Title :
A CMOS OTA with improved linearity based on current addition
Author :
Wu, Pan ; Schaumann, Rolf ; Szczepansk, Stanislaw
Author_Institution :
Dept. of Electr. & Comput. Eng., Portland State Univ., OR, USA
Abstract :
Current addition, an approach to the design of linear transconductance elements with a very large linear input range, is explored. Design tradeoffs are discussed and a specific circuit is simulated by SPICE as an example. The results show that for a power supply of ±5 V, the nonlinearity error of the sample circuit is controlled to ±0.3% over a ±3-V input range. OTA (operational transconductance amplifier) parameters such as tuning capability, frequency response, and output impedance are examined. The body effect is considered. A second-order filter is presented as an application
Keywords :
CMOS integrated circuits; differential amplifiers; electric impedance; frequency response; linear integrated circuits; linear network synthesis; operational amplifiers; tuning; CMOS OTA; SPICE; body effect; current addition; frequency response; linear transconductance elements; operational transconductance amplifier; output impedance; second-order filter; tuning capability; Circuit optimization; Circuit simulation; Error correction; Frequency response; Linearity; Operational amplifiers; Power supplies; SPICE; Transconductance; Tuning;
Conference_Titel :
Circuits and Systems, 1990., IEEE International Symposium on
Conference_Location :
New Orleans, LA
DOI :
10.1109/ISCAS.1990.112468
