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4 - Discrete-Time Band-Pass Filter
Massoud Tohidian, Iman Madadi, Amir Bozorg, University College Dublin, Robert Bogdan Staszewski, University College Dublin
Book:

Wireless Discrete-Time Receivers

Published online:

05 May 2022

Print publication:

19 May 2022, pp 87-106
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Summary

A complex quadrature charge-sharing (CS) technique is utilized to implement a discrete-time band-pass filter with a programmable bandwidth of 20–100 MHz. The BPF is a natural part of a cellular superheterodyne receiver and completely determines the receiver frequency selectivity. It operates at the full sampling rate (4×) (described in Chapter 2 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 advantages of CS-BPFover other band-pass filters, such as N-path, active-RC, Gm-C, and biquad are 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.