Analysis and Optimization of Direct-Conversion Receivers With 25% Duty-Cycle Current-Driven Passive Mixers

Mirzaei, Ahmad; Darabi, Hooman; Leete, J.; Chang, Yuyu

doi:10.1109/tcsi.2010.2043014

Cited by 193 publications

(82 citation statements)

References 23 publications

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“…Another analysis method assumes a current driven mixer with 25% duty cycle driving four baseband lowpass impedances Z BB (f) [20,40]. The RF source is now modelled as a current source with parallel impedance Z s (f RF ).…”

Section: Band-reject Filter (Brf) or Notch-filtermentioning

confidence: 99%

N-path filters and mixer-first receivers: A review

Klumperink

Westerveld

Nauta

2017

2017 IEEE Custom Integrated Circuits Conference (CICC)

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Abstract-To realize a Software Defined Radio covering the mainstream 0.5-6 GHz wireless communication bands, new SAW-less radio receiver architectures are being explored which realize selectivity in a more flexible and programmable fashion. N-path filters and mixer-first receivers can offer high-linearity high-Q RF-filtering around a center frequency defined by a digital clock, which offers the desired flexible programmability. This paper reviews recent research on N-path filters and mixerfirst receivers, identifies advances in performance analysis, circuit performance and applications.

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Section: Band-reject Filter (Brf) or Notch-filtermentioning

confidence: 99%

N-path filters and mixer-first receivers: A review

Klumperink

Westerveld

Nauta

2017

2017 IEEE Custom Integrated Circuits Conference (CICC)

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“…Using the model shown in Figure 1 the effect of impedance up-conversion resulting in a tunable narrowband selectivity achieved at RF can be demonstrated [5]. Assuming ZBB() to be low-pass and ignoring all higher harmonics the impedance seen by the source around the local oscillator frequency can be expressed by…”

Section: Filter Mechanismmentioning

confidence: 99%

Tunable selective receiver front end with impedance transformation filtering

Qazi

Duong

Dźbrowski

2015

Circuit Theory & Apps

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A highly selective impedance transformation filtering technique suitable for tunable selective RF receivers is proposed in this paper. To achieve blocker rejection comparable to SAW filters, we use a two stage architecture based on a low noise trans-conductance amplifier (LNTA). The filter rejection is captured by a linear periodically varying (LPV) model that includes band limitation by the LNTA output impedance and the related parasitic capacitances of the impedance transformation circuit. This model is also used to estimate "back folding" by interferers placed at harmonic frequencies. Discussed is also the effect of thermal noise folding and phase noise on the circuit noise figure. As a proof of concept a chip design of a tunable RF front-end using 65 nm CMOS technology is presented. In measurements the circuit achieves blocker rejection competitive to SAW filters with noise figure 3.25.2 dB, out of band IIP3 > +17 dBm and blocker P1dB > +5 dBm over frequency range of 0.5-3 GHz.

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“…3, N-path RC frequency-domain filtering also occurs on the baseband capacitors, which is up-converted to the switching frequency and its harmonics [14,16,18,21]. The periodically time-variant nature of N-path filters introduces frequency shifts by multiples of the clock frequency.…”

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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Analysis and Optimization of Direct-Conversion Receivers With 25% Duty-Cycle Current-Driven Passive Mixers

Cited by 193 publications

References 23 publications

N-path filters and mixer-first receivers: A review

N-path filters and mixer-first receivers: A review

Tunable selective receiver front end with impedance transformation filtering

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

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