Charge pump circuit
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsJohn P. Lesso, Peter J. Frith, John L. Pennock
Life of this patent
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Abstract
A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes and a second pair of output nodes, and two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first bipolar output voltage at the first pair of output nodes and a second bipolar output voltage at the second pair of bipolar output nodes.
Claims20
An audio output chain, comprising:
- a charge pump,
- a first component supplied, in use, with a first bipolar supply voltage from said charge pump;
- and
- a second component supplied, in use, with a second bipolar supply voltage from said charge pump.
An audio output chain, comprising:
- a signal path block for receiving an input audio signal and processing the input audio signal to drive a load, the signal path comprising at least first and second components;
- and
- a charge pump circuit configured to provide a first bipolar output voltage at a first pair of output nodes and a second bipolar output voltage at a second pair of output nodes;
- wherein said first component is coupled to receive said first bipolar output voltage and said second component is coupled to receive said second bipolar output voltage.
An audio output chain comprising first and second components in a playback path and a charge pump circuit for powering the first and second components, wherein the charge pump circuit is configured to supply said first component with a first bipolar supply voltage and to supply said second component with a second bipolar supply voltage, which is independent of the first bipolar voltage.
Dependencies are inferred from the claim text.