A 1-V low-power 2.4GHz fractional-N frequency synthesizer with sigma-delta modulator controller for Bluetooth applications is implemented in 0.18 μm CMOS technology. A novel structure dual-modulus divide-by-128/129 prescaler using dynamic D-flip-flop is proposed and the operating clock frequency can reach as high as 2.6 GHz at 1-V supply voltage. Moreover, a third-order feedforward sigmadelta modulator (SDM) is employed as a modulus controller to achieve an appropriate division ratio and suppress the fractional spurs. The simulation results show the synthesizer possesses the tuning range of 2.136 to 2.53 GHz and a phase noise of -126.85 dBc/Hz at 1MHz offset. Moreover, the core area without the SDM and the loop filter is 0.85 mm2, and the total power consumption is 8.94 mW.
|Number of pages||4|
|Journal||Proceedings - IEEE International Symposium on Circuits and Systems|
|Publication status||Published - 2005|
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering