Title :
A CMOS OTA for HF filters with programmable transfer function
Author :
Van Der Zwan, Eric J. ; Klumperink, Eric A M ; Seevinck, Evert
Author_Institution :
MESA Res. Inst., Twente Univ., Enschede, Netherlands
fDate :
11/1/1991 12:00:00 AM
Abstract :
A CMOS operational transconductance amplifier (OTA) for programmable HF filters is presented. When used in an OTA-C integrator, the unity-gain frequency phase error remains less than 0.3° for frequencies up to more than one tenth of the OTA bandwidth. The OTA has built-in phase compensation, which allows tuning of the transconductance of the OTA (Gm) while maintaining a small phase error. Since this phase error is preserved over the Gm range of the OTA, the OTA is suitable for filters with a programmable transfer function. Using stacked square-law transistors improves the linearity, DC-gain, and power-consumption properties of the OTA
Keywords :
CMOS integrated circuits; active filters; high-frequency amplifiers; operational amplifiers; CMOS; DC-gain; HF filters; OTA; OTA-C integrator; bandwidth; built-in phase compensation; linearity; operational transconductance amplifier; power-consumption; programmable HF filters; programmable transfer function; small phase error; stacked square-law transistors; unity-gain frequency phase error; Bandwidth; Error correction; Frequency; Hafnium; Laboratories; Low pass filters; Poles and zeros; Transconductance; Transfer functions; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
