A LV/ LP Modified OTA Using FGMOS Inverters with Its Application to Gm -C Filters

his paper presents a low-voltage (LV) (1.0 V) and low-power (LP) (40 µW) inverter based operational transconductance amplifier (OTA) using FGMOS (Floating-Gate MOS) transistor and its application in G m -C filters. The OTA was designed in a 0.18 µm CMOS process. The simulation results of the proposed OTA demonstrate an open loop gain of 30.2 dB and a unity gain frequency of 942 MHz. In this OTA, the relative tuning range of 50 is achieved. To demonstrate the use of the proposed OTA in practical circuits, the second-order Gm-C filter was designed. The designed filter has a good tuning range from 100 kHz to 5.6 MHz which is suitable for the wireless specifications of Bluetooth (650 kHz), CDMA2000 (700 kHz) and Wideband CDMA (2.2 MHz). The active area occupied by the designed filter on the silicon is 192umx535um and the maximum power consumption of this filter is 160 µW.

Low-Voltage and Low-Power (LV/LP), OTA, FGMOS, G m -C Filter, Inverter