A wideband blocker-resilient direct delta sigma receiver with selective input-impedance matching

This paper presents a wideband blocker-tolerant direct Δ Σ receiver (DDSR). Blockers are attenuated through selective input impedance matching and reduced gain design. The selective input impedance profile provides a low impedance at blocker frequencies enabling blocker attenuation, while the in-ban...

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Veröffentlicht in:	Analog integrated circuits and signal processing 2020-04, Vol.103 (1), p.195-207
Hauptverfasser:	Ul Haq, Faizan, Englund, Mikko, Östman, Kim B., Stadius, Kari, Kosunen, Marko, Koli, Kimmo, Ryynänen, Jussi
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Sprache:	eng
Schlagworte:	Attenuation Bandwidths Broadband Circuits and Systems Electrical Engineering Engineering Impedance Impedance matching Input impedance Noise levels Positive feedback Signal,Image and Speech Processing
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creator	Ul Haq, Faizan Englund, Mikko Östman, Kim B. Stadius, Kari Kosunen, Marko Koli, Kimmo Ryynänen, Jussi
description	This paper presents a wideband blocker-tolerant direct Δ Σ receiver (DDSR). Blockers are attenuated through selective input impedance matching and reduced gain design. The selective input impedance profile provides a low impedance at blocker frequencies enabling blocker attenuation, while the in-band impedance is boosted to matched condition through an up-converted positive feedback from the DDSR output. In addition, with the help of reduced gain design, near band blocker gain is minimized, further improving the blocker resilience. The receiver is designed for configurable operation from 0.7–2.7 GHz and a baseband bandwidth of 10 MHz. Simulated in a 28 nm technology, the DDSR demonstrates a maximum noise figure of 6.2 dB, and achieves a peak SNDR of 53 dB with an out-of-band 1 dB input compression point of - 11 dBm at a 100 MHz offset.
doi_str_mv	10.1007/s10470-020-01611-2
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subjects	Attenuation Bandwidths Broadband Circuits and Systems Electrical Engineering Engineering Impedance Impedance matching Input impedance Noise levels Positive feedback Signal,Image and Speech Processing
title	A wideband blocker-resilient direct delta sigma receiver with selective input-impedance matching
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