Matched filter

Details Matched filter Matched filter

1997-04-02

1999-09-28

Le, Amanda

Pulse or digital communications

Repeaters

Testing

375343, 36472411, 327551, H04K 100

Patent

active

059600330

ABSTRACT:
A sample-hold circuit, which is constituted by a capacitor and a differential amplifier or a capacitor and an inversion amplifier, is provided with a first switch for short-circuiting the input and output, a second switch for switching the input-side terminal of the input capacitor to a reference voltage input, a third switch for switching the output-side terminal of the feedback capacitor to the reference voltage input, and a fourth switch for switching the input-side terminal of the input capacitor to an input voltage; thus a refreshing operation is available. Consequently, it is possible to compensate for deviations in offset voltage that are inherently caused by process deviations of MOS amplifiers, and to improve the precision of the output of the matched filter. Moreover, in addition to sample-hold circuits having conventional number of steps, a plurality of sample-hold circuits are added, and steps of shift registers, which have binary correlation filter coefficients stored therein, are also added as many as the same number of the added sample-hold circuits. Thus, during the refreshing operation, the extra circuits are used to carry out the process. With this arrangement, it becomes possible to provide a matched filter that is capable of refreshing the sample-hold circuits without adversely affecting the correlation output.

REFERENCES:
patent: 5737368 (1998-04-01), Shou et al.
patent: 5841315 (1998-11-01), Shou et al.
patent: 5844937 (1998-12-01), Zhou et al.
"Low Power Consumption Matched Filter LSI for Wideband DS-CDMA", M. Sawahashi et al. Technical Report of IEICE (Jan. 1996), The Institute of Electronics, Information and Communication Engineers.
"Matched Filter for DS-CDMA of up to 50MChip/s Based on Sampled Analog Signal Processing", T. Shibano et al., 1997 IEEE International Solid-State Circuits Conference pp. 100, 101, 439, 76, 77, 368 and 369.
"Yozan, NTT Develop Low-Power CDMA IC", Nikkei Electronics Asia, May 1996, News Focus Mobile Phone/Spread Spectrum, Nikkei Electronics Asia 1996.5.
"Yozan Spread-Spectrum, Matched Filter Features Low Power" G. Shou et al., Nikkei Electronics Asia, Aug. 1996 Design & Manufacturing, Nikkei Electronics Asia 1996.8.

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