Design and Analysis on Bidirectionally and Passively Coupled QVCO With Nonlinear Coupler

Kuo, Nai-Chung; Chien, Jun-Chau; Niknejad, Ali M.

doi:10.1109/tmtt.2015.2407356

Cited by 21 publications

(11 citation statements)

References 19 publications

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“…It is desirable to design a QVCO with low K VCO . Previously, QVCOs with switchable capacitors utilise different switching controlled signals that are able to improve K VCO and tuning range [7,17,18]. However, QVCO with switchable capacitors will increase the chip area as well as the cost and the extra switching noise.…”

Section: Simulated and Measured Resultsmentioning

confidence: 99%

K‐band low‐power dual‐hybrid‐coupling quadrature voltage‐controlled oscillator

Weng

Huang

Chiang

2019

IET Microwaves, Antennas & Propagation

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A low‐power and low phase noise quadrature voltage‐controlled oscillator (QVCO) is presented for short range radar systems here. A dual‐hybrid coupling (DHC) technique is adopted to increase the output voltage swing. The second harmonic filters are applied to eliminate the phase noise as well as to suppress the phase error. The proposed DHC‐QVCO was implemented with a low cost standard 0.18 μm complementary metal‐oxide‐semiconductor (CMOS) process technology. The oscillation frequency is operated between 19.8 and 21.5 GHz. The tuning range is 8.5%. The phase noise achieves −100.1 dBc/Hz at 1 MHz offset from a carrier frequency of 20.6 GHz. The phase error and gain error are 4.29° and 3.2 dBm, respectively. The core circuit consumes only 5.15 mW from a power supply of 1.5 V. The designed DHC‐QVCO has demonstrated the advantages of low‐power, low phase noise, and wide tuning range for K‐band applications.

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Section: Simulated and Measured Resultsmentioning

confidence: 99%

K‐band low‐power dual‐hybrid‐coupling quadrature voltage‐controlled oscillator

Weng

Huang

Chiang

2019

IET Microwaves, Antennas & Propagation

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“…The deterioration of phase noise and quadrature phase error is a well-known trade-off in QVCO design [12], [13]. In this work, the dual-mode quadrature topology is proposed to achieve the quadrature signal in a wide frequency range.…”

Section: B Dual-mode Quadrature Oscillatormentioning

confidence: 99%

A Cascaded Mode-Switching Sub-Sampling PLL With Quadrature Dual-Mode Voltage Waveform-Shaping Oscillator

Shu

Qian

Luo

2021

IEEE Trans. Circuits Syst. I

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A cascaded mode-switching sub-sampling PLL with quadrature dual-mode voltage waveform-shaping oscillator is proposed in this paper. The dual-mode voltage waveform-shaping oscillator is introduced to extend the tuning range and improve phase noise performance at mm-wave frequency, simultaneously. Meanwhile, the dual-mode quadrature topology is investigated to reduce the phase noise and quadrature phase error, compared to conventional quadrature oscillator. Then, the proposed oscillator is applied in a cascaded PLL with divider-less mode-switching sub-sampling loop, which can obtain the merits of high frequency-resolution, low loop noise, and wide frequency locking range. Both the dual-mode voltage waveform-shaping oscillator and the cascaded PLL are verified and fabricated in a 28-nm CMOS process. The FoM and FoM T of the oscillator at 10 MHz offset are −188.2 dBc/Hz and −200.7 dBc/Hz respectively. The proposed PLL prototype exhibits a frequency range from 22.8 to 33.9 GHz with a typical power consumption of 41.7 mW. The phase noise across the frequency band is from −104.1 to −108.2 dBc/Hz at 1 MHz offset. The jitter FoM j is −236.2 dB.

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“…This result in amplitude imbalance and phase error. The focus of this Section is the phase error, since in a practical system the LO signals are normally fed to hard limiting buffers and an I/Q mixer that is almost insensitive to small amplitude imbalance (provided that the signal amplitude is large) [9], [11]. Deriving elegant closed-form expressions for the phase error at different tank nodes under the presence of mismatches for this QVCO topology is not trivial.…”

Section: E Phase Errormentioning

confidence: 99%

“…Moreover, the simplified linear model in Fig. 3 when extended to describe mismatch due to the tank, would not account for circuit nonlinearity that may play a significant role (as is the case for QVCO that employs passive nonlinear coupler [11]).…”

Section: E Phase Errormentioning

confidence: 99%

Analysis and Design of an E-Band Transformer-Coupled Low-Noise Quadrature VCO in 28-nm CMOS

Vigilante

Reynaert

2016

IEEE Trans. Microwave Theory Techn.

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This paper presents an E-Band quadrature voltagecontrolled oscillator (QVCO) implemented in 28 nm CMOS. Two fundamental oscillators are coupled by means of gate-to-drain transformers to realize accurate quadrature phases and switched coupled inductors are added for tuning extension. Closed-form expressions of the oscillation frequency and the tuning extension design parameters are derived. The time-variant nature of the circuit-noise to phase-noise of the presented topology is investigated, resulting in simple design guidelines for optimal design. Based on the proposed techniques, the realized prototype is tunable over two bands of almost 5 GHz each separated in frequency, while occupying only 0.031 mm 2 . The peak measured phase noise at 10 MHz offset is -117.7 dBc/Hz from a 72.7 GHz carrier and -110 dBc/Hz from a 88.2 GHz carrier and varies less than 3.5 dB within each band.

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Design and Analysis on Bidirectionally and Passively Coupled QVCO With Nonlinear Coupler

Cited by 21 publications

References 19 publications

K‐band low‐power dual‐hybrid‐coupling quadrature voltage‐controlled oscillator

K‐band low‐power dual‐hybrid‐coupling quadrature voltage‐controlled oscillator

A Cascaded Mode-Switching Sub-Sampling PLL With Quadrature Dual-Mode Voltage Waveform-Shaping Oscillator

Analysis and Design of an E-Band Transformer-Coupled Low-Noise Quadrature VCO in 28-nm CMOS

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