FAST START-UP CIRCUIT FOR AUDIO DRIVER
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United States of America Patent
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N/A
Issued Date -
Nov 10, 2011
app pub date -
May 4, 2010
filing date -
May 4, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A driver device for suppression audible transients of an audio amplifier includes an amplifier for receiving an audio signal and a bias circuit configured to quickly generate a voltage level for biasing the amplifier, wherein the voltage level is maintained even if the driver device is powered off. The bias circuit may include a CMOS inverter having a negative feedback that has a standby current of less than 100 nA. The bias circuit further includes a buffer for rapidly charging an external capacitor. The buffer may change to a high impedance state rapidly when the power supply is disconnected.
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