Abstract
This paper presents a new tail current-shaping technique to improve the phase noise of an LC quadrature VCO (LC-QVCO) based on Gaussian pulse generator (GPG). The GPG makes a narrow pulse from oscillator sinusoidal output and injects it back to gates of tail transistors to reduce the root-mean-square (RMS) value of impulse sensitivity function (ISF) and to improve phase noise. It will be shown that by utilizing a GPG, total phase noise improvement will be as high as 6[Formula: see text]dB. The proposed circuit was designed and simulated by ADS simulator using 0.18[Formula: see text][Formula: see text]m TSMC RF CMOS design kit. The phase noise's at 3[Formula: see text]MHz frequency offset and carrier frequencies of 2.43[Formula: see text]GHz and 2.6[Formula: see text]GHz are –141[Formula: see text]dBc/Hz and –135[Formula: see text]dBc/Hz, respectively, while the total power consumption is 14[Formula: see text]mW under 1.8[Formula: see text]V supply voltage. Tuning range is from 2.43[Formula: see text]GHz to 2.6[Formula: see text]GHz. The figure of merit (FOM) values for the proposed LC-QVCO at 3[Formula: see text]MHz frequency offset are –187.6[Formula: see text]dBc/Hz and –182.3[Formula: see text]dBc/Hz for 2.43[Formula: see text]GHz and 2.6[Formula: see text]GHz carrier frequencies, respectively.
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