Low phase noise buffer‐reused BiCMOS oscillator

Abstract

AbstractThis letter presents a lower phase noise voltage‐controlled oscillator (VCO) uses two differential amplifiers in cross‐coupled feedback and is named as a buffer‐reused VCO in the TSMC standard 0.18 μm SiGe BiCMOS processes. The die area is 1.1 × 1.2 mm2. The first amplifier uses HBT stacking on nMOSFET and the second amplifier uses nMOS amplifier. Its power consumption of 2.65 mW with output buffer current, the phase noise is −128.81 dBc/Hz at 1 MHz offset frequency from the center frequency 4.19 GHz. The figure of merit (FOM) is −194.08 dBc/Hz.