Low-voltage and low-power OTA using source-degeneration technique and its application in Gm-C filter

Abstract

A new high performance OTA circuit using source degeneration technique and a flipped-voltage follower current mirror is presented. Source-degeneration techniques improve the bias current of the input differential pair when large signals are applied, thus, increasing circuit dynamic characteristics. The OTA is implemented in Tower Jazz 0.18µm TS18SL technology under a ± 0.9V supply voltage. Simulation results show that the OTA achieves a wide differential input range, a good Gm tenability and a low power consumption of 1.2µW. A first order Gm-C filter based on the proposed OTA is designed and simulation results are presented and commented.