05306954 is referenced by 73 patents and cites 39 patents.

Charge pump circuitry is implemented using a voltage shifting technique to generate a symmetrical bipolar voltage. The symmetrical bipolar voltage charge pump power supply can be fabricated as an integrated circuit on a single substrate, and can be integrated with various interface circuits to provide symmetrical bipolar voltage thereto. The charge pump includes voltage shifting circuitry which generates an increased output voltage of a negative polarity and an increased output voltage of a positive polarity. The shifting circuitry is responsive to an internal oscillator which triggers charge accumulation and voltage shifting. Neither output voltage is generated from the other output voltage. Rather, the negative and positive supply voltages are each generated, in substantially the same manner, by charge transfer effected by the voltage shifting circuitry in response to triggering by the internal oscillator. Additional circuitry can be fabricated on a single substrate in combination with the presently disclosed charge pump to effect the optimum utilization of circuit board area while minimizing power consumption.

Title
Charge pump with symmetrical +V and -V outputs
Application Number
7/893519
Publication Number
5306954
Application Date
June 4, 1992
Publication Date
April 26, 1994
Inventor
Raymond W B Chow
Saratoga
CA, US
Paul S Chan
Cupertino
CA, US
Agent
Weingarten Schurgin Gagnebin & Hayes
Assignee
Sipex Corporation
MA, US
IPC
H02M 3/18
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