A CMOS OTA for HF filters with programmable transfer function

A CMOS OTA for HF filters with programmable transfer function

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 degrees for frequencies up to more than one tenth of the OTA bandwidth. The OTA has built-in phase compensation,...

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Veröffentlicht in:IEEE journal of solid-state circuits 1991-11, Vol.26 (11), p.1720-1723
Hauptverfasser: van der Zwan, E.J., Klumperink, E.A.M., Seevinck, E.
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Bandwidth
Electronics
Error correction
Exact sciences and technology
Frequency
Hafnium
Integrated circuits
Integrated circuits by function (including memories and processors)
Laboratories
Low pass filters
Poles and zeros
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Transconductance
Transfer functions
Voltage
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Zusammenfassung: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 degrees 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 (G/sub m/) while maintaining a small phase error. Since this phase error is preserved over the G/sub m/ 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.< >
ISSN:0018-9200
1558-173X
DOI:10.1109/4.98994