Pulse width modulator for AM-RF transmitter
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United States of America Patent
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-
Jan 23, 1990
Grant Date -
N/A
app pub date -
Feb 25, 1986
filing date -
Feb 25, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An RF-AM transmitter of the type including a power pulse amplifier driving an RF amplifier with a modulating voltage via a low pass filter includes a pulse width modulator for deriving variable frequency pulses having a frequency that is a direct function of an RMS like function of the amplitude and frequency of an information source; the width of the pulses is determined by the instantaneous amplitude of the information signal source. The pulse width modulator includes a constant amplitude, variable frequency triangular wave voltage controlled oscillator responsive to a DC signal representing the frequency and amplitude of the information source. In response to amplitude crossovers between the variable frequency triangular wave and the information source, transitions in the pulse width modulated wave are derived.
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