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 <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small>-state gate–source voltage for large IB signals. We analyze the tradeoff between <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small>-state resistance and <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small>-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<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathbf {_{3}}$</tex-math> </inline-formula> at room temperature and over 14-dBm IIP<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathbf {_{3}}$</tex-math> </inline-formula> 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.