-Band Class-B VCO in 22 nm FD-SOI With Inductive Source Degeneration of the Tail Current Source<i />

Bozorgi, Farhad; Rahimi, Ebrahim; Cui, Mengqi; Sen, Padmanava

doi:10.1109/lmwc.2022.3178916

Cited by 6 publications
(3 citation statements)

References 12 publications

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“…A pair of varactors are used to fine-tune frequency, and a 4-bit binary-weighted switched capacitor bank is used to coarse-tune frequency. As the key block of the PLL system, the VCO phase noise dominates the PLL out-of-band phase noise performance [22,23,24], an inductor Ltail is introduced at the tail of the VCO to improve the VCO phase noise. The inductor Ltail and parasitic capacitance CP of MOSFETs resonate at the second harmonic of the oscillation frequency and provide a high impedance at the commonmode path, the high impedance can prevent the tank Qfactor from deteriorating.…”

Section: Vco Designmentioning
confidence: 99%

A 20.8-23.2GHz sub-sampling PLL with transformer-coupled VCO feedback loop achieving -47.05dBc reference spur and -245.9dB FOM in 40nm CMOS technology
Zhang,
Zheng,
Xia
et al. 2023
IEICE Electron. Express
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This paper presents a 20.8-23.2GHz integer-N sub-sampling phase-locked loop (SSPLL) with low-reference spur and low-phase noise. A transformer-coupled based voltage controlled oscillator (VCO) is employed and its output is feedback as the input to SSPD in subsampling PLL to reduce the reference spur without requiring extra area and power consumption. In addition, a common source feedback circuit is adopted in the proposed sub-sampling charge pump (SSCP) to reduce current mismatch. The proposed sub-sampling PLL is implemented in a 40nm CMOS technology, measured results exhibit a frequency tuning range of 10.9% from 20.8 to 23.2GHz. The measured phase noise is -106.92@1MHz offset, the reference spur is -47.05 dBc. The typical power consumption is 29.1 mW from a 1.1V supply voltage, leading to a PLL FoM of -245.9 dB. The PLL occupies a core area of 1.2mm 2 .

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Section: Vco Designmentioning
confidence: 99%

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“…Inductive source degeneration is used for the tail current source in a novel Class-B VCO operating in the K-band. As a result, the VCO's core size is decreased, and a compact, low-Q tail filtering inductor can be used at millimeter-wave frequencies [192].…”

Section: Class-b C D E F and Colpitts Lcvco 1) Class-b Lcvcomentioning
confidence: 99%

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends
Sivaraaj,
Majeed
2023
IEEE Access
16
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Voltage-controlled Oscillator (VCO) is a prominent part that has been used to generate a stable frequency for the high-frequency transceiver system. This survey encompasses a comparative analysis of two commonly used VCO architectures: the Ring VCO and LC-VCO. The Ring VCO has been constructed with the collection of ring delay cells. Moreover, the LC-VCO utilizes inductors, capacitors, fine-tuning circuits, coarse-tuning circuits to generate frequency. Furthermore, this study investigates an in-depth exploration of VCO structures, operational principles, advantages, limitations, and performance metrics. In addition, it evaluates performance parameters, including operating frequency range, phase noise, figure of merit, and tuning techniques. This research suggests that based on the application and its requirements, the VCO performance parameters need to be varied. This survey employs diverse types of VCO, and its design methods. Implications for future research and study of VCO design and integration are discussed.

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“…This method implements inductor LH and capacitor CH between the negative gm and AC ground. The LC tank suppresses even harmonics with high impedance to the second harmonic frequency [10], [11], [12], [29], [36], [44], [49]. As the LC configuration of the tail, the node touching the negative gm falls to a voltage lower than the ground and secures the VDS of the core MOSFET, increasing the output power of the VCO.…”

Section: Introductionmentioning
confidence: 99%

A 28-GHz–195-dB FoM_A 3.72-GHz/V Class-B/C Nested-gm VCO With Coupled Tail Filtering in a 65-nm CMOS
Sub Kim,
Oh,
Baek
2024
IEEE Access
2
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This paper introduces a class-B/C nested-gm voltage-controlled oscillator (VCO) with coupled tail filtering in the 28 GHz band. The addition of only two cross-coupled NMOSs duplicates the gm to boost the transconductance. This topology exhibits the characteristics of coupled VCOs, such as when two VCOs are interconnected through a transformer. The core area is minimized by implementing a tail-filtering inductor for a secondary harmonic filter in same space with the primary transformer. The proposed VCO is fabricated with a 65-nm CMOS process, an output frequency of 25.4-29.12 GHz, and a KVCO of 3.72 GHz/V. It has a supply voltage of 1 V and consumes 16.8 mW of power. It exhibits a phase noise of -105.34 dBc/Hz with a 1 MHz offset. The proposed VCO has a core area of 0.06 mm 2 . The figure of merit (FoM), FoM according to the area, and FoM according to dB, respectively.

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-Band Class-B VCO in 22 nm FD-SOI With Inductive Source Degeneration of the Tail Current Source

Cited by 6 publications

References 12 publications

A 20.8-23.2GHz sub-sampling PLL with transformer-coupled VCO feedback loop achieving -47.05dBc reference spur and -245.9dB FOM in 40nm CMOS technology

A 20.8-23.2GHz sub-sampling PLL with transformer-coupled VCO feedback loop achieving -47.05dBc reference spur and -245.9dB FOM in 40nm CMOS technology

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

A 28-GHz–195-dB FoM_A 3.72-GHz/V Class-B/C Nested-gm VCO With Coupled Tail Filtering in a 65-nm CMOS

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-Band Class-B VCO in 22 nm FD-SOI With Inductive Source Degeneration of the Tail Current Source

Cited by 6 publications

References 12 publications

A 20.8-23.2GHz sub-sampling PLL with transformer-coupled VCO feedback loop achieving -47.05dBc reference spur and -245.9dB FOM in 40nm CMOS technology

A 20.8-23.2GHz sub-sampling PLL with transformer-coupled VCO feedback loop achieving -47.05dBc reference spur and -245.9dB FOM in 40nm CMOS technology

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

A 28-GHz–195-dB FoMA 3.72-GHz/V Class-B/C Nested-gm VCO With Coupled Tail Filtering in a 65-nm CMOS

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A 28-GHz–195-dB FoM_A 3.72-GHz/V Class-B/C Nested-gm VCO With Coupled Tail Filtering in a 65-nm CMOS