A 1-8 GHz, 190MHz BB BW Mixer-First Receiver With Bootstrapped Mixer Switches Achieving Over 16dBm In-Band IIP3

In this article, we propose a wideband mixer-first receiver with improved in-band (IB) linearity. It uses bootstrapped N-path mixer switches to achieve a constant on-state gate–source voltage for large IB signals. We analyze the tradeoff between on-state resistance and off-state subthreshold current in conventional mixer switches and introduce a method to break this tradeoff with the presented bootstrap technique. The mixer is followed by a degenerated LNTA featuring partial cancellation of its nonlinear output current. The receiver is fabricated in 22-nm FDSOI CMOS and achieves over 16-dBm IB IIP 3 at room temperature and over 14-dBm IIP 3 over the industrial temperature range. It has a 190-MHz I and Q baseband bandwidth, while its performance is demonstrated for a local oscillator frequency range from 1 to 8GHz.