Pulse--width modulation system
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
Dec 19, 1997
filing date -
Dec 19, 1997
priority date (Note) -
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Abstract
A high-power PWM system with improved low-power performance and which includes an oscillator configured to provide a substantially periodic signal to a pulse-width modulator. The pulse-width modulator outputs a PWM signal, derived from the analog signal and the periodic signal, on the PWM output node to a high-power amplifier that can select from a number of power-supply voltages. The PWM system improves amplification accuracy at low input signal levels by selecting a reduced power-supply voltage. The pulse width of the PWM signal is increased proportional to the decrease in the power-supply voltage to maintain the gain factor of the system at low power.
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