Jiter-invariant switched capacitor pulse shaper

Details Jiter-invariant switched capacitor pulse shaper Jiter-invariant switched capacitor pulse shaper

1989-05-16

1991-06-04

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307268, 328 27, 341150, H03K 500, H03B 2800

Patent

active

050216813

ABSTRACT:
An output pulse signal can be fabricated in an integrated circuit from an input signal. The output signal retains the desired pulse shape unaffected by jitter. A switched capacitor FIR filter is used to form the pulse shape, and then the clocking of the digital signals used to operate the pulse shaper is controlled to control the timing of different segments. The result is an output signal which has jitter but retains the desired pulse shape. Since a phase corrector which senses jitter can control the clocking, the output pulse shape is unaffected by jitter. The output pulse signal can be produced in an integrated circuit since switched capacitor pulse shapers are used, rather than a continuous time filter. More particularly, an analog pulse signal is produced from an input digital signal by applying the input signal to serial shift registers, each spanning less than a baud, operating switched corresponding ones of the shift registers to form different parts of an output signal, summing the output signals in time to form a combined output signal, and low pass filtering the combined output signal to form the analog pulse signal.

REFERENCES:
patent: 4467319 (1984-08-01), Uchikoshi
patent: 4542371 (1985-09-01), Uchikoski
patent: 4751666 (1988-06-01), Gillingham
patent: 4814637 (1989-03-01), Roessler et al.

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