Highly Efficient Class-C CMOS VCOs, Including a Comparison With Class-B VCOs

Fanori, Luca; Andreani, Pietro

doi:10.1109/jssc.2013.2253402

Cited by 125 publications

(55 citation statements)

References 17 publications

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“…1(d)]. In [3], class-C oscillators were designed with both a tail transistor and a tail resistor. Measured 1/f 3 corners are almost the same, thus supporting our discussion.…”

mentioning

confidence: 99%

A 1/f Noise Upconversion Reduction Technique for Voltage-Biased RF CMOS Oscillators

Shahmohammadi

Babaie

Staszewski

2016

IEEE J. Solid-State Circuits

147

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“…1(d)]. In [3], class-C oscillators were designed with both a tail transistor and a tail resistor. Measured 1/f 3 corners are almost the same, thus supporting our discussion.…”

mentioning

confidence: 99%

A 1/f Noise Upconversion Reduction Technique for Voltage-Biased RF CMOS Oscillators

Shahmohammadi

Babaie

Staszewski

2016

IEEE J. Solid-State Circuits

147

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“…However, depending on whether or not the large tail capacitance C tail is connected to the common node of transistors Q1 and Q2, the oscillator is operated fully in Class-C or Class-B [27]. A detailed comparative study of class-B and class-C oscillators has been carried-out in [28]. …”

Section: Class-cmentioning

confidence: 99%

A Bandwidth-Enhanced Differential LC-Voltage Controlled Oscillator (LC-VCO) and Superharmonic Coupled Quadrature VCO for K-Band Applications

Ullah

Liu

et al. 2018

Electronics

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A novel varactor circuit exhibiting a wider tuning range and a new technique for quadrature coupling of LC-Voltage Controlled Oscillator (LC-VCO) is presented and validated on a 25 GHz oscillator. The proposed varactor circuit employs distribute-biased parallel varactors with a series inductor connected at both ends of the varactor bank to extend the tuning range of the oscillator. Similarly, the quadrature coupling is accomplished by employing the 2nd harmonic, explicitly generated in the stand-alone free-running differential oscillator using frequency doubler. As an example, the Differential VCO (DVCO) is tunable between 20 GHz and 31 GHz and exhibits the best Phase Noise (PN) of −100 dBc/Hz at 1 MHz offset frequency. Similarly, the Quadrature VCO (QVCO) covers 42% tuning bandwidth around 25 GHz oscillation frequency, which is significantly wider than other state-of-the-art VCOs at comparable frequencies. In addition, all the oscillators are designed in class-C to further improve their performances both in term of low power and low phase noise. The presented oscillators are designed using high-performance SiGe HBTs of the GlobalFoundries (GFs) 130 nm SiGe BiCMOS 8HP process. The presented DVCO and QVCO draw currents of approximately 10 mA and 21 mA, respectively from a 1.2 V supply.

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“…Class-B oscillator Fig. 1a shows a Class-B oscillator with an NMOS crosscoupled pair only, one of the best-known and widely employed topologies [1]. When the single-ended oscillation amplitude is lower than the supply voltage V DD (theoretical limit), the oscillator operates in the so-called "current limited" regime.…”

Section: Description Of the Topologiesmentioning

confidence: 99%

Analysis of power consumption in LC oscillators based on the inversion coefficient

Chicco

Pezzotta

Enz

2017

2017 IEEE International Symposium on Circuits and Systems (ISCAS)

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Abstract-This paper carries out a power-driven performance analysis on the most widely used LC oscillators' topologies, by means of the Inversion Coefficient methodology. The aim is to investigate on the best trade-off for Internet-of-Things related applications, where power consumption shall be minimized. The analysis is based on the BSIM6 model targeting a 40nm CMOS technology to investigate the trade-offs related to each topology and comparing them with respect to output voltage amplitude, phase noise and power consumption. The comparison is based on a figure-of-merit highlighting the best biasing regions, in terms of Inversion Coefficient, for the target required performance.

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Highly Efficient Class-C CMOS VCOs, Including a Comparison With Class-B VCOs

Cited by 125 publications

References 17 publications

A 1/f Noise Upconversion Reduction Technique for Voltage-Biased RF CMOS Oscillators

A 1/f Noise Upconversion Reduction Technique for Voltage-Biased RF CMOS Oscillators

A Bandwidth-Enhanced Differential LC-Voltage Controlled Oscillator (LC-VCO) and Superharmonic Coupled Quadrature VCO for K-Band Applications

Analysis of power consumption in LC oscillators based on the inversion coefficient

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