460 μW 32 dB image rejection ratio second‐order active‐RC complex filter with improved power efficient opamp

Wang, J.; Ye, L.; Chen, L.; Liu, J.; Liao, Huailin

doi:10.1049/el.2012.3690

Cited by 11 publications

(1 citation statement)

References 4 publications

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“…In contrast with passive polyphase filters, active polyphase filters have the general advantages of small chip area, high signal gain and easy tuning. Many active polyphase filters have also been discussed in some literature [19,20,21,22,23,24,25,26,27,28,29,30], but few of them achieve strong image rejection at high operating frequency and low-power dissipation.…”

Section: Introductionmentioning

confidence: 99%

The design of large image rejection and wideband CMOS active polyphase filter for BeiDou RF receiver

Yin

wang

et al. 2020

IEICE Electron. Express

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In this letter, a new circuit structure for CMOS active polyphase filter is proposed and analyzed. In the proposed structure, the currents produced from two cascode stage with a capacitor and single cascode stage in a single-stage are used to realize high-pass and low-pass functions, respectively. Compared to other conventional active polyphase filters, the proposed polyphase filter uses a simpler structure to achieve strong image rejection at the higher frequency while obtaining lower power consumption and smaller chip area. In the 0.18-µm CMOS process, the proposed active polyphase filter occupies less than 0.36mm 2 of chip area. From the measurements, the four-stage active polyphase filter shows an image rejection ratio of more than 58.2dB at frequencies of 26MHz to 65MHz, a voltage gain of 5.8dB and an IIP3 of 1.5dBm at 45 MHz while consuming only 2.64mA from a 1.8-V supply.

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Section: Introductionmentioning

confidence: 99%

The design of large image rejection and wideband CMOS active polyphase filter for BeiDou RF receiver

Yin

wang

et al. 2020

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

A 2.4‐mW interference‐resilient receiver front end with series N‐path filter–based balun for body channel communication

Liu

Zheng

Wang

et al. 2018

Circuit Theory & Apps

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SummaryThis paper presents an interference‐resilient receiver front end for body channel communication, which uses the human body as the signal transmission medium in the band of 40 to 60 MHz. To tackle strong out‐of‐band interference resulting from the human body antenna effect, a series N‐path filter–based balun preceding a low‐noise amplifier is proposed to improve the frequency modulation radio interference suppression and realize single‐to‐differential transformation of input body channel communication signals. Besides, an enhanced harmonic rejection with combination of a series N‐path filter and a harmonic rejection passive mixer using 8‐phase 12.5% duty‐cycle clocks as local oscillator is presented. The transconductance amplifier sharing is used to reduce the power consumption of the mixer. Fabricated in a standard 0.18‐μm complementary metal‐oxide‐semiconductor process, the proposed receiver front end occupies an area of 780 × 660 μm2 including pads. Operating at 50 MHz, the front end consumes 1.35 mA from a 1.8‐V supply and achieves a maximum gain of 50.5 dB with a noise figure of 11.2 dB, 28.5 dB frequency modulation interference suppression at the second‐order harmonic rejection, and 53.9 dB at the third‐order harmonic rejection.

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A new passive compensation structure for Chebyshev complex band‐pass filter design

Wang

Kuo

2018

Micro & Optical Tech Letters

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A new passive compensation structure for Chebyshev‐I complex band‐pass filter is presented. The proposed method aims to cancel the excess phase lag of the integrators caused by the limited gain‐bandwidth product (GBW) of the amplifier, thus ensuring the in‐band flatness of the magnitude‐frequency response. A fifth‐order Chebyshev‐I active‐RC complex band‐pass filter (CBPF) is implemented in TSMC 0.13 μm CMOS technology with a center frequency of 12.24 MHz and a bandwidth of 9 MHz for low‐IF receivers. The CBPF achieves a 46 dB image rejection ratio, a 0.7 dB ripple in the passband and consumes 14.6 mA current from a 1.5 V power supply.

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460 μW 32 dB image rejection ratio second‐order active‐RC complex filter with improved power efficient opamp

Cited by 11 publications

References 4 publications

The design of large image rejection and wideband CMOS active polyphase filter for BeiDou RF receiver

The design of large image rejection and wideband CMOS active polyphase filter for BeiDou RF receiver

A 2.4‐mW interference‐resilient receiver front end with series N‐path filter–based balun for body channel communication

A new passive compensation structure for Chebyshev complex band‐pass filter design

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