Architectural Evolution of Integrated M-Phase High-Q Bandpass Filters

Mirzaei, Ahmad; Darabi, Hooman; Murphy, David

doi:10.1109/tcsi.2011.2161370

Cited by 136 publications

(104 citation statements)

References 20 publications

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“…This spatial filtering is up-converted to the RF node via passive mixers, so that it occurs directly at the antenna inputs. Moreover RC low-pass filtering also occurs on the capacitors, which is also up-converted, rendering high-Q N-path frequency-domain filtering at RF [12][13][14][15][16][17][18][19][20].…”

Section: A Spatial-and Frequency-domain Filteringmentioning

confidence: 99%

A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs

Ghaffari

Klumperink

Vliet

et al. 2014

IEEE J. Solid-State Circuits

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-To reject strong interference in excess of 0 dBm, a 4-element LO-phase shifting phased-array receiver with 8-phase passive mixers terminated by baseband capacitors is presented. The passive mixers up-convert both the spatial and frequency domain filtering from baseband to RF, hence realizing blocker suppression directly at the antenna inputs. A comprehensive mathematical model provides a set of closed-form equations describing the spatial and frequency domain filtering including imperfections. A prototype is realized in 28 nm CMOS. It exploits 3 rd harmonic reception to achieve a wide RF-frequency range from 0.6-4.5 GHz at 34-119 mW power dissipation, while also providing impedance matching. Out of the band/beam, a 1 dB-compression point as high as +12/+10 dBm has been measured. The 1-element NF over the RF-frequency range is 4-6.3 dB, while in-beam/band IIP3 values of 0..+2.6 dBm are measured. This proposed technique can be instrumental to make RF receivers more robust for interference, while still being flexibly tunable in frequency.

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Section: A Spatial-and Frequency-domain Filteringmentioning

confidence: 99%

A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs

Ghaffari

Klumperink

Vliet

et al. 2014

IEEE J. Solid-State Circuits

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“…5.2.2 top). Moreover RC low-pass filtering also occurs on the capacitors which is also upconverted to the switching frequency and its harmonics rendering high-Q "N-path" frequency domain band-pass filtering [5]- [7]. In order to rotate the direction of the received beam, a controllable phase shift is required.…”

Section: Textmentioning

confidence: 99%

Simultaneous spatial and frequency-domain filtering at the antenna inputs achieving up to +10dBm out-of-band/beam P_1dB

Ghaffari

Klumperink

Vliet

et al. 2013

2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers

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Abstract:A 4-element LO-phase shifting phased-array system with 8-phase passive mixers terminated by baseband capacitors is realized in 65nm CMOS. The passive mixers upconvert both the spatial and frequency domain filtering to RF, realizing blocker suppression directly at the antenna input. 3rd harmonic reception is used to widen the frequency range to 0.6-3.6GHz at 68-195mW power dissipation. Up to +10dBm of P 1dB for out-of-beam/band, a 1-element NF of 3-6dB and in-beam/band IIP3=+2..+9dBm are measured. 2 TextMulti-antenna transceivers with beam-forming are recently gaining interest also for low GHz frequencies (<6GHz) [1]-[4]. In the antenna beam, (phase shifted) signals from multiple antennas add constructively, improving SNR, while out-of-beam signals add destructively (i.e. spatial filtering).Usually the summation point is behind some gain blocks, which then need to be capable of handling strong signals. To improve the input-referred compression point P 1dB , a fully passive switchedcapacitor approach was presented in [4], providing P 1dB =+2dBm, but at a high noise penalty:NF=18dB. Here we propose to sum immediately at the baseband capacitors of passive mixer-first switched-RC down-converters. We will show that this can render a direction dependent RF impedance (spatial filtering) together with RF band-pass frequency filtering at lower noise and higherThe proposed architecture is shown in Analog G m blocks consume 36mW generating 100mS at I and Q paths. Overall power when 4 elements are activated is 68-195mW for the received frequency range of 0.6-3.6GHz. The maximum ripple in the gain is 2.5dB and in-beam/band IIP3 varies from +2.. +9dBm (see Fig. 5.2.5). The first harmonic is rejected between 15-25dB. The measurement results are compared to three previously reported 4-element phased-array systems. Clearly remarkable P 1dB and NF are achieved, and the dynamic range at the antenna inputs is substantially improved compared to previous work.Acknowledgment:

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“…These two main issues reduced the attention of researchers for N-path filters. The substantial improvement in the speed and the matching properties of CMOS technology renewed a great interest into N-path filters [95,96,97,98,99,100,101,102,103,104,105]. Because the main constituents of N-path filters are switches and capacitors, CMOS technology is the best candidate for the realization of this type of filters.…”

Section: N-path Filtersmentioning

confidence: 99%

“…An N-path BPF [81] that has recently attracted much attention [95,96,97,98,99,101,102,103,104,105] is illustrated in Fig. 2.19(a) where the on-resistance of the switches is modeled by a series resistance, R sw .…”

Section: N-path Filtersmentioning

confidence: 99%

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Active N-path Filters: Theory and Design

Darvishi¹

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Architectural Evolution of Integrated M-Phase High-Q Bandpass Filters

Cited by 136 publications

References 20 publications

A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs

A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs

Simultaneous spatial and frequency-domain filtering at the antenna inputs achieving up to +10dBm out-of-band/beam P_1dB

Active N-path Filters: Theory and Design

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Architectural Evolution of Integrated M-Phase High-Q Bandpass Filters

Cited by 136 publications

References 20 publications

A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs

A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs

Simultaneous spatial and frequency-domain filtering at the antenna inputs achieving up to +10dBm out-of-band/beam P1dB

Active N-path Filters: Theory and Design

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Simultaneous spatial and frequency-domain filtering at the antenna inputs achieving up to +10dBm out-of-band/beam P_1dB