Switching amplifier incorporating return-to-zero quaternary power switch
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United States of America Patent
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Oct 29, 2002
Grant Date -
Jun 20, 2002
app pub date -
Sep 27, 1999
filing date -
Sep 27, 1999
priority date (Note) -
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Abstract
Invention resides in a switching amplifier having a quaternary input control signal that provides quaternary levels (1, 0H, -1, and 0L) which is coupled to an H-bridge amplifier to provide error cancellation in switching amplifier output signal. The quaternary control signal alternates from a zero state at a high level ('0H') to a zero state at a low level ('0L') between each non-zero state (+1 or -1). In a preferred embodiment, a three-level sigma-delta modulator is provided for greater operational efficiency for ease of detecting zero states and minimizing power. The three-level sigma-delta modulator receives and converts an amplifier input signal into a ternary output signal that is then coupled to a ternary-to-quaternary converter to generate the quaternary control signal to provide as input to the H-bridge.
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