2000 Volume 120 Issue 10 Pages 1358-1364
An OTA is one of useful analog circuit blocks. In order to obtain a linear characteristic of OTA's transconductance, two MOSFET's operated in the linear region are used as input devices. The linearity of the OTA is achieved by fixing a drain-to-source voltage of the MOSFET's. A Current Transfer Voltage Regulated circuit (CTVR) is utilized to fix the drain-to-source voltage. An OTA using the CTVR realizes linear characteristic. The conventional CTVR has a problem of voltage error between the Gate-to-Sourse voltage of nMOSFET and pMOSFET In this paper, Low-Voltage OTA's are proposed. The proposed circuits use the CTVR without influence of voltage setting error. The proposed circuits are simulated by PSpice to confirm their performance.
The transactions of the Institute of Electrical Engineers of Japan.C
The Journal of the Institute of Electrical Engineers of Japan