New low-power/high-speed double-cross-coupled ICO/VCO

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

doi:10.1109/mtttwa.1997.595133

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…From (19), (20) and (18), (21), it can be seen that V K appears to behave as a part of the small signal input voltage. Moreover, when the unbalanced differential pairs formed by M1, M4 and M2, M3 are considered, the following observations can be made: In the first case, at the left input of the circuit there is a small signal input equal to (−v d − V K )/2 and at the right input there is a small input signal equal to (v d + V K )/2.…”

Section: Analysis and Design Of An Unbalanced Gilbert Cell With Mosfementioning

confidence: 99%

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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Section: Analysis and Design Of An Unbalanced Gilbert Cell With Mosfementioning

confidence: 99%