Charge pump switch circuits

Details Charge pump switch circuits Charge pump switch circuits

1994-06-30

1996-07-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Accelerating switching

327377, 327437, 327103, H03K 1704

Patent

active

055370721

ABSTRACT:
A switch circuit for a charge pump circuit is disclosed. The switch circuit has a first transistor for conducting current and is controlled by a second, third, and fourth transistor. The second transistor protects the first transistor for excessive gate-to-drain voltage. The third transistor receives the signal for switching the switch circuit and also serves as a cascoding transistor for protecting the fourth transistor from excessive gate-to-drain voltage. Consequently, the switch circuit can withstand high gate-to-drain voltages and has increased reliability. The switch also has a turn-off circuit to facilitate the depletion of charge on the control element of the first transistor. The switch circuit also has a zener diode to insure that excessive voltage is not applied across the gate-to drain of the first transistor.

REFERENCES:
patent: 4347445 (1982-08-01), Baker
patent: 4347447 (1982-08-01), Proebsting
patent: 4677325 (1987-06-01), Einzinger et al.
patent: 4890010 (1989-12-01), Neudeck et al.
patent: 4922403 (1990-05-01), Feller
patent: 5034875 (1991-07-01), Hattori
patent: 5051881 (1991-09-01), Herold
patent: 5095223 (1992-03-01), Thomas
patent: 5132895 (1992-07-01), Kase
patent: 5180929 (1993-01-01), Kokubun

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