High voltage switch circuit for semiconductor device
View Patent ↗Provided is concerned with a high voltage switch circuit for a semiconductor device, which rapidly discharges a gate voltage of a pass transistor through an additional discharge transistor during inactivation of itself in the circuit structure with a positive feedback loop for transferring an internal high voltage without a voltage drop by applying an enough voltage to the gate of the pass transistor. The high voltage switch circuit prevents the internal high voltage from decreasing.
1. A high voltage switch circuit of a semiconductor device, said high voltage switch circuit comprising:
a control node from which a control voltage signal is generated;
a first transistor transferring a first high voltage signal in response to the control voltage signal;
an input circuit transferring a predetermined precharge voltage to the control node in response to a switch control signal;
a positive feedback loop transferring a second high voltage to the control node in response to the control voltage signal;
first and second capacitors for boosting a voltage of the control voltage signal and the second high voltage of the positive feedback loop, respectively; and
a second transistor connected to the control node and discharging the control voltage signal in response to the switch control signal.
2. The high voltage switch circuit according to claim 1 , wherein the input circuit is comprised of a third transistor serially connected between the control node and an input terminal receiving the switch control signal, the third transistor being driven by a power supply voltage.
3. The high voltage switch circuit according to claim 1 , wherein the positive feedback loop comprises:
fourth and fifth transistors serially connected between the control node and an input terminal of the second high voltage, wherein said fourth and fifth transistors being driven by the control voltage signal and the second high voltage boosted by the second capacitor, respectively; and
first and second diodes connected between the control node and the input terminal receiving the second high voltage for adjusting the voltage of the control voltage control signal.