Very high voltage switch

• US 6,380,793 B1
• Filed: 10/27/2000
• Issued: 04/30/2002
• Est. Priority Date: 10/28/1999
• Status: Expired due to Fees

• Current Assignee: Pixtech SA
• Original Assignee: Pixtech SA
• Inventors: Peyron, Philippe, Bancal, Bernard
• Primary Examiner(s): Tran, Toan
• Assistant Examiner(s): NGUYEN, LONG T
• Application Number:
  US09/698,376
• Time in Patent Office: 550 Days
• Field of Search: 327/108, 327/112, 327/427, 327/434, 327/436, 327/379, 327/384, 327/309, 327/310, 327/581, 327/389, 327/374, 327/377, 327/376, 327/325, 326/83, 326/87
• US Class Current: 327/427
• CPC Class Codes: H03K 17/102 in field-effect transistor switches
• CPC Class Codes: H03K 17/6871 the output circuit comprising more than one controlled field-effect transistor

Abstract

A push-pull switch including a first N-channel MOS transistor, the drain-source path of which is connected between a high voltage terminal and an output terminal, a first resistor connected between the gate of the first transistor and the high voltage, a diode having its anode connected to the output terminal and its cathode connected to the gate of the first transistor, a second N-channel MOS transistor having its drain connected to the cathode of the diode, its source connected to a reference potential, and its gate connected to a control terminal, and a second resistor connected between the gate of the second transistor and the output terminal.

Claims

1. A push-pull switch comprising:

a first N-channel MOS transistor (M1), wherein a drain-source path of which is connected between a voltage terminal (10) and an output terminal (13);

a first resistor (20) connected between the gate of the first N-channel MOS transistor and the high voltage terminal;

a diode (D) having its anode connected to the output terminal (13) and its cathode connected to the gate of the first N-channel MCS transistor;

a second N-channel MOS transistor (M2) having its drain connected to the cathode of the diode, its source connected to a reference potential, and its gate connected to a control terminal; and

a second resistor (40) connected between the gate of the second N-channel MOS transistor and the output terminal (13).

2. The push-pull switch of claim 1, wherein each of the N-channel MOS transistors has its source connected to its substrate.

3. The push-pull switch of claim 1, further including a third resistor (30) having a first terminal connected to the gate of the second N-channel MOS transistor, and a second terminal connected to the second resistor and to a first terminal of a protection diode (Z) having its second terminal connected to the reference potential.