Integrate and hold amplifier

Details Integrate and hold amplifier Integrate and hold amplifier

1989-01-31

1990-10-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 691, 455307, 333 19, 328151, H04J 100, H04B 110, H04B 30, H03K 500

Patent

active

049611844

ABSTRACT:
The present invention relates to a system which uses information in a certain band of frequencies, f.sub.b. The information of interest is contained in an analog signal that has noise at higher frequencies. The analog signal is sampled using an integrate and hold amplifier, hence, noise from higher frequencies is aliased into the region of interest f.sub.b. In accordance with the present invention, the integrated and hold amplifier has a frequency response which has a zero at a frequency, f.sub.n, which is one of the frequencies aliased into the band of frequencies f.sub.b. Thus, the effect of the noise that appears near the frequency f.sub.n has much less effect on the signal when it is aliased into the frequency band of interest, f.sub.b. The performance of the system is thereby improved.

REFERENCES:
patent: 4039979 (1977-08-01), Carbrey
patent: 4322697 (1982-03-01), Carbrey
Operational Amplifiers, The Devices and Their Applications, Charles F. Wojslaw, Evangelos A. Moustakas, 1986, pp. 320-322.

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