A VCO phase noise reduction technique to suppress the active device contribution

Men, Kai; Thangarasu, Bharatha Kumar; Yeo, Kiat Seng

doi:10.1109/inec.2016.7589433

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…This leads to shorter commutation time while achieving a lower effective noise factor. To circumvent the harmonics, Men et al [11] biased the tail current source transistor at 2f LO to suppress the cyclostationary noise via accumulation and strong inversion pattern.…”

Section: Introductionmentioning

confidence: 99%

A 2.2 to 2.9 GHz Complementary Class-C VCO With PMOS Tail-Current Source Feedback Achieving – 120 dBc/Hz Phase Noise at 1 MHz Offset

2019

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The performance of low-powered transceivers is required to meet stringent specifications for an advanced wireless radio application. It is critical for a voltage-controlled oscillator (VCO) to meet multi-standard and multiple frequency operation with low-power consumption and amplitude enhanced complementary mode of operation. This paper proposes a novel technique for wide tuning range in a complementary class-C VCO employing a capacitive-source degeneration (CSD) to meet multi-standard operation for low-power transceivers. The technique that employs two sets of symmetrical split PMOS biased current source operating in the subthreshold region achieves the desired low phase noise (PN) performance at a tuning range of 2.2-2.9 GHz with a supply headroom of 1.2 V. The control of the dc bias point reduces the conduction angle, which improves the current efficiency, power consumption, and PN. Concurrently, an auxiliary −g m NMOS only class-B oscillator is incorporated to mitigate the start-up issue of the class-C VCO. At the center frequency of 2.45 GHz, the proposed VCO achieves a power consumption of 1.73 mW, phase noise of −120 dBc/Hz at the 1-MHz offset, and a figure-of-merit (FoM) of 185.41 dBc/Hz at 1 MHz. The total active chip area is only 0.3-mm 2 excluding bond pads. The proposed VCO serves as a promising solution for low-power wireless communication systems.

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Section: Introductionmentioning

confidence: 99%