SWITCH CIRCUIT

• US 20130169346A1
• Filed: 09/10/2012
• Published: 07/04/2013
• Est. Priority Date: 12/28/2011
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: TSUKAHARA, Yoshihiro
• Granted Patent: US 8,653,880 B2
• Time in Patent Office: Days
• US Class Current: 327/419
• CPC Class Codes: H03K 17/693 Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors logic circuits H03K19/00; code converters H03M5/00, H03M7/00

Abstract

A switch circuit includes: first, second, and third input-output terminals; a first switching element connected between the first and second input-output terminals; a second switching element connected between the third input-output terminal and a grounding point; a third switching element connected between the first and third input-output terminals; a fourth switching element connected between the second input-output terminal and the grounding point; a first control voltage applying terminal connected to control terminals of the first and second switching elements; a second control voltage applying terminal connected to control terminals of the third and fourth switching elements; first and second resistors connected between the control terminals of the first and second switching elements and the first control voltage applying terminal, respectively; and first and second diodes connected in parallel with the first and second resistors, respectively, and having cathodes connected to the first control voltage applying terminal.

Claims

1. A switch circuit comprising:

first, second, and third input-output terminals;

a first switching element connected between the first input-output terminal and the second input-output terminal;

a second switching element connected between the third input-output terminal and a grounding point;

a third switching element connected between the first input-output terminal and the third input-output terminal;

a fourth switching element connected between the second input-output terminal and the grounding point;

a first control voltage applying terminal connected to control terminals of the first and second switching elements;

a second control voltage applying terminal connected to control terminals of the third and fourth switching elements;

a first resistor connected between the control terminal of the first switching element and the first control voltage applying terminal;

a second resistor connected between the control terminal of the second switching element and the first control voltage applying terminal; and

first and second diodes connected in parallel with the first and second resistors, respectively, the first and second diodes having cathodes connected to the first control voltage applying terminal.

2. The switch circuit according to claim 1, further comprising:

a third resistor connected between the control terminal of the third switching element and the second control voltage applying terminal;

a fourth resistor connected between the control terminal of the fourth switching element and the second control applying terminal; and

third and fourth diodes connected in parallel with the third and fourth resistors, respectively, the third and fourth diodes having cathodes connected to the second control voltage applying terminal.

3. The switch circuit according to claim 1, further comprising first and second inductors connected in parallel with the first and second resistors respectively and connected in series to the first and second diodes respectively.

4. The switch circuit according to claim 2, further comprising first, second, third, and fourth inductors connected in parallel with the first, second, third, and fourth resistors respectively and connected in series to the first, second, third, and fourth diodes respectively.

5. The switch circuit according to claim 1, further comprising:

first and second transmission lines having a length of one-quarter wavelength of signals passing through the switch circuit and connected between the first and second diodes and the grounding point, respectively; and

first and second capacitors connected in series to the first and second transmission lines, respectively.

6. The switch circuit according to claim 2, further comprising:

first, second, third, and fourth transmission lines having a length of one-quarter wavelength of signals passing through the switch circuit and connected between the first, second, third, and fourth diodes and the grounding point, respectively; and

first, second, third, and fourth capacitors connected in series to the first, second, third, and fourth transmitting lines, respectively.

7. A switch circuit comprising:

first, second, and third input-output terminals;

a first switching element connected between the first input-output terminal and the second input-output terminal;

a second switching element connected between the third input-output terminal and a grounding point;

a third switching element connected between the first input-output terminal and the third input-output terminal;

a fourth switching element connected between the second input-output terminal and the grounding point;

a first control voltage applying terminal connected to control terminals of the first and second switching elements;

a second control voltage applying terminal connected to control terminals of the third and fourth switching elements;

a first resistor connected between a joining point of the control terminals of the first and second switching elements and the first control voltage applying terminal; and

a first diode connected in parallel with the first resistor and having a cathode connected to the first control voltage applying terminal.

8. The switch circuit according to claim 7, further comprising:

a second resistor connected between a joining point of the control terminals of the third and fourth switching elements and the second control voltage applying terminal; and

a second diode connected in parallel with the second resistor and having a cathode connected to the second control voltage applying terminal.

9. The switch circuit according to claim 7, further comprising an inductor connected in parallel with the first resistor and connected in series to the first diode.

10. The switch circuit according to claim 8, further comprising first and second inductors connected in parallel with the first and second resistors respectively, and connected in series to the first and second diodes respectively.