Single phase differential conversion circuit, balun, switch, and communication device

Patent metadata

Field	Value
Publication number	US-9621139-B2
Application number	US-201314394660-A
Country	US
Kind code	B2
Filing date	May 14, 2013
Priority date	May 28, 2012
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Provided with one or more first transistors of a first conductivity type each including a gate, a source, and a drain, the gate being connected to an input terminal, the source being configured to be connected to a first voltage source, the drain being connected to an output node, one or more second transistors of a second conductivity type each including a gate, a source, and a drain, the gate being connected to the input terminal, the source being configured to be connected to a second voltage source, the drain being connected to the output node, a first resistor that is inserted and connected between the input terminal and the output node, a first output terminal that is connected to the input terminal, and a second output terminal that is directly or indirectly connected to the output node.

First claim

The invention claimed is:

1. A balun, comprising:
one or more first transistors of a first conductivity type each including a first gate, a first source, and a first drain, wherein the first gate is connected to an input terminal, the first source is connected to a first voltage source, and the first drain is connected to an output node;
one or more second transistors of a second conductivity type each including a second gate, a second source, and a second drain, wherein the second gate is connected to the input terminal, the second source is connected to a second voltage source, and the second drain is connected to the output node;
a first resistor directly connected between the input terminal and the output node, wherein the output node is configured to form a junction of the first drain of the one or more first transistors and the second drain of the one or more second transistors;
a first output terminal connected to the input terminal; and
a second output terminal directly or indirectly connected to the output node.

2. A switch configured to control a balun, the switch comprising:
one or more switching transistors each including a control terminal, wherein the one or more switching transistors are configured to select at least one of one or more first transistors of a first conductivity type or one or more second transistors of a second conductivity type; and
a nonlinear circuit configured to be respectively connected to the control terminal of each of the one or more switching transistors,
wherein the balun comprises:
the one or more first transistors each including a first gate, a first source, and a first drain, wherein the first gate is connected to an input terminal, the first source is connected to a first voltage source and the first drain is connected to an output node;
the one or more second transistors each including a second gate, a second source, and a second drain, wherein the second gate is connected to the input terminal, the second source is connected to a second voltage source, and the second drain is connected to the output node;
a first resistor connected between the input terminal and the output node, wherein the output node is configured to form a junction of the first drain of the one or more first transistors and the second drain of the one or more second transistors;
a first output terminal connected to the input terminal; and
a second output terminal directly or indirectly connected to the output node.

3. The switch according to claim 2 ,
wherein the one or more switching transistors include an N-type transistor, and
impedance of the nonlinear circuit decreases with an increase in a voltage of the control terminal.

4. The switch according to claim 2 ,
wherein the one or more switching transistors include a P-type transistor, and
impedance of the nonlinear circuit increases with an increase in a voltage of the control terminal.

5. The switch according to claim 2 ,
wherein the nonlinear circuit includes a transistor.

6. The switch according to claim 5 ,
wherein the transistor includes a gate, a drain, and a source, and
one of the drain, the source, or the gate are connected to each other.

7. The switch according to claim 6 ,
wherein the transistor is a P-type transistor, and
the control terminal is connected to another of the drain or the source of the transistor.

8. The switch according to claim 6 ,
wherein the transistor is an N-type transistor, and
the control terminal is connected to one of the drain or the source of the transistor.

9. The switch according to claim 7 ,
wherein each of the one or more switching transistors is configured to be turned on and off based on a voltage applied to a terminal, among the drain and the source of the transistor of the nonlinear circuit, that is disconnected from the control terminal.

10. The switch according to claim 2 ,
wherein the control terminal of each of the one or more switching transistors is a gate of the respective one or more switching transistors.

11. The switch according to claim 2 ,
wherein the control terminal of each of the one or more switching transistors is a back gate of the respective one or more switching transistors.

12. The switch according to claim 2 ,
wherein the nonlinear circuit includes a diode.

13. The switch according to claim 2 ,
wherein the nonlinear circuit includes a variable resistance circuit configured to vary a resistance value of the non-linear circuit based on a voltage at the control terminal.

Assignees

• Sony Corp

Inventors

• Yoshikawa Naoto
• Yamamoto Ken

Classifications

• H03K2217/0054

  Gating switches, e.g. pass gates · CPC title

• H03K17/163

  Soft switching · CPC title

• H03K17/165

  by feedback from the output circuit to the control circuit · CPC title

• H03K2217/0018

  Special modifications or use of the back gate voltage of a FET · CPC title

• H03K5/023 Primary

  using field effect transistors · CPC title