Frequency conversion and modulation circuits

Details Frequency conversion and modulation circuits Frequency conversion and modulation circuits

1996-05-28

1998-12-08

Bocure, Tesfaldet

Pulse or digital communications

Equalizers

375295, H03H 730

Patent

active

058481001

ABSTRACT:
In a frequency conversion circuit and a modulation circuit, a filter having an impulse response (HB(z); HL(z)) corresponding to a rectangular pulse wave multiplied by a cosine wave of f.sub.3 /4 is a band pass type filter having a center frequency of f.sub.3 /4, and the transfer function H(z) of the filter is expressed in the form of a sum of series. When a numerator part of the transfer function is arranged to be processed with a low-speed sampling frequency f.sub.2 and a denominator part is to be processed with a high-speed sampling frequency f.sub.3 (=L.times.f.sub.2, L: odd number), the circuit can be made to have an adjustment-free structure and small in size. Further, when an output of processing of the numerator part based on the low-speed sampling frequency f.sub.2 is subjected to a D/A conversion while processing of the denominator part based on the high-speed f.sub.3 is implemented by a switched capacitor circuit, power consumption can be reduced.

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Todaka, et al, "Realization of Multirate Digital Filters with Powers-of-Two Coefficients", The Institute of Electronics, Information and Communication Engineers (IEICE), vol. J74-A, No. 9, Sep. 1991, pp. 1366-1373.
IEEE ICASSP 80 Proceedings, vol. 1 of 3, Apr. 9, 10, 11, 1980, Denver, CO (USA), pp. 271-274, XP002013588, E.B. Hogenauer, "A Class of Digital Filters for Decimation and Interpolation".

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