An IF Bandpass Filter Based on a Low Distortion Transconductor

Le-Thai, Ha; Nguyen, Huy-Hieu; Nguyen, Hoai‐Nam; Cho, Hong-Soon; Lee, Jeong-Seon; Lee, Sang‐Gug

doi:10.1109/jssc.2010.2063991

Cited by 32 publications

(17 citation statements)

References 17 publications

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“…Equation (11) indicates that the HFB from |±N + 1|ω s to ω s will be removed if CLK-Set2 has T s /2N time shift compared with the CLK-Set1. Generally, folding from |nN + 1|ω s (n = ±1, ±2, …,) to ω s will be removed for odd values of n by selecting α 1 = ±T s /2N.…”

Section: -Of-n-path Filtermentioning

confidence: 99%

“…Power consumption increasing is the cost of techniques that are proposed to increase DR of these filters. In addition, extra circuits are needed to make them tunable [11,12].The N-path filter is another option that can be used as an on-chip tunable filter. Initially, due to the technology limitations, this technique was utilized to implement low-frequency filters [13][14][15][16][17].…”

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confidence: 99%

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Harmonic fold back reduction at the N‐path filters

Hemati

Jannesari

2016

Circuit Theory & Apps

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Summary In this paper, a method is proposed to reduce harmonic fold back (HFB) problem of N‐path filters, without increasing the input reference clock (fCLK) frequency. The HFB at the N‐path filter is analyzed, and simple expressions are extracted to model this problem. Using the results of the analysis, an M‐of‐N‐path filter has been proposed that behaves like an M × N‐path filter in terms of HFB problem; however, the fCLK frequency of this structure is the same as an N‐path filter. To demonstrate the feasibility of the proposed idea, a 3‐of‐4‐path filter is designed, and its characteristics are compared with 4‐path and 12‐path filters by simulation. Impacts of different non‐idealities like clock‐phase error, mismatch, and parasitic capacitance are investigated. The transistor‐level implementation of this filter is performed in 0.18 µm Complementary Metal Oxide Semiconductor (CMOS) technology. The simulation results show that the filter has the pass‐band gain of 17 dB, tuning range of 0.2–1.2 GHz, −3 dB bandwidth of 25 MHz, quality factor of 8–48, 18 dB out‐of‐band rejection, 16 dB rejection of the third harmonic of switching frequency (fs), and the noise figure of 4.35 dB (using ideal Gm cells) and 6.95 dB (for practical Gm cells). The strongest harmonic folding to the filter pass‐band occurs around 11fs with the attenuation of 23.8 dB. Each Gm cell draws about 12.4 mA from 1.8 V supply, and the out‐of‐band IIP3 and P1 dB,CP are 17 and 4 dBm, respectively. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: -Of-n-path Filtermentioning

confidence: 99%

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confidence: 99%

Harmonic fold back reduction at the N‐path filters

Hemati

Jannesari

2016

Circuit Theory & Apps

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“…Several state-of-the-art CMOS design techniques such as gm-C filters, enhanced LC filters, N-path, and pseudo-N-path filters have been presented. Most of them have either low band pass gain, high noise figure, or low tuning frequency range [2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Their weak linearity is improved by applying linearization techniques such as resistive source degeneration, dynamic source degenerated differential pair, tunable feedback, and adaptive feedback. However, these techniques have low pass band gain and narrow tuning range [7,10]. The -enhanced LC band pass filter through an adjustable negative-conductance generator is capable of operating in low-voltage supply but it has low pass band gain (−5 dB) and high noise figure (26.8 dB) [8].…”

Section: Introductionmentioning

confidence: 99%

Process Variation Aware Wide Tuning Band Pass Filter for Steep Roll-Off High Rejection

Chen

2015

VLSI Design

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A wide tuning band pass filter (BPF) with steep roll-off high rejection and low noise figure is presented. The design feature of steep roll-off high stopband rejection (>20 dB) and low noise figure (<6 dB) provides a wide tuning frequency span (1–2.04 GHz) to accept desirable signals and reject close interfering signals. The process variation aware design approach demonstrates robustness of the BPF after calibration from process variations, operating in 1.04 GHz tuning frequency span: almost zero deviation on center frequency, an average maximum deviation 1.16 dB on a nominal pass band gain of 55.6 dB, and an average maximum deviation 1.06 MHz on a nominal bandwidth of 12.3 MHz.

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“…The filter is compared with [19,20,97,103,107,110,111] receivers [19,103] in the comparison table. Our filter outperforms Q-enhancement [20] and G m -C [110] filters from a linearity, noise and tunability point of view. According to [14], the DR of G m -C filters depends on 1/Q 2 while the dynamic range of Qenhancement filters depends on Q 2 0 /Q 2 where Q 0 is the quality factor of on-chip inductors.…”

Section: Measurementsmentioning

confidence: 99%

Active N-path Filters: Theory and Design

Darvishi¹

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An IF Bandpass Filter Based on a Low Distortion Transconductor

Cited by 32 publications

References 17 publications

Harmonic fold back reduction at the N‐path filters

Harmonic fold back reduction at the N‐path filters

Process Variation Aware Wide Tuning Band Pass Filter for Steep Roll-Off High Rejection

Active N-path Filters: Theory and Design

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