A 1.5-V 4-GHz dynamic-loading regenerative frequency doubler in a 0.35-(mu)m CMOS process

This paper proposes a new topology of a frequency doubler using a dynamic-loading technique to achieve higher operating frequency, larger output swing, larger bandwidth and lower phase noise compared to traditional designs. Implemented in a standard 0.35-(mu)m digital CMOS process and at a 1.5-V supply, the proposed frequency doubler measures a maximum operating output frequency of 4 GHz with a bandwidth of 2.4 GHz while consuming a power of 3.7 mW. The single-ended output amplitude ranges from -3.0 to -6.5 dBm, and the phase noise is as low as -111 dBc/Hz at 500-kHz offset.