Book ChapterDOI
Analog Integrated Polyphase Filters
Michiel Steyaert,Jan Crols +1 more
- pp 149-166
TLDR
The realization of a 5th order lowpass Butterworth filter centered around a low IF of 250 kHz is presented and is designed for a low-IF receiver for high quality applications.Abstract:
When it comes to integratability, the zero-IF receiver is an alternative for the heterodyne or IF receiver. In recent years it has been introduced in several applications, but its performance can not be compared to that of the IF receiver yet. In this paper the principle of the low-IF receiver is introduced. The low-IF receiver has a topology which is closely related to the zero-IF receiver. Like the zero-IF receiver, the implementation of a low-IF receiver can be done with a high degree of integration. Its performance can however be better. The low-IF receiver is not sensitive to DC-offsets or LO to RF crosstalk. The principle of the low-IF receiver is based on the replacement of the LF lowpass filter of a zero-IF receiver with an analog integrated active polyphase filter. An active polyphase filter can perform a lowpass filter operation shifted on to a center frequency. In this paper the realization of a 5th order lowpass Butterworth filter centered around a low IF of 250 kHz is presented. This polyphase filter is designed for a low-IF receiver for high quality applications. The filter is implemented with the active-RC technique in a standard 1.2 μm CMOS process.read more
Citations
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Proceedings ArticleDOI
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Abstract: An entire radio transceiver can be completely integrated into one IC chip. In order to integrate the IF filters on the chip, a heterodyne architecture with a low IF is used. A single, directly modulated VCO is used for both up-conversion during transmission, and down-conversion during reception. Bond-wires are used as resonators in the oscillator tank for the VCO. A TDD scheme is used in the air interface to eliminate cross-talk or leakage. A Gaussian-shaped binary FSK modulation scheme is used to provide a number of other implementation advantages.
Journal ArticleDOI
A 1-MHz-bandwidth second-order continuous-time quadrature bandpass sigma-delta modulator for low-IF radio receivers
TL;DR: In this article, the authors proposed a continuous-time bandpass /spl Sigma/spl Delta/ modulator with an anti-aliasing filter in front of the modulator and achieved a peak SNDR of 56.7 dB and a dynamic range of 63.8 dB within a 1-MHz signal bandwidth and at a clock frequency of 100 MHz.
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Integrated low-if terrestrial audio broadcast receiver and associated method
G. Tyson Tuttle,Dan B. Kasha +1 more
TL;DR: In this article, an integrated low-IF (low intermediate frequency) terrestrial broadcast receiver and associated method are disclosed that provide an advantageous and cost-efficient solution for small, portable devices and the reception of terrestrial audio broadcasts.
References
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Y.-T. Wang,Asad A. Abidi +1 more
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Journal ArticleDOI
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Patent
Asymmetric polyphase filter
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Journal ArticleDOI
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An analog integrated polyphase filter for a high performance low-IF receiver
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