Radio frequency switch circuit

A radio frequency switch and circuit technology, applied in electronic switches, electrical components, pulse technology, etc., can solve problems such as unbalanced voltage distribution

Active Publication Date: 2017-02-22
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the development of modern radar and radio communication technologies, various electronic devices have continuously put forward higher requirements for the RF switch circuits used in their internal applications or system tests. One of the important points is that the existing RF switch circuits make the voltage distribution uneven. balance, which seriously af

Method used

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Embodiment 1

[0031] The invention provides a radio frequency switch circuit, the specific structure is as figure 2 As shown, it includes a transistor chain composed of M transistors connected for controlling radio frequency signals in an electronic circuit, and is characterized in that it also includes a resistor chain, which includes M first resistors connected in series: A resistance R 1 , The second first resistor R 2 ...M-1 first resistor R M-1 And the M-th first resistor R M . There are M connection points (not shown in the figure) on the resistor chain, which are distributed on the same side of each first resistor, and there is at least one first resistor between any two connection points;

[0032] M second resistors, the substrate of each transistor in the transistor chain is sequentially connected to the M connection points on the resistor chain through a different second resistor.

[0033] Specifically, both ends of the resistance chain are grounded, as shown in the figure, that is, t...

Embodiment 2

[0041] The invention provides a radio frequency switch circuit, the specific structure is as image 3 As shown, it includes a transistor chain composed of M transistors connected for controlling radio frequency signals in an electronic circuit, and is characterized in that it further includes: a first resistance chain including N first resistors connected in series: A 1 , A 2 ...A N . There are N connection points on the first resistor chain, which are distributed on the same side of each first resistor, and there is at least one first resistor between any two connection points;

[0042] A second resistance chain, the second resistance chain including M-N first resistances connected in series: B 1 , B 2 ...B M-N There are M-N connection points on the second resistance chain, which are distributed on the same side of each first resistance, and there is at least one first resistance between any two connection points (M> N);

[0043] M second resistors, please refer to image 3 , Th...

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Abstract

The invention provides a radio frequency switch circuit comprising a transistor chain composed of M connected transistors, wherein the radio frequency switch circuit further comprises a resistor chain composed of M first resistors connected in series, M connecting points are arranged on the resistor chain, and substrates of the M transistors are sequentially connected to the M connecting points through different second resistors. The invention further provides another radio frequency switch circuit comprising a first resistor chain composed of M first resistors connected in series and a second resistor chain composed of M-N first resistors connected in series, wherein N connecting points are arranged on the first resistor chain, M-N connecting points are arranged on the second resistor chain, the substrates of previous N transistors in the transistor chain are sequentially connected to the N connecting points through a different second resistor, and the substrates of latter M-N transistors are sequentially connected to the M-N connecting points through a different second resistor. The two radio frequency switch circuits can reduce the maximum voltage difference between the source electrodes and the drain electrodes of the transistors, so that the voltage distribution on the transistors is more uniform.

Description

Technical field [0001] The invention relates to the technical field of semiconductor circuits, in particular to a radio frequency switch circuit. Background technique [0002] The radio frequency switch is one of the control devices used to control the radio frequency signal transmission path and signal size. It has a wide range of applications in many fields such as wireless communication, electronic countermeasures, radar systems, and electronic measuring instruments. [0003] The existing radio frequency switch circuit is composed of M transistors, such as figure 1 As shown, from left to right are the first transistor 1, the second transistor 2, the third transistor 3... the M-1 transistor M-1 and the M transistor M, respectively. The drain of the first transistor 1 is used as the input terminal of the radio frequency switch circuit, and its source is connected to the drain of the second transistor 2; the source of the second transistor 2 is connected to the drain of the third t...

Claims

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Application Information

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IPC IPC(8): H03K17/081
CPCH03K17/081
Inventor 刘张李
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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