Charge pump with symmetrical +V and -V outputs

Details Charge pump with symmetrical +V and -V outputs Charge pump with symmetrical +V and -V outputs

1992-06-04

1994-04-26

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Capacitor

Parallel-charge, series-discharge

363 60, H02M 318

Patent

active

053069544

ABSTRACT:
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.

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