TY - GEN
T1 - A gate-modulated CMOS LC quadrature VCO
AU - Cheng, Kuang-Wei
AU - Allstot, David J.
PY - 2009/10/27
Y1 - 2009/10/27
N2 - A quadrature voltage-controlled oscillator (QVCO) based on the time-varying gate-modulated coupling of two LC tank VCOs is introduced. Using a standard 0.18μm CMOS process, the new topology is compared to the conventional series QVCO in terms of start-up loop gain, quadrature phase accuracy, phase noise, tuning range, and voltage headroom characteristics. In addition to comparable phase noise performance, the gate-modulated QVCO (GM-QVCO) also exhibits superior quadrature phase accuracy, and suitability for low power supply voltage designs that use cascode current sources and active loads. It draws 2.4 mA from a 1.8 V power supply, displays a phase noise of -122 dBc/Hz @ 1MHz offset, and has a quadrature phase error of 0.4°.
AB - A quadrature voltage-controlled oscillator (QVCO) based on the time-varying gate-modulated coupling of two LC tank VCOs is introduced. Using a standard 0.18μm CMOS process, the new topology is compared to the conventional series QVCO in terms of start-up loop gain, quadrature phase accuracy, phase noise, tuning range, and voltage headroom characteristics. In addition to comparable phase noise performance, the gate-modulated QVCO (GM-QVCO) also exhibits superior quadrature phase accuracy, and suitability for low power supply voltage designs that use cascode current sources and active loads. It draws 2.4 mA from a 1.8 V power supply, displays a phase noise of -122 dBc/Hz @ 1MHz offset, and has a quadrature phase error of 0.4°.
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U2 - 10.1109/RFIC.2009.5135537
DO - 10.1109/RFIC.2009.5135537
M3 - Conference contribution
AN - SCOPUS:70350215764
SN - 9781424433780
T3 - Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
SP - 267
EP - 270
BT - Proceedings of the 2009 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2009
T2 - 2009 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2009
Y2 - 7 June 2009 through 9 June 2009
ER -