SWITCHING CIRCUIT, RADIO SWITCHING CIRCUIT, AND SWITCHING METHOD THEREOF

• US 20140125402A1
• Filed: 03/14/2013
• Published: 05/08/2014
• Est. Priority Date: 11/08/2012
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chen, Cheng-Chung
• Application Number:
  US13/803,278
• Publication Number:
  US 20140125402A1
• Time in Patent Office: Days
• US Class Current: 327/427
• 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
• CPC Class Codes: H03K 2217/0054 Gating switches, e.g. pass gates

Abstract

The present disclosure discloses a radio frequency switching circuit including an antenna terminal, a transmitter terminal, a receiver terminal, a first switching module, a second switching module, a first switching component, and a second switching component. The first switching module is connected between the antenna terminal and the transmitter terminal. The second switching module is connected between the antenna terminal and the receiver terminal. The first and second switching modules include several transistors respectively, and each of the transistors includes a gate terminal, a drain terminal, a source terminal, and a bulk. The first switching component has a first anode terminal connecting with the gate terminal, and a first cathode terminal connecting with the drain terminal. The second switching component has a second anode terminal connecting with the gate terminal, and a second cathode terminal connecting with the source terminal.

Claims

1. A switching circuit comprising:

a transistor including a gate terminal, a drain terminal, a source terminal, and a bulk;

a first switching component having a first anode terminal and a first cathode terminal, wherein the first anode terminal is connected with the gate terminal, and the first cathode terminal is connected with the drain terminal; and

a second switching component having a second anode terminal and a second cathode terminal, wherein the second anode terminal is connected with the gate terminal, and the second cathode terminal is connected with the source terminal.

2. The switching circuit according to claim 1, further comprising a first resistor, wherein the first resistor is connected between the bulk of the transistor and a system ground terminal.

3. The switching circuit according to claim 1, further comprising a second resistor electrically connected to the gate terminal of the transistor.

4. The switching circuit according to claim 1, wherein the first switching component and/or the second switching component is a diode connected transistor.

5. The switching circuit according to claim 1, wherein the first switching component and/or the second switching component is a parasitic diode between the bulk and the source terminal or the drain terminal of the transistor, and the first anode terminal of the first switching component and the second anode of the second switching component and the gate terminal are connected through a switch circuit.

6. A radio frequency switching circuit comprising:

an antenna terminal;

a transmitter terminal;

a receiver terminal;

a first switching module connected between the antenna terminal and the transmitter terminal; and

a second switching module connected between the antenna terminal and the receiver terminal;

wherein the second switching module includes a plurality of switching modules, and each of the switching modules has;

a transistor including a gate terminal, a drain terminal, a source terminal, and a bulk;

a first switching component having a first anode terminal and a first cathode terminal, wherein the first anode terminal is connected with the gate terminal, and the first cathode terminal is connected with the drain terminal; and

a second switching component having a second anode terminal and a second cathode terminal, wherein the second anode terminal is connected with the gate terminal, and the second cathode terminal is connected with the source terminal.

7. The radio frequency switching circuit according to claim 6, further comprising a plurality of first resistors, wherein each of the first resistors is correspondingly connected between the bulk of each of the transistors and a system ground terminal.

8. The radio frequency switching circuit according to claim 6, further comprising a plurality of second resistors, wherein each of the second resistors is correspondingly connected with the gate terminal of each of the transistors.

9. The radio frequency switching circuit according to claim 6, wherein the first switching component and/or the second switching component is a diode connected transistor.

10. The radio frequency switching circuit according to claim 6, wherein the first switching component and/or the second switching component is a parasitic diode between the bulk and the source terminal or the drain terminal of the transistor.

11. The radio frequency switching circuit according to claim 10, further comprising a switch circuit electrically connected between the first anode terminal of the first switching component and the second anode terminal of the second switching component and the gate terminal of the transistor.

12. The radio frequency switching circuit according to claim 6, wherein the first switching module includes a first transistor.

13. The radio frequency switching circuit according to claim 7, further comprising a third switching module connected between the transmitter terminal and the system ground terminal, wherein the third switching module includes a plurality of switching modules in the second switching module.

14. The radio frequency switching circuit according to claim 7, further comprising a fourth switching module connected between the receiver terminal and the system ground terminal, wherein the fourth switching module includes a second transistor.

15. The radio frequency switching circuit according to claim 7, further comprising a first switch circuit, a second switch circuit, a third switch circuit, and a fourth switch circuit, wherein the first switch circuit is connected between the second switching module and the receiver terminal, the second switch circuit is connected between the second switching module and the antenna terminal, the third switch circuit is connected between a third switching module and the transmitter terminal, and the fourth switch circuit is connected between a fourth switching module and the system ground terminal.

16. A switching method of a radio frequency switching circuit, comprising:

providing a first switching path, wherein the first switching path is electrically connected between a gate terminal and a drain terminal of a transistor;

providing a second switching path, wherein the second switching path is electrically connected between the gate terminal and a source terminal of the transistor;

providing an alternating-current radio frequency signal, wherein the alternating-current radio frequency signal is defined by a positive period part waveform and a negative period part waveform;

the second switching path turning on responding to the positive period part waveform of the alternating-current radio frequency signal, the first switching path becoming a high impedance status responding to the positive period part waveform of the alternating-current radio frequency signal; and

the first switching path being conducted responding to the negative period part waveform of the alternating current radio frequency signal, the second switching path considered as a high impedance responding to the negative period part waveform of the alternating-current radio frequency signal.