Richwave Technology Corp.

Ching-Yao Pai

Chuan-Chen Chao

Yu-Hung Chen

A transistor stack circuit including a first signal transmission port, a second signal transmission port, an impedance unit, a plurality of transistors, and a plurality of resistors is provided. The transistors are connected in series and coupled between the first signal transmission port and the second signal transmission port. A first terminal of each resistor is coupled to a common path. A second terminal of each resistor is coupled to a control terminal of a corresponding transistor among the transistors. The impedance unit is coupled between the common path and a reference voltage terminal. When an electrostatic discharge event occurs, an impedance value of the impedance unit is greater than twice of a resistance value of each resistor, and the transistors form a low-impedance path.

Transistor stack circuit

A radio frequency switch circuit includes a series circuit. The series circuit includes a first series connection group and a second series connection group. The first series connection group includes a plurality of first transistors. The second series connection group includes a plurality of second transistors. Control terminals of the first transistors are all coupled to a first control node. Control terminals of the second transistors are all coupled to a second control node. When an electrostatic discharge event occurs, a voltage at the first control node is different from a voltage at the second control node. In a normal operation state, a switch state of the first series connection group and a switch state of the second series connection group are the same as each other.

Radio frequency switch circuit

An integrated circuit includes a signal pad, receiving an input signal during a normal mode, and receive an ESD signal during an ESD mode; an internal circuit, processing the input signal during the normal mode; a variable impedance circuit, comprising a first end coupled to the signal pad, a second end coupled to the internal circuit, wherein the variable impedance circuit provides a low or high impedance path between the signal pad and the internal circuit during the normal or ESD mode; and a switch circuit, comprising a first end coupled to a control end of the variable impedance circuit, a second end coupled to a reference voltage terminal, and a control end receiving a node voltage, wherein the switch circuit switches the control end of the variable impedance circuit to have a first specific voltage or be electrically floating during the normal or ESD mode.

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Taipei, Taiwan

Ching-Yao Pai