522 / 2019-03-06 17:59:09

A 10GHz Class-C Digitally-Controlled Oscillator with Fast Start-up Dynamic Biasing

low phase noise,Class-C,low phase noise,start-up,dynamic-bias,digitally-controlled oscillator (DCO)

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A 10GHz class-C digitally-controlled oscillator (DCO) with fast start-up dynamic biasing is proposed. A feedback loop is used to detects the voltage of output common mode and control cross-couple pair from class-B to class-C operation. Moreover, the bias scheme uses a switching RC filter for fast start-up and low noise output. The proposed DCO is designed in 55 nm CMOS process, achieves a start-up time of 36 ns and a phase noise of -106.3dBc/Hz at 1MHz offset. DCO operates from 9.6 GHz to 10.5 GHz, while consuming 7.3mW from a 1.2V supply.