Analysis and Design of I/Q Charge-Sharing Band-Pass-Filter for Superheterodyne Receivers

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Title: Analysis and Design of I/Q Charge-Sharing Band-Pass-Filter for Superheterodyne Receivers
Authors: Madadi, Iman
Tohidian, Massoud
Staszewski, Robert Bogdan
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Date: Jul-2015
Abstract: A complex quadrature charge-sharing (CS) technique is proposed to implement a discrete-time band-pass filter (BPF) with a programmable bandwidth of 20-100 MHz. The BPF is part of a cellular superheterodyne receiver and completely determines the receiver frequency selectivity. It operates at the full sampling rate of up to 5.2 GHz corresponding to the 1.2 GHz RF input frequency, thus making it free from any aliasing or replicas in its transfer function. Furthermore, the advantage of CS-BPF over other band-pass filters such as N-path, active-RC, Gm-C, and biquad is described. A mathematical noise analysis of the CS-BPF and the comparison of simulations and calculations are presented. The entire 65 nm CMOS receiver, which does not include a front-end LNTA for test reasons, achieves a total gain of 35 dB, IRN of 1.5 nV/√(Hz), out-of-band IIP3 of +10 dBm. It consumes 24 mA at 1.2 V power supply.
Funding Details: European Research Council
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Circuits and Systems I: Regular Papers
Volume: 62
Issue: 8
Start page: 2114
End page: 2121
Copyright (published version): 2015 IEEE
Keywords: ReceiverHigh-IFSuper-heterodyneCS-BPFNoiseSwitched-capacitorIIRN-path
DOI: 10.1109/TCSI.2015.2437514
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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