With the rapid evolution of wireless communication technology, integrating various communication modes in a mobile terminal has become the popular trend. Because of this, multi-standard wireless technology is one of t...
Project supported by the Major State Basic Research Development Program of China (No.2010CB327403);the National Natural Science Foundation of China (No.61102027);the Natural Science Foundation of Zhejiang Province,China (No.Y1110991)
A wideband fractional-N frequency synthesizer is implemented in a 65 nm CMOS process.It employs a wideband LC voltage-controlled oscillator(VCO) with optimized VCO gain(KVCO/and a sub-band step to improve automatic...
the National Natural Science Foundation of China (No. 60025101, No.90207001, and No. 90307016).
This paper investigates the design of digital Sigma-Delta Modulator (SDM) for fractional-N frequency synthesizer. Characteristics of SDMs are compared through theory analysis and simulation. The curve of maximum-loop-...
A new Sigma-delta modulator (SDM) for Radio frequency (RF) fractional-N frequency synthesizer is proposed with a new dither generating method and a dither feedback loop. In this structure, the output of the conven...
A CMOS fully-differential 2.4GHz ∑-△ frequency synthesizer for Gaussian minimum shift keying (GMSK)modulation is presented. A pre-compensation fractional-N phase-locked loop(PLL)is adopted in the modulator.The t...
This paper presents the design considerations and implementation of a novel topology digital multistage-noise-shaping (MASH) delta-sigma modulator suitable for fractional-N phase-locked-loop (PLL) frequency synthe...
A digital phase-locked loop (DPLL) based on a new digital phase-frequency detector is presented. The self-calibration technique is employed to acquire wide lock range,low jitter, and fast acquisition. The DPLL works...