A power amplifier module includes a first bipolar transistor configured to amplify a radio frequency signal and output an amplified signal and a second bipolar transistor A base of the second bipolar transistor is supplied with a control voltage for controlling attenuation of the radio frequency signal, and a collector the second bipolar transistor is supplied with a source voltage The power amplifier module also includes a first resistor, where one end of the first resistor is connected to a supply path of the radio frequency signal to the first bipolar transistor, and a capacitor, where one end of the capacitor is connected to the other end of the first resistor and the other end of the capacitor is connected to the collector of the second bipolar transistor

Power amplifier module

The invention discloses an electrostatic protection device and method of a display panel and the display device, the electrostatic protection device comprises a detection circuit, a discharge circuitand a release end, and the detection circuit is connected with a driving chip of the display panel; the discharging circuit is connected with the detection circuit and the driving chip; The release end is connected with the discharge circuit and the detection circuit; When certain static electricity is generated at the output end of the driving chip; the detection circuit can detect static electricity from the output end of the driving chip; at the moment, the detection circuit responds; OPENING DISCHARGE CIRCUIT, a driver chip, the discharge circuit and the release end are conducted temporarily; Static electricity is released from the driving chip to the releasing end through the discharging circuit. When the electrostatic discharge of the display panel is finished, the detection circuitresponds to close the discharge circuit to disconnect the driving chip and the discharge end, so that even if high-energy or continuous electrostatic discharge occurs, the electrostatic protection device of the display panel can be prevented from being damaged, and the protection performance and reliability of the electrostatic protection device are improved.

Electrostatic protection device and method of display panel and display device

The invention discloses an ESD (electrostatic discharge) protection circuit. The ESD protection circuit comprises a switch unit and a Darlington unit, wherein the input end of the switch unit is used as the input end of the ESD protection circuit; the first output end of the switch unit is used as the output end of the ESD protection circuit; the first input end of the Darlington unit is connected with the second output end of the switch unit; the second input end of the Darlington unit is connected with the input end of the switch unit; and the output end of the Darlington unit is connected with the first output end of the switch unit. According to the ESD protection circuit, the starting speed of the ESD protection circuit can be improved, the stability of clamp voltage of the ESD protection circuit is improved, influence of the ESD protection circuit on circuit impendence matching is lowered, the average power of the ESD protection circuit is lowered, and the stability of the ESD protection circuit is improved.

ESD (electrostatic discharge) protection circuit

The invention provides an antistatic protection circuit of a radio frequency chip high-power amplifier. The antistatic protection circuit comprises a PA core circuit, a PA output matching circuit, an ESD protection circuit and a power switch circuit; the power switch circuit is connected with the PA output matching circuit; the ESD protection circuit comprises a diode D1, a diode D2, a MOS tube N3 and a MOS tube N4; the anode of the diode D1 is grounded, and the cathode of the diode D1 is connected with the drain of the MOS tube N3 through the diode D2; the source of the MOS tube N3 is connected with the drain of the MOS tube N4, the source of the MOS tube N4 is grounded; the grid of the MOS tube N3 is connected with a power supply VDD, the cathode of the diode D2 is connected with the power supply VDD by orderly passing through the diodes D3 to D9 in a forward direction; the grid of the MOS tube N4 is connected with the power switch circuit; the cathode of the diode D1 is connected with the PA core circuit, and the cathode of the diode D1 is connected with the PA output matching circuit through the PAD1. The antistatic protection circuit of the radio frequency chip high-power amplifier provided by the invention has the advantages of being scientific in design, strong in practicability, simple in structure, high in EDS performance and low in cost.

Antistatic protection circuit of radio frequency chip high-power amplifier

Electrostatic protection structure based on Si-Ge process platform

An ESD protection circuit, which is coupled between either an I/O pad or a power pad and a ground terminal, includes a non-snapback device and a snapback device. When the voltage across the non-snapback device is not less than the non-snapback trigger voltage, the non-snapback device is turned on. When the voltage across the snapback device is not less than the snapback trigger voltage, the snapback device is turned on, and the voltage across the snapback device is held at the snapback holding voltage, in which the snapback holding voltage is less than the snapback trigger voltage. The non-snapback device and the snapback device are cascaded.

Yeh-Ning Jou

Papers

ESD protection circuits