltage range is 320 mV r.m.s. (=0.905 Vp-p for less than 1% total harmonic distortion (THD) or 285 mV r.m.s. (=0.806 Vp-p for less than 0.1% THD when the input frequency is 1 kHz
Keywords :
CMOS analogue integrated circuits; bipolar analogue integrated circuits; differential amplifiers; harmonic distortion; operational amplifiers; 1.9 V; 285 to 320 mV; CMOS amplifier; OTA; bipolar amplifier; bipolar transistor arrays; circuit-design technique; constant-current-biased transistors; current mirrors; degeneration resistor; differential pair; floating resistor; linear transconductance amplifier; DC-DC power converters; Equations; Inductors; Open loop systems; Power system modeling; Resistors; Steady-state; Switching converters; Transconductance; Transfer functions;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
