A Wide-Band Feedback Amplifier based on A New Operational Current Amplifier in 130nm CMOS

摘要

Two main topologies of feedback amplifiers are analyzed in detail in this paper. One is based on operational transconductance amplifier, but is limited in bandwidth. The other one is based on operational current amplifier, and can achieve wide bandwidth. In order to implement a wide-band feedback amplifier in a 130 nm CMOS with 1.2 V supply, a novel operational current amplifier with reasonable CMRR and wide output swing is proposed. This feedback amplifier draws 2.1 mA from 1.2 V supply while obtain 160 MHz bandwidth and 20.4 dBm IIP3 at 14-dB gain setting. The CMRR is 79 dB within 100 kHz, and is 20 dB within 2.5 GHz.