A low-noise wide range delta-sigma frequency synthesizer for DTV broadband

Abstract

The proposed low noise wide frequency range Phase Loco Loop (PLL) proposed in TSMC O.18-um CMOS technology is developed for DTV broadband. It incorporates a Extended Multi-band Ring Voltage Control Oscillator (VCO) to enhance the frequency selection range of the conventional Multi-band Ring VCO accomplishing a wide frequency range and better phase noise PLL. This frequency synthesizer is measured the phase noise of -97.1 dBclHz at 3MHz offset frequency and reference spurs below -69.78dBc at 36MHz offset. The VCO gain Kyco (73MHzJV� 328MHzJV) is improved by using the Extended Multi-band Ring VCO obtaining a better phase noise performance than the conventional Multi-band Ring VCO structure.