Apparatus for controlling a switching amplifier
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United States of America Patent
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-
Jun 20, 1989
Grant Date -
N/A
app pub date -
Jun 16, 1987
filing date -
Jun 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for controlling the output of a switching amplifier includes a signal dividing circuit which generates a delayed replica of the carrier signal and a doubled signal having twice the carrier frequency. The doubled signal is effective for establishing a second time delayed signal relative to the first time delayed signal. The first and second time delayed signals are logically operated on so that a three state output representing the carrier signal is attained. A summing amplifier utilizes the two time delayed signals to generate this three state output whereby if the two time delayed signals are out-of-phase, a zero voltage is connected to the drive portion of the switching amplifier thereby limiting the output of the switching amplifier.
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