Semiconductor switch having plural resonance circuits therewith

• US 6,011,450 A
• Filed: 10/09/1997
• Issued: 01/04/2000
• Est. Priority Date: 10/11/1996
• Status: Expired due to Term

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: NEC Corporation
• Inventors: Miya, Tatsuya
• Primary Examiner(s): LEE, BENNY T
• Application Number:
  US08/948,812
• Time in Patent Office: 817 Days
• Field of Search: 333/103, 333/104, 333/101, 333/262, 327/493, 327/495
• US Class Current: 333/103
• CPC Class Codes: H01P 1/15 by semiconductor devices

Abstract

Disclosed is a semiconductor switch which has: a first resonance circuit which is composed so that a variable capacitance element and an inductor are in series connected and a series circuit composed of an inductor and a capacitor are in parallel connected to the variable capacitance element and the inductor, the first resonance circuit having one end connected to an input terminal and the other end connected to a first output terminal; a second resonance circuit which is composed like the first resonance circuit and is grounded to the first output terminal; a third resonance circuit which is composed like the first resonance circuit and is connected to the input terminal in parallel with the first resonance circuit, the third resonance circuit having a second output terminal on the reverse side of the input terminal; and a fourth resonance circuit which is composed like the first resonance circuit and is grounded to the second output terminal.

Claims

1. A semiconductor switch having an input terminal, a first output terminal and a second output terminal, comprising:

a plurality of resonance circuits, each said resonance circuit including (a) a respective variable capacitance element and a corresponding inductor connected in series and (b) a respective circuit composed of an inductor and a capacitor in series and connected in parallel with corresponding ones of said series variable capacitance element and said inductor,

a first resonance circuit of said plurality of resonance circuits having one end thereof connected to said input terminal and another end thereof connected to said first output terminal;

a second resonance circuit of said plurality of resonance circuits being connected between a ground and said first output terminal;

a third resonance circuit of said plurality of resonance circuits being connected at one end thereof to said input terminal and at another end thereof connected to said second output terminal;

a fourth resonance circuit of said plurality of resonance circuits connected between said ground and said second output terminal;

wherein said first through fourth resonance circuits having respective resonance characteristics whereby a signal applied to said input terminal is selectably output at said first output at said first output terminal for first capacitance values of said respective variable capacitance elements and said signal is selectably output at said second output terminal for second capacitance values of said respective variable capacitance elements.

2. A semiconductor switch having an input terminal, a first output terminal and a second output terminal, comprising:

a plurality of resonance circuits, each said resonance circuits including (a) a respective variable capacitance element and a corresponding inductor connected in series and (b) a respective series circuit composed of an inductor and a capacitor in series and connected in parallel with corresponding ones of said series variable capacitance element and said inductor,

a first resonance circuit of said plurality of resonance circuits having one end thereof connected to said input terminal and another end thereof connected to said first output terminal;

a second resonance circuit of said plurality of resonance circuits being connected at one end thereof to said input terminal and at another end thereof connected to said second output terminal; and

said first and second resonance circuits having respective resonance characteristics whereby a signal applied to said input terminal is selectably output at said first output terminal for first capacitance values of said respective variable capacitance elements and said signal is selectably output at said second output terminal for second capacitance values of said respective variable capacitance elements.

3. A semiconductor switch as in claim 2, further comprising a first resistor connected between said first output terminal and a ground, and a second resistor connected between said second output terminal and said ground.