Author/Authors :
Yaohui, KONG Ministry of Public Security - First Research Institute, China , Hong, YANG Ministry of Public Security - First Research Institute, China , Ming, JIANG Ministry of Public Security - First Research Institute, China , Shuzheng, XU Tsinghua University - Department of Electronic Engineering, China , Huazhong, YANG Tsinghua University - Department of Electronic Engineering, China
Abstract :
A CMOS triode transconductor was developed with common mode feedback suitable for operating in low-voltage and low-power applications. The design is based on a body-driven input stage with feedback loops to extend both the signal input range and the tuning capability. The effective transconductance of the body-driven triode stage is increased using a partial positive feedback technique which also partially solves the problem introduced by the small transconductance. This design uses the UMC 0.18 urn CMOS process. Simulations show the transconductor operated with 1 V supply voltage has less than -55 dB total harmonic distortions (THD) in the complete tuning range (0 VsJ Vcont^0.43 V) for a 1 MHz 0.8 Vp.p differential input. The power consumption is 70 ^Wfor a 0.43 V control voltage.
Keywords :
low , voltage , CMOS , transconductor , wide input range
