A 1.35–2.12-GHz Constantly Low-Phase-Noise VCO Based on Constant ABW Quasi-Elliptic BPF

Li, Zhiyou; Tang, Xiao; Lu, Di; Cai, Zongqi; Liu, Yong; Luo, Junxin

doi:10.1109/lmwc.2019.2916812

Cited by 7 publications

(17 citation statements)

References 7 publications

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“…Moreover, the CM suppression is below 48 dB, which ensures the realization of the differential signal within the FTR. 14 Due to the fabrication and soldering error of the eight varactor diodes, there is a certain difference between the simulated and measured frequency responses, which shows a little effect on the oscillator performance. 15…”

Section: Tunable Four-pole Bal-bpf With Cabwmentioning

confidence: 99%

“…As the tuning capacitance C t varies from 8.5 to 1.25 pF, the simulated DM passband center frequency is tuned from 1.65 to 2.2 GHz while keeping the 3 dB‐BW at 132.5 ± 2.5 MHz and insertion loss (IL) better than 4 dB. Moreover, the CM suppression is below 48 dB, which ensures the realization of the differential signal within the FTR 14 . Due to the fabrication and soldering error of the eight varactor diodes, there is a certain difference between the simulated and measured frequency responses, which shows a little effect on the oscillator performance 15 .…”

Section: Design Of Parallel‐feedback Differential Vcomentioning

confidence: 99%

“…As can be seen, the signals exhibit anti‐phase within the oscillating FTR. The figure‐of‐merit (FOM) is used to weigh the overall performance of an oscillator: 14

FOM = L ((), Δf) - 20 \log ((), \frac{f_{0}}{italicΔf}) + 10 \log ((), \frac{P_{dc}}{1 mW}),

where L (Δ f ) is phase noise at Δ f frequency offset, f 0 is oscillation frequency, and P dc is the DC power consumption in mW . The FOM of the proposed differential VCO at 1.77 GHz is −184.7 dBc/Hz at 1 MHz frequency offset.…”

Section: Design Of Parallel‐feedback Differential Vcomentioning

confidence: 99%

“…To deal with this tradeoff, a widely tuned VCO with constantly low-phase noise was proposed. 14 It was realized by employing a wide-tuning-range filter with constant absolute bandwidth (CABW) and quasi-elliptic response.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, the tunable differential resonant network with wide frequency tuning range (FTR) exhibits low‐loaded quality factor ( Q L ), 9‐13 so it is difficult to implement a differential VCO with low‐phase noise and wide FTR simultaneously. To deal with this tradeoff, a widely tuned VCO with constantly low‐phase noise was proposed 14 . It was realized by employing a wide‐tuning‐range filter with constant absolute bandwidth (CABW) and quasi‐elliptic response.…”

Section: Introductionmentioning

confidence: 99%

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Constantly low‐phase‐noise differential VCO based on balanced tunable quasi‐elliptic and constant‐ABW BPF

Tang

Liu

et al. 2021

Micro & Optical Tech Letters

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In this article, a parallel-feedback differential voltagecontrolled oscillator (VCO) with constantly low-phase noise and frequency tuning range (FTR) of 1.72-2.12 GHz (20.8%) is presented. The presented differential VCO with differential outputs and low-phase noise is achieved using a four-pole tunable balanced bandpass filter (BAL-BPF) with quasi-elliptic frequency response as a frequency stabilization element. The low-phase noise is obtained and maintained because of the high in-band group delay and the constant absolute bandwidth (CABW) of the used tunable BAL-BPF. For demonstration, an example is designed, fabricated, and measured. The measured oscillation frequency of the differential VCO can be tuned from 1.72-2.12 GHz (20.8%) and the phase noises keep better than −99 dBc/Hz @100 kHz and − 129.1 dBc/Hz @1 MHz over the FTR. In the meantime, the differential oscillating signals are generated at two outputs.

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Section: Tunable Four-pole Bal-bpf With Cabwmentioning

confidence: 99%

Section: Design Of Parallel‐feedback Differential Vcomentioning

confidence: 99%

“…As can be seen, the signals exhibit anti‐phase within the oscillating FTR. The figure‐of‐merit (FOM) is used to weigh the overall performance of an oscillator: 14

FOM = L ((), Δf) - 20 \log ((), \frac{f_{0}}{italicΔf}) + 10 \log ((), \frac{P_{dc}}{1 mW}),

Section: Design Of Parallel‐feedback Differential Vcomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Constantly low‐phase‐noise differential VCO based on balanced tunable quasi‐elliptic and constant‐ABW BPF

Tang

Liu

et al. 2021

Micro & Optical Tech Letters

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A low phase noise dual‐band voltage‐controlled oscillator based on switchable tunable filter

Wang¹,

Lai

Wang³

et al. 2022

Micro & Optical Tech Letters

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In this letter, a parallel‐feedback dual‐band voltage‐controlled oscillator (DVCO) with low phase noise and a wide tuning range is proposed. The DVCO is composed of two tunable filters associated with four switches and an active device. By controlling four switches, the oscillation frequency can be switched and oscillated in one of two bands. The employed tunable filter with maintained passband shape and wide frequency tuning range (FTR) is beneficial to designing wideband DVCO with low phase noise. Owing to the maintained frequency response, the sharp phase variation and high in‐band group delay can be maintained during the filter tuning process, which can enhance the phase noise improvement. Moreover, the sharp phase variation can realize the phase compensation in a wide FTR when tuning the DVCO. To develop a DVCO with a simple circuit scheme, the two‐pole tunable filters with two different FTRs are designed. For verification, the proposed DVCO is designed, manufactured, and measured. The measurement results show that each band of the DVCO has a tuning range of 1.97–2.58 GHz (27.8%) and 2.934–3.468 GHz (16.7%), respectively. For the lower band, the phase noise at 100 kHz and 1 MHz frequency offset is better than −99.2 and −126.4 dBc/Hz, respectively. While for the upper band, the phase noise at 100 kHz and 1 MHz frequency offset is better than −101.2 and −127.4 dBc/Hz, respectively.

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A comparative study on low phase noise feedback oscillators based on planar elliptic resonators

Varcheh

Rezaei

2022

Analog Integr Circ Sig Process

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A 1.35–2.12-GHz Constantly Low-Phase-Noise VCO Based on Constant ABW Quasi-Elliptic BPF

Cited by 7 publications

References 7 publications

Constantly low‐phase‐noise differential VCO based on balanced tunable quasi‐elliptic and constant‐ABW BPF

Constantly low‐phase‐noise differential VCO based on balanced tunable quasi‐elliptic and constant‐ABW BPF

A low phase noise dual‐band voltage‐controlled oscillator based on switchable tunable filter

A comparative study on low phase noise feedback oscillators based on planar elliptic resonators

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