An Inverted Complementary Cross-Coupled VCO to Reduce Phase Noise Sensitivity to <i>K</i>
                  <sub>VCO</sub>

Xu, Tianhui; Chen, Jiangbo; Du, Lin; Song, Chunyi; Gu, Qun Jane; Xu, Zhiwei

doi:10.1109/lmwt.2023.3234292

Cited by 2 publications

(2 citation statements)

References 15 publications

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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%

“…As the varactor size increases, KVCO increases to produce a wide FTR, but the output frequency sensitivity increases depending on the input voltage of the VCO. This also affects the Q of the core, resulting in low phase noise for the VCO [49]. Previous studies on VCOs have reduced the phase noise by increasing the Q while constructing a small varactor that is insensitive to changes in frequency but is characterized by a narrow FTR.…”

Section: Introductionmentioning

confidence: 99%

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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

Sub Kim,

Oh,

Baek

2024

IEEE Access

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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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Section: Introductionmentioning

confidence: 99%

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

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An 18–19.2 GHz Voltage-Controlled Oscillator with a Compact Varactor-Only Capacitor Array

et al. 2023

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This paper presents a K-band CMOS cross-coupled pair voltage-controlled oscillator (VCO) that utilizes the varactor-only capacitor network. The proposed circuit features low parasitics and a compact capacitor network, such that the varactor in the analog tuning path directly affects the oscillation frequency with a large gain of the VCO, and the varactor in the digital tuning path results in minimal noise sources, thus achieving low phase noise for the automotive FMCW radar application. This VCO was designed using TSMC 65 nm technology, and the post-layout simulation results show a stable oscillation across 18–19.2 GHz, a minimum phase noise of −105.9 and −128 dBc/Hz at 1- and 10-MHz offset frequencies while dissipating 21 mW of power from a 1 V supply. Furthermore, no notable variations in phase noise are observed across the oscillation frequency tuning range. It reveals a figure of merit (FOM) of −178.3 dBc/Hz while using a varactor-only capacitor array and occupying a small chip area.

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An Inverted Complementary Cross-Coupled VCO to Reduce Phase Noise Sensitivity to K _VCO

Cited by 2 publications

References 15 publications

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

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

An 18–19.2 GHz Voltage-Controlled Oscillator with a Compact Varactor-Only Capacitor Array

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An Inverted Complementary Cross-Coupled VCO to Reduce Phase Noise Sensitivity to K VCO

Cited by 2 publications

References 15 publications

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

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

An 18–19.2 GHz Voltage-Controlled Oscillator with a Compact Varactor-Only Capacitor Array

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Product

Resources

About

An Inverted Complementary Cross-Coupled VCO to Reduce Phase Noise Sensitivity to K _VCO

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

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