Abstract
A 4.03 GHz-4.97 GHz quadrature voltage-controlled oscillator (QVCO) with back-gate coupling and VCO gain (K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VCO</sub> ) linearization techniques implemented in 0.35 ¿m SiGe BiCMOS process technology is presented. The back-gate coupling is adopted to improve the phase noise and to reduce the power consumption, and a voltage-level-shift circuit is used to linearize the VCO gain. The core circuit draws a 5.65 mA current from 3.0 V power supply. The measured phase noise at 1 MHz frequency offset is -102.76 dBc/Hz. And the measured K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VCO</sub> is from 456 MHz/V to 744 MHz/V with a K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VCO</sub> ratio of 1.63.
Published Version
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