Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1992-06-05
1993-08-17
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
330149, 455 63, H03F 134
Patent
active
052372880
ABSTRACT:
An apparatus for generating an amplified signal from an input signal. The apparatus comprises: (a) a phase-shifting circuit for shifting the phase of a feedback signal derived from the amplified output signal in response to a control signal; (b) a differencing circuit for generating an output signal based on the input signal and the phase-shifted feedback signal; (c) a filter for filtering the output signal; and (d) a power amplifier for amplifying the filtered output signal to obtain the amplified output signal. The apparatus further comprises a CPU and DAC for generating a control signal corresponding to a control signal value associated with a frequency range including the operating frequency from a table associating predetermined control signal values with frequency ranges in the portion of the frequency spectrum in which the amplifier is designed to operate. Phase shift introduced by the filter is thus compensated for by the phase-shifting circuit to maintain negative feedback and thus system stability.
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Mullins James B.
SEA, Inc.
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