Charge pump circuit
AssigneeCirrus Logic, Inc.
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, 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 mode and a second mode when in use with two flying capacitors connected to the flying capacitor nodes, wherein at least the first mode corresponds to a bipolar output voltage of +/−3VV, +/−VV/5 or +/−VV/6.
Claims19
A charge pump circuit operable to output a bipolar output voltage, comprising:
- a first input node for connection to a first input voltage;
- a second input for connection to a second input voltage;
- a first output node and a second output node configured to output the bipolar output voltage;
- two pairs of flying capacitor nodes;
- a network of switching paths comprising a plurality of switches for interconnecting said nodes;
- and
- a switch controller operable to control the switches of the network of switching paths, when the charge pump circuit is in use with two flying capacitors connected to the flying capacitor nodes and with first and second reservoir capacitors connected to the first and second output nodes respectively, to repeatedly charge the first and second reservoir capacitors to provide the bipolar output voltage,
- wherein the switch controller is operable in at least four different operating modes, said operating mode comprising:
- a first mode where the bipolar output voltage is +/−2*VV;
- a second mode where the bipolar output voltage is +/−VV;
- a third mode where the bipolar output voltage is +/−VW;
- a fourth mode where the bipolar output voltage is +/−VW/2;
- where VV is the first input voltage and VW is the second input voltage.
A charge pump circuit comprising:
- a first input node for receiving a first input voltage;
- a second input node for receiving a second input voltage;
- first and second output nodes for outputting first and second output voltages of equal and opposite magnitude with respect to a reference voltage;
- flying capacitor nodes for connecting to first and second flying capacitors;
- a network of switching paths comprising a plurality of switches for interconnecting said nodes;
- and
- a switch controller operable to control the switches of the network of switching paths, when the charge pump circuit is in use with said first and second flying capacitors connected to the flying capacitor nodes, to generate the first and second output voltages, wherein the switch controller is operable so that the first and second output voltages can be selectively controlled to have a magnitude equal to any of:
- twice the magnitude of the first input voltage;
- the same magnitude as the first input voltage;
- the same magnitude as the second input voltage;
- and
- half the magnitude as the second input voltage.
A charge pump circuit for receiving a voltage input and outputting a bipolar output voltage, the charge pump circuit comprising:
- flying capacitor nodes for connection to two flying capacitors;
- a switch network comprising a plurality of switches;
- a switch controller for selectively controlling said switches in a sequence of switch states to generate the bipolar output voltage;
- wherein the voltage input can be selected to be a first input voltage or a second input voltage;
- and
- wherein the charge pump circuit is operable such that the bipolar output voltage can be selected to be any of +/−2*VV, +/−VV, +/−VW or +/−VW/2 where VV is the first input voltage and VW is second input voltage.
Dependencies are inferred from the claim text.