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A 19GHz frequency-modulated continuous-wave TX based on a bandpass ΔΣ DDFS-driven RF frequency synthesizer is presented. Implemented in a 0.25μm SiGe process, the synthesizer draws 63mA from a 2.5V supply while achieving a 512MHz FM deviation with a 200Hz FM rate at a center frequency of 19GHz. The measured phase noise of the frequency synthesizer is -113.68dBc/Hz at 1MHz offset frequency from a 19GHz...
Frequency synthesizers are fundamental building blocks in radio frequency, communications, and analog signal processing for generating high accuracy oscillatory signals. In general, the frequency synthesizer is the most sensitive block in the system since many of the signal processing elements such as clock, filters, and up/down converters depend on the synthesizer generating a clean sinusoidal signal...
A fully integrated 0.13-mum CMOS RFIC PLL transmitter for GFSK/GMSK modulation at 2.4-GHz ISM band is presented. A bandpass SigmaDelta direct digital frequency synthesized (BPSADDFS) reference oscillator is developed to provide a wideband RF PLL with a frequency modulated signal. The RF PLL-transmitter uses a single-bit bandpass SigmaDelta modulated injection locked oscillator as a reference signal...
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