Amplifiers – Modulator-demodulator-type amplifier
Patent
1997-07-23
1999-11-09
Pascal, Robert
Amplifiers
Modulator-demodulator-type amplifier
330207A, H03F 338, H03F 2100
Patent
active
059822317
ABSTRACT:
An improved class D power amplifier is disclosed. Instead of using prior art triangle waves, a ramp signal having a first state of about 90% or greater is used and a second state for the remainder of the cycle. Further, the amplifier includes flip-flops and amplifers with hysteresis to reduce switching noise. Also, level shifting circuitry is provided for shifting the level of the input signal in response to both DC and AC variations in the power supply and to provide power supply rejection. Still further, multiple channels may be used with all of the channels synchronized to the same timing source.
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Harris Corporation, APP Note Harris Intelligent Power, Class-D Audio II Evaluation Board (HIP4080AEVAL2), No. AN9525.2, Mar. 1996.
Harris Corporation, APP Note Harris Intelligent Power, HIP4080A, 80V High Frequency H-Bridge Driver, No. AN9404.1, Mar. 1995.
Linfinity Microelectronics Inc.
Nguyen Patricia Thuy
Pascal Robert
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