Radio frequency switch circuit

Patent metadata

Field	Value
Publication number	US-2016285449-A1
Application number	US-201514954521-A
Country	US
Kind code	A1
Filing date	Nov 30, 2015
Priority date	Mar 25, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

A radio frequency switch circuit, according to examples, includes a switching circuit controlled to be in a turned on or turned off state on the basis of a gate signal to thereby allow a radio frequency signal to pass or be blocked; a voltage dividing circuit connected to terminals of the switching circuit that the radio frequency signal passes through and outputting intermediate voltage between the terminals by a voltage dividing node; and an impedance circuit connected between the voltage dividing node and a body terminal of the switching circuit.

First claim

What is claimed is:

1 . A radio frequency switch circuit, comprising a first switch circuit connected between a signal port and an antenna port and operated by a gate signal, wherein the first switch circuit comprises:
a switching circuit controlled to be in a turned on or turned off state on the basis of the gate signal to thereby allow a radio frequency signal to pass or be blocked; a voltage dividing circuit connected to terminals of the switching unit that the radio frequency signal passes through and configured to output intermediate voltage between the terminals by a voltage dividing node; and an impedance circuit connected between the voltage dividing node and a body terminal of the switching circuit.

2 . The radio frequency switch circuit of claim 1 , wherein the voltage dividing circuit comprises a first resistor and a second resistor connected to each other in series, and
the first resistor and the second resistor have different levels of resistance.

3 . The radio frequency switch circuit of claim 2 , wherein the impedance circuit comprises a body capacitor connected between a node between the first resistor and the second resistor and the body terminal of the switching circuit.

4 . The radio frequency switch circuit of claim 1 , wherein the switching circuit comprises first switches connected to each other in series, and
the impedance circuit is connected between the voltage dividing node of the voltage dividing circuit and a body terminal of a first switch of the first switches.

5 . The radio frequency switch circuit of claim 4 , wherein the first switches comprise:
field effect transistors (FETs) connected to each other in series through source terminals and drain terminals of the FETs; gate resistors connected to gate terminals of the FETs, respectively; and body resistors connected to body terminals of the FETs, respectively.

6 . The radio frequency switch circuit of claim 4 , wherein a first switch of the first switches that is connected to the impedance circuit is provided in a position closer to the antenna port as compared to a first switch of the first switches that is not connected to the impedance circuit.

7 . The radio frequency switch circuit of claim 1 , further comprising a second switch circuit connected between the signal port and a ground and operated by a second gate signal, comprising a second switching circuit,
wherein the second switching circuit is controlled to be in a turned on or turned off state on the basis of the second gate signal to allow the radio frequency signal to pass or be blocked.

8 . The radio frequency switch circuit of claim 7 , wherein the second switch circuit further comprises:
a second voltage dividing circuit connected to terminals through which the radio frequency signal from the second switching circuit passes; and a second impedance unit connected between a voltage dividing node of the second voltage dividing circuit and a body terminal of the second switching circuit.

9 . The radio frequency switch circuit of claim 7 , wherein the second switching circuit comprises second switches connected to each other in series, and
the second switch circuit further comprises: a second voltage dividing circuit connected between terminals through which the radio frequency signal from the second switches passes; and a second impedance circuit connected between a voltage dividing node of the second voltage dividing circuit and a body terminal of a second switch of the second switches.

10 . A radio frequency switch circuit, comprising:
a first switch circuit connected between a signal port and an antenna port and operated by a first gate signal; and a second switch circuit connected between the signal port and a ground and operated by a second gate signal, wherein the second switch circuit comprises a second switching circuit controlled to be in a turned on or turned off state on the basis of the second gate signal to thereby allow a radio frequency signal to pass or be blocked, a second voltage dividing circuit connected to terminals of the second switching unit which the radio frequency signal passes through and outputting intermediate voltage between the terminals by a voltage dividing node, and a second impedance circuit connected between the voltage dividing node and a body terminal of the second switching circuit.

11 . The radio frequency switch circuit of claim 10 , wherein the second voltage dividing circuit comprises a first inductor and a second inductor connected to each other in series and having different levels of inductance, and
the second impedance circuit comprises a body capacitor connected between a node between the first inductor and the second inductor and the body terminal of the second switching circuit.

12 . The radio frequency switch circuit of claim 10 , wherein the second switching circuit comprises second switches connected to each other in series, and
the second impedance circuit is connected between the voltage dividing node of the second voltage dividing circuit and a body terminal of a second switch of the second switches.

13 . The radio frequency switch circuit of claim 12 , wherein the first switches comprise:
field effect transistors (FETs) connected to each other in series through source terminals and drain terminals of the FETs; gate resistors connected to gate terminals of the FETs, respectively; and body resistors connected to body terminals of the FETs, respectively.

14 . The radio frequency switch circuit of claim 12 , wherein a second switch of the second switches that is connected to the second impedance circuit is provided in a position closer to the signal port as compared with a second switch of the second switches that is not connected to the second impedance circuit.

15 . The radio frequency switch circuit of claim 10 , wherein the second voltage dividing circuit comprises variable impedance switches connected to each other in series and having levels of impedance changed by a control signal, and
the second impedance circuit comprises a body capacitor connected between a node between the variable impedance switches and the body terminal of the switching circuit.

Assignees

• Samsung Electro Mech

Inventors

• Yoo Hyun Jin
• Kim Jong Myeong
• Kim Yoo Hwan
• Yoo Hyun Hwan
• Na Yoo Sam
• Jang Dae Seok

Classifications

• H03K17/687 Primary

  the devices being field-effect transistors · CPC title

• H03K17/693 Primary

  Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors (logic circuits H03K19/00; code converters H03M5/00, H03M7/00) · CPC title

• H03K17/6871

  the output circuit comprising more than one controlled field-effect transistor · CPC title

• H04B1/44

  Transmit/receive switching · CPC title