Electronic switching circuit using junction type field-effect transistor

• US 4,158,149 A
• Filed: 11/08/1977
• Issued: 06/12/1979
• Est. Priority Date: 05/16/1977
• Status: Expired due to Term

• Current Assignee: Hitachi Denshi Kabushiki Kaisha
• Original Assignee: Hitachi Denshi Kabushiki Kaisha
• Inventors: Otofuji, Kiyoshi
• Primary Examiner(s): Anagnos, Larry N.
• Application Number:
  US05/849,646
• Time in Patent Office: 581 Days
• Field of Search: 307/200 B, 307/251, 307/304, 307/352, 307/353, 328/151, 328/165, 328/167
• US Class Current: 327/430
• CPC Class Codes: H03K 17/687 the devices being field-effect transistors

Abstract

In an electronic switching circuit using a junction type field-effect transistor, a capacitor is connected between the gate electrode of the transistor and a control pulse source. The capacitor is cooperative with a rectifying action of the gate electrode of the transistor to supply to the gate of the transistor a switching voltage which is different from the potential level of the control pulse from the control pulse source and is DC-restored following an input signal applied to the transistor.

Claims

1. An electronic switching circuit comprising:

a junction type field-effect transistor as a switching element having a first electrode for receiving an input signal, a second electrode for delivering an output signal and a gate electrode; and

a capacitor connected to form the only connection path between the gate electrode of said transistor and a control pulse source which generates control pulses, said capacitor being cooperative with a rectifying action of the gate electrode of said transistor to supply to the gate electrode of said transistor a switching voltage which is different from the potential level of said control pulse and is DC-restored following said input signal.

2. An electronic switching circuit according to claim 1, wherein the amplitude of said control pulse is greater than the pinch-off voltage of said transistor.

3. An electronic switching circuit according to claim 1, wherein said control pulses are a train of regular pulses having a constant period.

4. An electronic switching circuit according to claim 1, further comprising a resistor having one end connected with the gate electrode of said transistor and the other end connected with a source of a voltage higher than said input signal.

5. An electronic switching circuit according to claim 1, wherein said capacitor stores a charge during the period when a control pulse is generated and said stored charge prevents the junction type field-effect transistor from being gated on during periods when a control pulse is not generated.