A Pitch-Matched Low-Noise Analog Front-End With Accurate Continuous Time-Gain Co

Abstract

This article presents a compact analog front-end (AFE) circuit for ultrasound receivers with linear-in-dB contin- uous gain control for time-gain compensation (TGC). The AFE consists of two variable-gain stages, both of which employ a novel complementary current-steering network (CCSN) as the interpolator to realize continuously variable gain. The first stage is a trans-impedance amplifier (TIA) with a hardware-sharing inverter-based input stage to save power and area. The TIA’s output couples cap