Blocker cancelling LNA with integrated bandpass feedback stage

Kwon, Ickjin; Oh, Dan

doi:10.1049/el.2012.1619

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…However, the UWB receiver consumes more power and has a more complicated structure than conventional narrowband receivers. Thus, a 3-10 GHz UWB lownoise amplifier (LNA) is critical for achieving wideband input impedance matching and low-noise figure (NF) and low-power consumption [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The common-gate (CG) LNA architecture has the advantage of wideband input impedance matching [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, a 3–10 GHz UWB low‐noise amplifier (LNA) is critical for achieving wideband input impedance matching and low‐noise figure (NF) and low‐power consumption [1–15]. The common‐gate (CG) LNA architecture has the advantage of wideband input impedance matching [1–7]. Noise‐cancelling techniques have been proposed to remove the input noise of CG transistors [8–10, 16, 17].…”

Section: Introductionmentioning

confidence: 99%

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3–10 GHz noise‐cancelling CMOS LNA using g _m ‐boosting technique

Lee

Kwon

2017

IET Circuits, Devices & Systems

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An ultra-wideband (UWB) low-noise amplifier (LNA) using a 0.11 µm CMOS technology is proposed. The commongate (CG) input stage for wideband input impedance matching and the common-source (CS) stage for noise cancelling are applied. In the proposed LNA, the current of the CG input stage can be significantly reduced by applying the g m-boosting technique using the noise-cancelling CS stage without additional amplifier, and the noise performance can be improved at the same power consumption. For low-power operation, the LNA consumes 2.9 mW and achieves a noise figure (NF) of S 21

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3–10 GHz noise‐cancelling CMOS LNA using g _m ‐boosting technique

Lee

Kwon

2017

IET Circuits, Devices & Systems

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“…1 shows a circuit schematic of the UWB LNA with a bandpass feedback stage. The bandpass feedback scheme creates a notch transfer function at the blocker frequency [10]. The bandpass transfer function of the feedback stage can be expressed as:…”

Section: Introductionmentioning

confidence: 99%

Ultra-wideband CMOS low-noise amplifier with active interferer rejection

Hwang

Kwon

2016

IEICE Electron. Express

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A CMOS 3-5 GHz ultra-wideband (UWB) low-noise amplifier (LNA) with an integrated active interferer rejection is presented. The LNA eliminates the out-band 2.4 GHz interferers without deteriorating the input matching and gain by employing the active tunable bandpass feedback loop to produce a notch at the interferer frequencies. The proposed LNA is fabricated using a 0.18 µm CMOS process. The 3-5 GHz UWB LNA with the integrated bandpass feedback loop achieves an out-band 2.4 GHz interferer rejection of 29.2 dB, a power gain of 15.3 dB, and a minimum noise figure of 4 dB with a power consumption of 9.1 mW.

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Radio‐frequency amplifier with tunable high‐Q RF bandpass filtering for SAW‐less wireless receivers

Chi

et al. 2013

Electron. lett.

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An inductor-less on-chip radio frequency bandpass filtering (RF-BPF) technique with tunable centre frequency is proposed to replace the bulky and expensive external SAW filter. The centre frequency of the BPF not only tracks the local oscillation (LO) frequency ( f LO ), but also can be shifted from f LO to a controllable offset for low-IF applications. The RF-BPF has been embedded into a single-ended-input differential-output radio frequency amplifier (RFA) and implemented in 65nm CMOS. The RFA draws 3.5 mA DC current from a 2.5 V power supply. Measurement results show that the BPF achieves 16 dB attenuation at 150 MHz offset from the 1.5 GHz centre frequency, and 7 MHz tunable range without changing the LO frequency.Introduction: In modern highly-integrated communication devices, different kinds of wireless transceivers cohabit within a limited physical space, which poses high linearity requirement, especially the capability of being resilient to large out-of-band (OOB) blockers. Traditionally, an off-chip bandpass surface acoustic wave (SAW) filter with fixed centre frequency and high quality factor (Q) is placed ahead of each receiver to attenuate strong interference from others. However, the SAW filter is bulky and expensive. Also, it is not flexible to support different operation modes or standards with different carrier frequencies. Therefore, many SAW filters would be needed for multi-band multi-mode transceivers, leading to unacceptable device size and cost.Recently, the translational-impedance technique was proposed for a SAW-less direct-conversion receiver [1], which employs a passive mixer driven by non-overlapping LO to shift the baseband lowpass impedance into a bandpass impedance centred at the LO frequency. In this way OOB blockers can be attenuated at the very first stage. This technique is proposed for zero-IF receivers and is not suitable for low-IF receivers, especially the ones with high immediate frequency after down-conversion. The reason is that, in low-IF receivers, the desired signal locates at some offset from the LO frequency. To fully cover the RF signal band, the bandwidth of the baseband impedance should be designed wider, which in turn decreases the Q of the RF filtering as well as the attenuation rate of OOB blockers.In this Letter, we extend the traditional translational-impedance and propose a technique to provide RF impedance with controllable frequency offset from the LO centre frequency. This technique is used for low-IF SAW-less receivers (in our case, a GNSS receiver), in which sharp selectivity can be provided just at the desired signal frequency, while keeping the whole signal band in coverage.

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Blocker cancelling LNA with integrated bandpass feedback stage

Cited by 4 publications

References 3 publications

3–10 GHz noise‐cancelling CMOS LNA using g _m ‐boosting technique

3–10 GHz noise‐cancelling CMOS LNA using g _m ‐boosting technique

Ultra-wideband CMOS low-noise amplifier with active interferer rejection

Radio‐frequency amplifier with tunable high‐Q RF bandpass filtering for SAW‐less wireless receivers

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Blocker cancelling LNA with integrated bandpass feedback stage

Cited by 4 publications

References 3 publications

3–10 GHz noise‐cancelling CMOS LNA using g m ‐boosting technique

3–10 GHz noise‐cancelling CMOS LNA using g m ‐boosting technique

Ultra-wideband CMOS low-noise amplifier with active interferer rejection

Radio‐frequency amplifier with tunable high‐Q RF bandpass filtering for SAW‐less wireless receivers

Contact Info

Product

Resources

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3–10 GHz noise‐cancelling CMOS LNA using g _m ‐boosting technique

3–10 GHz noise‐cancelling CMOS LNA using g _m ‐boosting technique