Modulator having improved discharging unwanted capacitance

Details Modulator having improved discharging unwanted capacitance Modulator having improved discharging unwanted capacitance

1998-02-17

1999-05-11

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330251, 332149, H03F3/38

Patent

active

059031883

ABSTRACT:
A pulse step modulator comprising is disclosed including a plurality of series connected unit step modules, each including a DC voltage source and an associated actuatable switch for, when on, turning on the associated module to provide a unit step voltage. An output circuit is connected to the series connected modules for providing an output voltage to a load wherein the magnitude of the output voltage is equal to the sum of all the voltage sources of the modules that are turned on. A plurality of module turn on signals are provided, each for turning on a switch in one of the modules for the time duration of the turn on signal after which the switch is turned off. Each unit step module includes a transformer means exhibiting an associated unwanted capacitance between transformer means and circuit ground and which capacitance becomes charged when the associated switch is turned on. Each unit step module has capacitance discharge means for rapidly discharging the associated capacitance each time the associated switch is turned off.

REFERENCES:
patent: 4047120 (1977-09-01), Lord et al.
patent: 4403197 (1983-09-01), Swanson
patent: 4560944 (1985-12-01), Furrer
patent: 5111373 (1992-05-01), Higaki
patent: 5309114 (1994-05-01), Swanson
patent: 5381109 (1995-01-01), Cripe et al.
patent: 5392007 (1995-02-01), Cripe

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