New high-speed double cross-coupled ICO/VCO

Popov, A.; Tchamov, N.T.; Jarske, P.

doi:10.1109/icecs.1996.582788

Cited by 2 publications

(1 citation statement)

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“…Summary of schematic simulation results for the full system Performance comparison of wideband Voltage-Controlled Oscillators ReferencesFig 16. Total phase noise at the output of the subsystem (VCO and frequency doubler) at 4 GHz versus frequency offset stressed that the achieved ratio of tuning range over power consumption (TR/P DC equals 5.972 or 7.76 dB), which has been set as the main design objective of this work, is comparable to the highest ones reported.…”

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confidence: 56%

Ultra-Wideband, Low-Power, Inductorless, 3.1–4.8 GHz, CMOS VCO

Τσίτουρας

Plessas

2010

Circuits Syst Signal Process

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A low-power, inductorless, UWB CMOS voltage controlled oscillator is designed in 0.18 µm CMOS technology targeting to a UWBFM transmitter application. The VCO is a Double-Cross-Coupled Multivibrator and generates output frequencies ranging from 1.55 GHz to 2.4 GHz. A low-power frequency doubler based on a Gilbert cell, which operates in weak inversion, doubles the VCO tuning range from 3.1 GHz to 4.8 GHz. The proportionality between the oscillation frequency and the bias current is avoided in this case for the entire achieved tuning range resulting in a low-power design. The selected architecture provides high suppression, over 45 dB, for the 1 st and 3 rd harmonics, while enabling high-frequency operation and conversion gain due to the unbalanced structure and the single-ended output. The proposed VCO draws 4 mA from a 1.8 V supply, it has a phase noise of −76.7 dBc/Hz at 1 MHz offset from the center frequency, while it exhibits a very high ratio of tuning range (43%) over power consumption equal to 7.76 dB.

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confidence: 56%