PWM Communication system

Details PWM Communication system PWM Communication system

1996-01-25

1997-04-15

Chin, Stephen

Pulse or digital communications

Pulse width modulation

327 31, 329312, H03K 908

Patent

active

056217587

ABSTRACT:
A data output portion transmits a pulse signal having a pulse width according to a value of transmit data on a predetermined cycle. An H pulse width counter and an L pulse width counter measure a length of a high level period and a length of a low level period in the received pulse signal by using a clock signal having the same frequency as that of the clock signal used in the data output portion. A comparing portion compares the sum of both the measured lengths of the periods with the predetermined cycle, and outputs an error signal in case of a mismatch. In a PWM communication system, it is also possible to detect a signal delay or an error of the clock signal, which is temporarily caused within one cycle.

REFERENCES:
patent: 4608630 (1986-08-01), Schott
patent: 5122778 (1992-06-01), Erhart
patent: 5315299 (1994-05-01), Matsumoto
patent: 5436853 (1995-07-01), Shimohara
patent: 5459751 (1995-10-01), Okamoto
patent: 5483542 (1996-01-01), Nguyen

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