# US 9,520,838 B2 · Inverter type power amplifier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,838 B2 - Document ID: US9520838B2 - Status: Granted - Kind: B2 - Application number: 14/836,972 - Filed: 2015-08-27 - Published: 2016-03-03 - Granted: 2016-12-13 - Earliest claimed: 2014-09-01 - Assignees: Soongsil University Research Consortium Techno-Park - Applicants: Soongsil University Research Consortium Techno-Park - Inventors: Jong Hoon Park; Chang Hyun Lee; Chang Kun Park - Web page: https://patentgrep.com/patent/US9520838B2 ## CPC - H03F 1/342: {in field-effect transistor amplifiers} - H03F 1/223: {with MOSFET's} - H03F 3/195: in integrated circuits - H03F 3/245: {with semiconductor devices only} - H03F 3/3028: {with symmetrical driving of the end stage} - H03F 2200/408: the output amplifying stage of an amplifier comprising three power stages - H03F 2200/411: the output amplifying stage of an amplifier comprising two power stages - H03F 2203/30031: A resistor being coupled as feedback circuit in the SEPP amplifier - H03F: AMPLIFIERS ## Abstract The present disclosure relates to an inverter type power amplifier. An exemplary embodiment of the present disclosure provides an inverter type power amplifier including: a first transistor including a gate to which an AC type of input signal is applied through an input port, a first terminal connected a power source voltage, and a second terminal connected to an output port; a second transistor including a gate through which the input signal is applied thereto, a first terminal connected to a ground, and a second terminal connected to the output port; a feedback resistor including a first terminal connected to the input port and a second terminal connected to the output port; and an AC blocking block including a first terminal connected to the output port and a second terminal connected to a DC output port. ## Claims ### Claim 1 An inverter type power amplifier comprising: a first stage of power amplifier comprising a first transistor, a second transistor and a feedback resistor, wherein the feedback resistor comprises a first terminal connected to an input port and a second terminal connected to an output port; a second stage of power amplifier comprising a first transistor, a second transistor and a feedback resistor, wherein the feedback resistor comprises a first terminal connected to an input port and a second terminal connected to an output port, and the second stage of power amplifier is connected to the first stage of power amplifier in series; a third stage of power amplifier comprising a first transistor and a second transistor, wherein the third stage of power amplifier is connected to the second stage of power amplifier in series; a first AC blocking block comprising a first terminal connected to the output port of the first stage of power amplifier and a second terminal connected to the first transistor of the third stage of power amplifier; and a second AC blocking block comprising a first terminal connected to the output port of the second stage of power amplifier and a second terminal connected to the second transistor of the third stage of power amplifier. ### Claim 2 (depends on 1) The inverter type power amplifier of claim 1, wherein the output port of the first stage of power amplifier is connected a DC blocking block. ### Claim 3 (depends on 1) The inverter type power amplifier of claim 1, wherein the second terminal of the first AC blocking block is connected to a gate of the first transistor of the third stage of power amplifier, and the second terminal of the second AC blocking block is connected to a gate of the second transistor of the third stage of power amplifier. ### Claim 4 (depends on 1) The inverter type power amplifier of claim 1, wherein the first AC blocking block or the second AC blocking block comprises a resistor. ### Claim 5 (depends on 1) The inverter type power amplifier of claim 1, wherein each of the first transistors of the first, second and third stage of power amplifier is a p-type MOSFET, each of the second transistors of the first, the second and the third stage of power amplifier is an n-type MOSFET, each of the first terminals of the first transistors and the second transistors is a source, and each of the second terminals of the first transistors and the second transistors is a drain. ### Claim 6 (depends on 1) The inverter type power amplifier of claim 1, wherein each of the first transistors of the first, second and third stage of power amplifier is a p-type MOSFET, each of the second transistors of the first, second and third stage of power amplifier is a n-type MOSFET, each of the first terminals of the first transistors and the second transistors is a source, and each of the second terminals of the first transistors and the second transistors is a drain. ### Claim 7 An inverter type power amplifier comprising: a first stage of power amplifier comprising a first transistor, a second transistor and a feedback resistor, wherein the feedback transistor comprises a first terminal connected to an input port and a second terminal connected to an output port; a second stage of power amplifier comprising a first transistor, a second transistor and a feedback resistor, wherein the feedback resistor comprises a first terminal connected to an input port and a second terminal connected to an output port, and the second stage of power amplifier is connected to the first stage of power amplifier in series; a third stage of power amplifier comprising a first transistor and a second transistor, wherein the third stage of power amplifier is connected to the second stage of power amplifier in series; a first AC blocking block comprising a first terminal connected to the input port of the first stage of power amplifier and a second terminal connected to the first transistor of the third stage of power amplifier; and a second AC blocking block comprising a first terminal connected to the input port of the second stage of power amplifier and a second terminal connected to the second transistor of the third stage of power amplifier. ### Claim 8 (depends on 7) The inverter type power amplifier of claim 7, wherein the output port of the first stage of power amplifier is connected a DC blocking block. ### Claim 9 (depends on 7) The inverter type power amplifier of claim 7, wherein the second terminal of the first AC blocking block is connected to a gate of the first transistor of the third stage of power amplifier, and the second terminal of the second AC blocking block is connected to a gate of the second transistor of the third stage of power amplifier. ### Claim 10 (depends on 7) The inverter type power amplifier of claim 7, wherein the first AC blocking block or the second AC blocking block comprises a resistor. ### Claim 11 (depends on 7) The inverter type power amplifier of claim 7, wherein each of the first transistors of the first, second and third stage of power amplifier is a p-type MOSFET, each of the second transistors of the first, second and third stage of power amplifier is a n-type MOSFET, each of the first terminals of the first transistors and the second transistors is a source, and each of the second terminals of the first transistors and the second transistors is a drain. ### Claim 12 (depends on 7) The inverter type power amplifier of claim 7, wherein each of the first transistors of the first, second and third stage of power amplifier is a PNP-type BJT, each of the second transistors of the first, second and third stage of power amplifier is a NPN-type BJT, each of the first terminals of the first transistors and the second transistors is an emitter, and each of the second terminals of the first transistors and the second transistors is a collector. ### Claim 13 An inverter type power amplifier comprising: a first transistor including a gate to which an AC type of input signal is applied through an input port, a first terminal of the first transistor connected a power source voltage, and a second terminal of the first transistor connected to a first output port; a second transistor including a gate through which the input signal is applied thereto, a first terminal of the second transistor connected to a ground, and a second terminal of the second transistor connected to the first output port; a feedback resistor including a first terminal connected to the input port and a second terminal connected to the first output port; and an AC blocking block including a first terminal and a second terminal, the first terminal of the AC blocking block connected to the first output port and the second terminal of the AC blocking block connected to a second output port, wherein the AC blocking block blocks alternating current (AC) applied to the gate of the first transistor through the input port and only direct current (DC) is outputted to the second output port without additional bias circuit.