公开(公告)号：US20170250600A1

公开(公告)日：2017-08-31

申请号：US15597850

申请日：2017-05-17

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John P. Lesso ,  Peter J. Frith ,  John L. Pennock

IPC: H02M3/07

CPC classification number: H02M3/07 ,  H02M1/00 ,  H02M2001/0083 ,  H02M2001/009 ,  H03F3/181

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.

公开(公告)号：US20160211816A1

公开(公告)日：2016-07-21

申请号：US15085360

申请日：2016-03-30

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John P. Lesso ,  John L. Pennock ,  Peter J. Frith

IPC: H03G1/00 ,  H03F1/02 ,  H03F3/185 ,  H02M3/07

CPC classification number: H02M3/07 ,  H03F1/025 ,  H03F3/185 ,  H03F3/187 ,  H03F3/68 ,  H03F2200/507 ,  H03F2200/511 ,  H03G1/0017 ,  H03G1/0029 ,  H03G1/0088 ,  H03G1/0094

Abstract: A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.