Ultra-low phase noise 7.2&amp;#x2013;8.7 Ghz clip-and-restore oscillator with 191 dBc/Hz FoM

Babaie, Masoud; Visweswaran, Akshay; He, Zhuobiao; Staszewski, Robert Bogdan

doi:10.1109/rfic.2013.6569517

Cited by 4 publications

(9 citation statements)

References 5 publications

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“…is defined as the difference between the active devices normalized to their sum and it can be expressed as a function of the steady-state oscillation state as: (5) where is the effective supply voltage, as shown in Fig. 2(a).…”

Section: ) Tail Tank Losses: If a Noise Chargementioning

confidence: 99%

“…First, acting on the conversion of circuit noise into phase noise through the impulse sensitivity function (ISF) [1]; second, changing the maximum achievable power conversion efficiency ( ), i.e., the conversion of DC power ( ) into resonator RF power ( ), which directly affects phase noise [2]. The use of voltage-biased topologies Manuscript [3]- [5] eliminates a source of phase noise (i.e., the current generator) and improves power efficiency, but increases the sensitivity to supply voltage variations. Large voltage swings (relative to the supply voltage) are desirable to achieve high voltage efficiency, thus high power efficiency, and to reduce phase sensitivity to device noise, but they can drive the active devices into the triode region, thereby loading the tank, potentially degrading phase noise.…”

Section: Introductionmentioning

confidence: 99%

“…If a step-up transformer is used to magnetically couple gate and drain, the gate voltage swing can be enhanced [9], further reducing the ISF. The clip-and-restore [5] oscillator deliberately pushes the active devices into deep triode in order to create a non-sinusoidal waveform at the drain that alters the ISF. When the active devices are ON their drain voltage is nearly flat, desensitizing the oscillation phase to circuit noise.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

Garampazzi¹,

Mendes

Codega³

et al. 2015

IEEE J. Solid-State Circuits

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A complementary p-n class-B oscillator with two magnetically coupled second harmonic tail resonators is presented and compared to an N-only reference one. An in depth analysis of phase noise, based on direct derivation of the Impulse Sensitivity Function (ISF), provides design insights on the optimization of the tail resonators. In principle the complementary p-n oscillator has the same optimum Figure of Merit (FoM) of the N-only at half the voltage swing. At a supply voltage of 1.5 V, the maximum allowed oscillation amplitude of the N-only is constrained, by reliability considerations, to be smaller than the value that corresponds to the optimum FoM even when 1.8 V thick oxide transistors are used. For an oscillation amplitude that ensures reliable operation and the same tank, the p-n oscillator achieves a FoM 2 to 3 dB better than the N, only depending on the safety margin taken in the design. After frequency division by 2, the p-n oscillator has a measured phase noise that ranges from 150.8 to 151.5 dBc/Hz at 10 MHz offset from the carrier when the frequency of oscillation is varied from 7.35 to 8.4 GHz. With a power consumption of 6.3 mW, a peak FoM of 195.6 dBc/Hz is achieved.

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Section: ) Tail Tank Losses: If a Noise Chargementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

Garampazzi¹,

Mendes

Codega³

et al. 2015

IEEE J. Solid-State Circuits

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show abstract

“…the conversion of DC power (P DC ) into resonator RF power (P RF ), which directly affects the phase noise [2]. The use of voltage-biased topologies [3]- [5] eliminates a source of phase noise (i.e. the current generator) and improves power efficiency but increases frequency pushing.…”

Section: Introductionmentioning

confidence: 99%

“…Paulo Mendes research was partially supported by grant SFRH/BSAB/1245/2012. switching, and clip-and-restore [5], where loading effects are compensated adopting step-up transformers to boost the gate voltage and reduce phase sensitivity to device noise. However, on-chip transformers typically have lower quality factors than simple inductors [6] 1 , moreover, in both cases a low supply is required for reliability.…”

Section: Introductionmentioning

confidence: 99%

A 195.6dBc/Hz peak FoM P-N class-B oscillator with transformer-based tail filtering

Garampazzi

Mendes

Codega

et al. 2014

ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC)

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A complementary p-n class-B oscillator with two magnetically coupled second harmonic tail resonators is presented. For the same oscillation amplitude (constrained by reliability considerations) and the same tank, the p-n oscillator achieves 3-4dB better Figure of Merit (FoM) than an n-only reference one. After frequency division by 2, the p-n oscillator has a measured phase noise that ranges from -150.8 to -151.5 dBc/Hz at 10MHz offset from the carrier when the frequency of oscillation is varied from 3.64 to 4.15GHz. With a power consumption of 6.3mW, a peak FoM of 195.6 dBc/Hz is achieved.

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Oscillators

2020

Radio Frequency Integrated Circuits and Systems

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Ultra-low phase noise 7.2–8.7 Ghz clip-and-restore oscillator with 191 dBc/Hz FoM

Cited by 4 publications

References 5 publications

Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

A 195.6dBc/Hz peak FoM P-N class-B oscillator with transformer-based tail filtering

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