IEEE Microwave and Wireless Components Letters ( IF 2.374 ) Pub Date : 2020-02-11 , DOI: 10.1109/lmwc.2020.2967391
Xiaoyan Gui; Renjie Tang; Yanlong Zhang; Dan Li; Li Geng

A voltage-controlled oscillator (VCO) with VCO-gain ( $K_{\mathrm {VCO}}$ ) variation compensation is proposed to reduce $K_{\mathrm {VCO}}$ variation in a current-mode logic (CML) ring oscillator by introducing a cross-coupled pair with capacitive degeneration that mitigates the nonlinearity of $K_{\mathrm {VCO}}$ . Designed and fabricated in a standard 0.18- $\mu \text{m}$ CMOS process, the proposed VCO can be tuned from 1.78 to 2.53 GHz, with the VCO gain variation less than 14.01%, while occupying a core area of $0.185\times0.081$ mm 2 and consuming 20 mA including the bias circuitry, from a 1.8-V supply voltage. The phase noise is measured to be −92.68 dBc/Hz at 1 MHz offset and −114.97 dBc/Hz at 10 MHz offset from the high-band carrier frequency, respectively.

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