Anti-Pop Circuit
First Claim
Patent Images
1. A reduced pop amplifier comprising:
- an amplifier stage;
an output stage comprising;
a core output stage;
an input to the core output stage coupled to the amplifier stage;
an output of the core output stage and;
a compensation network coupled between the output and the input;
said compensation network comprising a capacitor, a first switch and a second switch;
wherein the first switch breaks the connectivity between the output and the input when a control signal is low but maintains the connectivity between the input and the output when the control signal is high and the second switch shunts the capacitor to a low power voltage when the control signal is low.
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Abstract
Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
15 Citations
22 Claims
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1. A reduced pop amplifier comprising:
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an amplifier stage; an output stage comprising; a core output stage; an input to the core output stage coupled to the amplifier stage; an output of the core output stage and; a compensation network coupled between the output and the input; said compensation network comprising a capacitor, a first switch and a second switch; wherein the first switch breaks the connectivity between the output and the input when a control signal is low but maintains the connectivity between the input and the output when the control signal is high and the second switch shunts the capacitor to a low power voltage when the control signal is low. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for reducing pop in an amplifier circuit comprising:
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breaking a connection in a compensation network coupled to an input and an output of an output stage in the amplifier circuit to prevent current from flowing between the output and the input; and shunting a capacitor in the compensation network to a low power voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A reduced pop amplifier comprising:
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an amplifier stage; an output stage comprising; a core output stage; an input to the core output stage coupled to the amplifier stage; an output of the core output stage; a compensation network comprising a capacitor coupled to the input and the output; means for breaking a connection in the compensation network to prevent current from flowing between the output and the input; means for shunting a capacitor in the compensation network to a low power voltage. - View Dependent Claims (19, 20, 21, 22)
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Specification