Title :
A large-signal very low-distortion transconductor for high-frequency continuous-time filters
Author :
Silva-Martinez, José ; Steyaert, Michel S J ; Sansen, Willy M C
Author_Institution :
Dept. of Elektrotech., Katholieke Univ. Leuven, Heverlee, Belgium
fDate :
7/1/1991 12:00:00 AM
Abstract :
A high-frequency large-signal very low-distortion voltage-to-current transducer is presented. The total harmonic distortion (THD), for supply voltages of only ±2.5 V, is smaller than 0.1% for fully differential input signals up to 2.4 V peak to peak (Vpp). The dynamic range is on the order of 89 dB with the transconductor noise integrated over a bandwidth of 1 MHz. Moreover, this structure presents low sensitivity to transistor mismatches. An operational transconductance amplifier (OTA), based on this transconductor, has been used in an adjustable quality factor 1.8-MHz biquadratic continuous-time filter. The quality factor Q is controlled, from 2 to 50, with a novel current-source configuration. Both the OTA and the filter have been fabricated in a CMOS 3-μm n-well process
Keywords :
CMOS integrated circuits; active filters; active networks; convertors; linear integrated circuits; operational amplifiers; -2.5 V; 1 MHz; 1.8 MHz; 2.5 V; 3 micron; CMOS; HF biquadratic filter; OTA; THD; adjustable quality factor; continuous-time filters; fully differential input signals; high-frequency; low-distortion transconductor; n-well process; operational transconductance amplifier; total harmonic distortion; voltage-to-current transducer; Bandwidth; Dynamic range; Filters; Operational amplifiers; Q factor; Total harmonic distortion; Transconductance; Transconductors; Transducers; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
