Charge pump including feedback circuitry for eliminating the req

Details Charge pump including feedback circuitry for eliminating the req Charge pump including feedback circuitry for eliminating the req

1989-07-05

1991-10-15

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072966, 3072967, 307359, 307494, 331111, 328127, H03K 301, H03K 5153, H03K 326, G06G 712

Patent

active

050577077

ABSTRACT:
A charge pump includes a feedback circuit coupled between the input and output of a driving buffer the latter of which sinks and sources current through a pump capacitor during respective charge and discharge phases. First and second switching diodes are serially coupled between a source of operating potential and an output terminal to isolate each from the other. The pump capacitor alternately sinks current through the first switching diode during the charge phase and sources current though the second switching diode during the dischrge phase. A dynamic voltage is developed at the output of the buffer encompassing first and second predetermined voltage levels corresponding to completion of the charge and discharge phases of the pump capacitor accordingly. The feedback circuit, responsive to the dynamic voltage, complements the drive direction of a buffer to substantially eliminating the timing mismatches between the feedback circuit and the charging rate of the pump capacitor.

REFERENCES:
patent: 3656000 (1972-04-01), Neathery, Jr.
patent: 4607238 (1986-08-01), Kohsiek
patent: 4716302 (1987-12-01), Flannagan et al.
patent: 4796174 (1989-01-01), Nadd

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