A 550MHz-B and width 40dB-Gain Range Analog Baseband with Dynamic PVT Compensation Achieving 26.1 dBm OIP3 in 28-nm CMOS

This paper presents a PVT-robust, high gain range and high linearity analog baseband (ABB) circuit for wideband communication. The ABB circuit consists of a four-stage programmable gain amplifier (PGA) and an embedded second-order low pass filter (LPF). In order to satisfy the PVT variations, a novel PGA topology based on two-stage miller OTA with self PVT compensation and dynamic pole-capturing technique is proposed. Besides, the ABB circuit uses floating-bulk bias method to achieve high linearity. Fabricated in 28-nm CMOS process, the measurement results show that the ABB circuit can provide a programmable gain range from 0 to 40 dB with 6 dB coarse and 1 dB fine step, while the 3 dB bandwidth greater than 550 MHz. It obtains an OP<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1dB</inf> of 5dBm and OIP3 of 26.1dBm for the maximum gain state. The ABB circuit occupies a core area of 0.23 mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and consumes a DC power consumption of 15 mW from 0.9-V supply.