Importance

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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.

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First Claim