Charge pump having pull-up circuit operating with two clock puls

Details Charge pump having pull-up circuit operating with two clock puls Charge pump having pull-up circuit operating with two clock puls

1990-06-20

1991-11-19

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072965, 307269, 307590, 307601, 307264, 307482, H03K 301, H03K 513, H03K 1901, H03L 500

Patent

active

050668706

ABSTRACT:
A charge pump comprises a charge-up circuit connected to a voltage source, and a clock generator. A pull-up circuit is formed by an enhancement mode MOSFET and a time constant circuit. The MOSFET has its drain coupled to the charge-up circuit and its source connected to the output terminal of the charge pump. The clock generator produces first and second clock pulse sequences, with the duration of the first clock pulse sequence being greater than the pulse duration of the second clock pulse sequence. The time constant circuit has two capacitors and a resistor connected therebetween to respond to the first and second clock pulse sequences by successively applying voltages to the drain and gate of the MOSFET. The charge-up circuit is formed by a depletion mode or an enhancement mode MOSFET which is responsive to one or more clock pulse sequences with pulses preceding those of the first and second clock sequences.

REFERENCES:
patent: 3938109 (1976-02-01), Gionis et al.
patent: 4500799 (1985-02-01), Sud et al.
patent: 4570244 (1986-02-01), Sud et al.
patent: 4970409 (1990-11-01), Wada et al.
patent: 5010259 (1991-04-01), Inoue et al.

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