N-bit pulse width modulated signal generator

Details N-bit pulse width modulated signal generator N-bit pulse width modulated signal generator

1997-11-04

1999-03-09

Grimm, Sigfried H.

Modulators

Pulse or interrupted continuous wave modulator

Pulse width modulator

375238, H03K 708

Patent

active

058806440

ABSTRACT:
A pulse width modulated signal generator is comprised of an N-bit ripple counter (12) that generates a down counted output value which is input to a combinatorial logic circuit for generating a pulse width that is defined as a predetermined number of clock cycles from a clock that is utilized to clock the ripple counter (12). The ripple counter (12) is cycled from a maximum value to a minimum value with the value "0000" inhibited. This count value is combined with a plurality of AND gates which also receive as an input an enable value from a input (18). When the ripple counter (12) is initiated at its maximum value, the output is pulled high and then a predetermined number of the clock pulses counted, as defined by the value of the enable word. Thereafter, the output is pulled low to define the length of the pulse.

REFERENCES:
patent: 4243921 (1981-01-01), Tamura et al.

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