Radio frequency antenna switch

• US 10,090,834 B2
• Filed: 03/21/2018
• Issued: 10/02/2018
• Est. Priority Date: 04/22/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Yang, Jinger, Chi, Yusong, Fan, Jinhan
• Primary Examiner(s): Liao, Hsin-Chun
• Application Number:
  US15/927,570
• Publication Number:
  US 20180212601A1
• Time in Patent Office: 195 Days
• CPC Class Codes: H03K 17/102 in field-effect transistor switches
• CPC Class Codes: H03K 17/145 in field-effect transistor switches
• CPC Class Codes: H03K 17/6871 the output circuit comprising more than one controlled field-effect transistor
• 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: H04B 1/48 in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter H04B1/46 takes precedence

Abstract

A radio frequency antenna switch includes an antenna port, a radio frequency signal port, and at least one branch connected to the antenna port or the radio frequency signal port, where each branch includes multiple transistors which are connected in a stacked manner. Each transistor in the multiple transistors has a multi-finger structure, comprising at least one first finger used as a source and at least one second finger used as a drain. Each first finger is connected, using multiple first vias, to a source corresponding to the first finger, and each second finger is connected, using multiple second vias, to a drain corresponding to the second finger. The number of the first vias and the number of the second vias of a preset number of transistors in the multiple transistors progressively decrease in a direction away from the antenna port.

Claims

1. A radio frequency antenna switch, comprising:

an antenna port configured to receive or transmit a radio frequency signal;

a radio frequency signal port configured to receive the radio frequency signal from the antenna port or send the radio frequency signal to the antenna port; and

at least one branch coupled to the antenna port or the radio frequency signal port,

wherein each branch in the at least one branch includes multiple transistors,

wherein the multiple transistors are coupled in a stacked manner,

wherein each branch selectively couples or decouples the antenna port with the radio frequency signal port under an action of a control signal,

wherein each transistor in the multiple transistors has a multi-finger structure comprising at least one first finger used as a source and at least one second finger used as a drain,

wherein each first finger is coupled to a common source point,

wherein each second finger is coupled to a common drain point,

wherein each first finger is coupled, using multiple first vias, to a source corresponding to the first finger,

wherein each second finger is coupled, using multiple second vias, to a drain corresponding to the second finger,

wherein a number of the first vias and a number of the second vias of a preset number of transistors in the multiple transistors progressively decrease in a direction away from the antenna port, and

wherein the preset number is less than or equal to a total number of the multiple transistors.

2. The switch according to claim 1, wherein when the preset number is less than the total number of the multiple transistors, at least one other transistor and a transistor that is in the multiple transistors and is the farthest away from the antenna port have a same number of the first vias and a same number of the second vias, and wherein the at least one other transistor is not included in the preset number of transistors in the multiple transistors.

3. The switch according to claim 1, wherein a gate of each transistor in the multiple transistors is coupled to a gate resistor corresponding to the gate, wherein a body of each transistor is coupled to a body resistor corresponding to the body, and wherein resistance values of the gate resistors and the body resistors that correspond to the preset number of transistors progressively decrease in a direction away from the antenna port.

4. The switch according to claim 1, wherein a decreasing degree of the number of the first vias and a decreasing degree of the number of the second vias of the preset number of transistors increase with an increase in a number of the at least one branch.

5. A system comprising:

an amplifier; and

a radio frequency antenna switch coupled to the amplifier,

wherein the radio frequency antenna switch comprises;

an antenna port configured to receive or transmit a radio frequency signal;

a radio frequency signal port configured to receive the radio frequency signal from the antenna port or send the radio frequency signal to the antenna port; and

at least one branch coupled to the antenna port or the radio frequency signal port,

wherein each branch in the at least one branch includes multiple transistors,

wherein the multiple transistors are coupled in a stacked manner,

wherein each branch selectively couples or decouples the antenna port with the radio frequency signal port under an action of a control signal,

wherein each transistor in the multiple transistors has a multi-finger structure comprising at least one first finger used as a source and at least one second finger used as a drain,

wherein each first finger is coupled to a common source point,

wherein each second finger is coupled to a common drain point,

wherein each first finger is coupled, using multiple first vias, to a source corresponding to the first finger,

wherein each second finger is coupled, using multiple second vias, to a drain corresponding to the second finger,

wherein a number of the first vias and a number of the second vias of a preset number of transistors in the multiple transistors progressively decrease in a direction away from the antenna port,

wherein the preset number is less than or equal to a total number of the multiple transistors, and

wherein the amplifier is coupled to the radio frequency signal port.

6. The system according to claim 5, wherein when the preset number is less than the total number of the multiple transistors, at least one other transistor and a transistor that is in the multiple transistors and is the farthest away from the antenna port have a same number of the first vias and a same number of the second vias, and wherein the at least one other transistor is not included in the preset number of transistors in the multiple transistors.

7. The system according to claim 5, wherein a gate of each transistor in the multiple transistors is coupled to a gate resistor corresponding to the gate, wherein a body of each transistor is coupled to a body resistor corresponding to the body, and wherein resistance values of the gate resistors and the body resistors that correspond to the preset number of transistors progressively decrease in a direction away from the antenna port.

8. The system according to claim 5, wherein a decreasing degree of the number of the first vias and a decreasing degree of the number of the second vias of the preset number of transistors increase with an increase in a number of the at least one branch.

9. The system according to claim 5, wherein the amplifier comprises a power amplifier.

10. The system according to claim 5, wherein the amplifier comprises a low noise amplifier.

11. The system according to claim 5, wherein the system further comprises an antenna coupled to the antenna port.