VCO with double cross-coupled high-speed and low-power multivibrator architecture

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

doi:10.1109/iscas.1996.539804

Cited by 6 publications

(10 citation statements)

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%

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

Τσίτουρας

Plessas

2010

Circuits Syst Signal Process

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“…In this brief, in addition to the active pull-down technique [4]- [6], which was introduced in the context of multivibrators in [7], [8], another well-known method, peak shunting [9], is shown to be useful in reducing switching time and so increasing the maximum possible oscillation frequency of the circuit, while still giving reasonable output power.…”

Section: Introductionmentioning

confidence: 99%

A 3.6 GHz double cross-coupled multivibrator VCO with 1.6-GHz tuning

Vaananen

Metsanvirta²,

Tchamov

2001

IEEE Trans. Circuits Syst. II

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This brief presents a fully monolithic voltage-controlled oscillator (VCO) based on double cross-coupled multivibrator architecture with a speed enhancing -load designed and implemented on a standard 0.35-m BiCMOS process. The tuning range achieved is greater than 1.6 GHz with a center frequency of 3.6 GHz and the measured phase noise is 98 2 dBc/Hz at an offset frequency of 600 kHz. The VCO draws 17.5 mA from a 2.4 V supply.Index Terms-BiCMOS technology, multi-GHz VCO, wide tuning range.

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“…3. In order to achive lower voltage supply compared to the circuit developed in [5], The speed is almost the same as before.…”

Section: High-speed and Low-power Double-cross Icomentioning

confidence: 99%

“…, the finite V T of the MOS transistors, which prevent them working properly at such low voltages. Bipolar transistors can be used instead, but the result will be not better, due to the reasons described in [3,4,5].…”

Section: High-speed and Low-power Double-cross Icomentioning

confidence: 99%

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

Tchamov

Popov²,

Jarske³

1996 IEEE-CAS Region 8 Workshop on Analog and Mixed IC Design. Proceedings

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New circuits of high-speed multivibrators are developed and consequently used to create new circuit of ICOIVCo. While implemented on 0.8 IJm BiCMOS (14GHz NPN) an amplitude on the symetrical output of 55 Om V at 2GHz, with consumption less than 3.3mW from 1.5V power supply can be easily achieved. The control ability of the ICO is about 2.6MHzlpA. The low phase-noise makes the circuit also suitable for building high-speed PLLs for various applications in communications and microprocessors.

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VCO with double cross-coupled high-speed and low-power multivibrator architecture

Cited by 6 publications

References 3 publications

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

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

A 3.6 GHz double cross-coupled multivibrator VCO with 1.6-GHz tuning

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

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