A Double notch RF filter architecture for SAW-less GPS receivers

Barth, Carsten; Linscott, I. R.; Inan, U. S.

doi:10.1109/iscas.2011.5937935

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…10 introduces the term in (11). As near the zero frequency , a valid approximation of (11) is given by (12) As it can be seen from (8) and (12), the transconductance stage provides a transmission zero at and the transimpedance stage at . On the other hand, (7) and (11) have their maxima at and at , respectively.…”

Section: Double Notch Filtermentioning

confidence: 99%

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An Image Frequency Rejection Filter for SAW-Less GPS Receivers

Barth

Linscott

Inan

2012

IEEE Trans. Circuits Syst. I

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We have developed an on-chip RF filter in 130 nm BiCMOS for SAW-less GPS receivers. The filter is implemented as a cascode amplifier stage with reactive resonant tanks. The filter employs two Q-enhanced LC tanks to create a transfer function with steep roll-off characteristic and narrow passband. The image rejection filter achieves a 3 dB bandwidth of less than 12 MHz at the GPS center frequency of 1575.42 MHz. The resulting magnitude response exhibits a notch at 1540 MHz and at 1610 MHz, attenuating noise and interference 30 MHz away from the center frequency by more than 30 dB. The NF of the RF filter is 4.0 dB. A competitive power consumption of only 5.7 mW is achieved.Index Terms-GPS receiver, notch filter, Q-enhanced resonator, surface acoustic wave (SAW) filter.

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Section: Double Notch Filtermentioning

confidence: 99%

“…1 to control the poles and zeros of the filter transfer function. This work is an extension of the idea presented in [12], with focus on the theory and design of the filter architecture. In Section II, the theoretical groundwork for the filter is laid out and the performance of the Q-enhanced spiral inductors is discussed.…”

Section: Introductionmentioning

confidence: 99%

An Image Frequency Rejection Filter for SAW-Less GPS Receivers

Barth

Linscott

Inan

2012

IEEE Trans. Circuits Syst. I

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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%

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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“…Recently, in order to reduce the number of off-chip components and increase the system integration level, efforts solving the problem of blockers to the GNSS receiver in cellular phones without SAW filter have been made [4]- [7]. [4] and [5] focus on a on-chip notch filter to replace the SAW filter. A double notch RF filter architecture is proposed in [4], which takes advantage of two sets of LC parallel series resonant tanks to achieve the double notch.…”

Section: Introductionmentioning

confidence: 99%

“…[4] and [5] focus on a on-chip notch filter to replace the SAW filter. A double notch RF filter architecture is proposed in [4], which takes advantage of two sets of LC parallel series resonant tanks to achieve the double notch. However, the notch filter exhibits a high noise figure and needs a number of on-chip inductors which takes up a large silicon area.…”

Section: Introductionmentioning

confidence: 99%

SAW-less GNSS front-end amplifier with 80.4-dB GSM blocker suppression using CMOS directional coupler notch filter

Zheng

Chen

et al. 2013

2013 IEEE International Symposium on Circuits and Systems (ISCAS2013)

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This paper presents a SAW-less GNSS front-end amplifier with GSM blocker suppression using CMOS directional coupler notch filter. The front-end amplifier is aimed at the GNSS receiver integrated in cellular phones. Based on our proposed CMOS stacked spiral-coupled (SSC) directional coupler working at the frequency of 900MHz as notch filter, the front end amplifier achieves a NF of 1.7dB and a 80.4-dB suppression of the GSM blocker while provides signal gain of 38.6-dB for the GPS L1-band signal.I.

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A Double notch RF filter architecture for SAW-less GPS receivers

Cited by 9 publications

References 5 publications

An Image Frequency Rejection Filter for SAW-Less GPS Receivers

An Image Frequency Rejection Filter for SAW-Less GPS Receivers

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

SAW-less GNSS front-end amplifier with 80.4-dB GSM blocker suppression using CMOS directional coupler notch filter

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