# US 9,520,847 B2 · Switching amplifier and transmitter using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,847 B2 - Document ID: US9520847B2 - Status: Granted - Kind: B2 - Application number: 14/398,299 - Filed: 2013-04-05 - Published: 2015-03-26 - Granted: 2016-12-13 - Earliest claimed: 2012-05-25 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Shinichi Hori - Web page: https://patentgrep.com/patent/US9520847B2 ## CPC - H03F 3/2171: {with field-effect devices (H03F3/2173 - H03F3/2178 take precedence)} - H03F 1/0216: {Continuous control} - H03F 1/0244: {Stepped control} - H03F 3/193: with field-effect devices (H03F3/195 takes precedence) - H03F 3/2173: {of the bridge type} - H03F 3/245: {with semiconductor devices only} - H03K 17/687: the devices being field-effect transistors - H03F 3/217: Class D power amplifiers; Switching amplifiers - H03F 2200/171: A filter circuit coupled to the output of an amplifier - H03F 2200/324: An amplitude modulator or demodulator being used in the amplifier circuit - H03F 2200/336: A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit - H03F 2200/405: the output amplifying stage of an amplifier comprising more than three power stages - H03F: AMPLIFIERS - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## Abstract The present invention is applied to a switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together, and a high-side driver and a low-side driver that drive the first high-side gate and the first low-side gate, respectively. In the switching amplifier of the present invention, the high-side driver includes an input switching amplifier that uses the output terminal of the first high-side gate as a power source. ## Claims ### Claim 1 A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein: said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source; and said high-side driver further includes a relay amplifier having an input terminal connected to an output terminal of said input switching amplifier and an output terminal connected to an input terminal of said first high-side gate. ### Claim 2 (depends on 1) The switching amplifier as set forth in claim 1, wherein said relay amplifier is an inverter series in which a plurality of inverters are cascade-connected. ### Claim 3 (depends on 1) The switching amplifier as set forth in claim 1, wherein said high-side driver further comprises: a diode having its anode terminal connected to the ground terminal of said relay amplifier and its cathode terminal connected to the output terminal of said input switching amplifier; and a capacitor having one terminal connected to the ground terminal of said relay amplifier and the other terminal connected to the output terminal of said first high-side gate. ### Claim 4 (depends on 1) The switching amplifier as set forth in claim 1, wherein a power-source terminal and ground terminal of said relay amplifier are each connected to a respective output terminal of the two output terminals of a DC-DC converter. ### Claim 5 (depends on 4) The switching amplifier as set forth in claim 4, wherein said high-side driver further includes a diode having its anode terminal connected to a ground terminal of said relay amplifier and its cathode terminal connected to an output terminal of said input switching amplifier. ### Claim 6 (depends on 1) The switching amplifier as set forth in claim 1, wherein said input switching amplifier includes a resistor and an internal amplifier element, and said resistor is connected between the output terminal of said first high-side gate and the output terminal of said internal amplifier element. ### Claim 7 (depends on 1) The switching amplifier as set forth in claim 1, comprising a plurality of sets of said first high-side gate and said high-side driver. ### Claim 8 (depends on 1) A transmitter that uses the switching amplifier as set forth in claim 1. ### Claim 9 A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein: said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source; wherein said input switching amplifier includes a resistor and an internal amplifier element, and said resistor is connected between the output terminal of said first high-side gate and the output terminal of said internal amplifier element; and said input switching amplifier further includes an inductor, and said inductor is connected in a series with said resistor. ### Claim 10 A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein: said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source; and said first high-side gate, said first low-side gate, said high-side driver, and said low-side driver form a first buffer circuit; the switching amplifier further comprising: a second high-side gate having an input terminal connected to an output terminal of said first buffer circuit; and a second low-side gate; wherein said second high-side gate and said second low-side gate have output terminals that are connected together. ### Claim 11 (depends on 10) The switching amplifier as set forth in claim 10, comprising a plurality of sets of said second high-side gate and said first buffer circuit. ### Claim 12 A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein: said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source; the switching amplifier further comprising: two sets, each set being made up by said first high-side gate, said first low-side gate, said high-side driver, and said low-side driver, one set forming a first buffer circuit and the other set forming a second buffer circuit; a second high-side gate having an input terminal connected to an output terminal of said first buffer circuit; and a second low-side gate having an input terminal connected to an output terminal of said second buffer circuit; wherein said second high-side gate and said second low-side gate have output terminals that are connected together.