# US 10,312,863 B2 · Amplifying circuit and associated receiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,863 B2 - Document ID: US10312863B2 - Status: Granted - Kind: B2 - Application number: 16/151,353 - Filed: 2018-10-04 - Published: 2019-05-02 - Granted: 2019-06-04 - Earliest claimed: 2017-10-31 - Assignees: Realtek Semiconductor Corp. - Applicants: Realtek Semiconductor Corp. - Inventors: Chia-Jun Chang; Ka-Un Chan - Web page: https://patentgrep.com/patent/US10312863B2 ## CPC - H03F 1/0205: {in transistor amplifiers} - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H03G 1/0088: {using discontinuously variable devices, e.g. switch-operated} - H03F 2200/294: the amplifier being a low noise amplifier [LNA] - H03F 2203/45526: the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC - H03F 2203/7236: the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers by (a ) switch(es) - H03G 3/3052: {in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver (H03G3/32, H03G3/34 take precedence)} - H03F: AMPLIFIERS - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H03G: CONTROL OF AMPLIFICATION ## Abstract An amplifying circuit includes a first gain adjusting circuit, a second gain adjusting circuit, a load circuit and a switch module. When the amplifying circuit operates in a first mode, the first gain adjusting circuit receives a first input signal, and generates a first output signal to a second output terminal of the amplifying circuit via the load circuit and the switch module; and when the amplifying circuit operates in a second mode, the second gain adjusting circuit receives a second input signal, and generates a second output signal to a first output terminal of the amplifying circuit via the load circuit and the switch module. ## Claims ### Claim 1 An amplifying circuit, comprising: a first output terminal and a second output terminal; a first gain adjusting circuit; a second gain adjusting circuit; a loading circuit; and a switching circuit, coupled to the first gain adjusting circuit, the second gain adjusting circuit, the loading circuit, the first output terminal and the second output terminal of the amplifying circuit; wherein when the amplifying circuit operates in a first operating mode, the first gain adjusting circuit receives a first input signal, and transmits a first output signal to the second output terminal of the amplifying circuit via the switching circuit and the loading circuit, and the first output signal is not transmitted to the first output terminal at this point; and when the amplifying circuit operates in a second operating mode, the second gain adjusting circuit receives a second input signal, and transmits a second output signal to the first output terminal via the switching circuit and the loading circuit, and the second output signal is not transmitted to the second output terminal at this point. ### Claim 2 (depends on 1) The amplifying circuit of claim 1, wherein a phase of the first output signal generated by the first gain adjusting circuit is the same as a phase of the first input signal, and a phase of the second output signal generated by the second gain adjusting circuit is the same as a phase of the second input signal. ### Claim 3 (depends on 2) The amplifying circuit of claim 2, wherein the first gain adjusting circuit is a capacitor, and the second gain adjusting circuit is a source follower. ### Claim 4 (depends on 1) The amplifying circuit of claim 1, wherein when the amplifying circuit operates in the first operating mode, the second output signal generated by the second gain adjusting circuit is not received by the first output terminal and the second output terminal of the amplifying circuit; and when the amplifying circuit operates in the second operating mode, the first output signal generated by the first gain adjusting circuit is not received by the first output terminal and the second output terminal of the amplifying circuit. ### Claim 5 (depends on 1) The amplifying circuit of claim 1, wherein the loading circuit comprises a first terminal and a second terminal, and the switching circuit comprises: a first switch, arranged to selectively connect the first output signal generated by the first gain adjusting circuit to the first terminal of the loading circuit; a second switch, arranged to selectively connect the first terminal of the loading circuit to the first output terminal of the amplifying circuit; a third switch, arranged to selectively connect the second terminal of the loading circuit to the second output terminal of the amplifying circuit; and a fourth switch, arranged to selectively connect the second output signal generated by the second gain adjusting circuit to the second terminal of the loading circuit. ### Claim 6 (depends on 5) The amplifying circuit of claim 5, wherein when the amplifying circuit operates in the first operating mode, the first switch and the third switch are activated while the second switch and the fourth switch are deactivated; and when the amplifying circuit operates in the second operating mode, the first switch and the third switch are deactivated while the second switch and the fourth switch are activated. ### Claim 7 (depends on 1) The amplifying circuit of claim 1, wherein one of two terminals of a side coil of a transformer connects to the first output terminal of the amplifying circuit, and the other of the two terminals connects to the second output terminal of the amplifying circuit. ### Claim 8 (depends on 1) The amplifying circuit of claim 1, wherein the amplifying circuit is a low noise amplifier installed within a receiver. ### Claim 9 A receiver, comprising: a matching circuit; a low noise amplifier, coupled to the matching circuit, comprising: a first output terminal and a second output terminal; a first gain adjusting circuit; a second gain adjusting circuit; a loading circuit; and a switching circuit, coupled to the first gain adjusting circuit, the second gain adjusting circuit, the loading circuit, the first output terminal and the second output terminal of the low noise amplifier; wherein when the low noise amplifier operates in a first operating mode, the first gain adjusting circuit receives a first input signal from an antenna via the matching circuit, and transmits a first output signal to the second output terminal of the low noise amplifier via the switching circuit and the loading circuit, and the first output signal is not transmitted to the first output terminal; and when the low noise amplifier operates in a second operating mode, the second gain adjusting circuit receives a second input signal from the antenna via the matching circuit, and transmits a second output signal to the first output terminal of the low noise amplifier via the switching circuit and the loading circuit, and the second output signal is not transmitted to the second output terminal; and a transformer wherein one of two terminals of a side coil of the transformer connects to the first output terminal of the low noise amplifier, and the other of the two terminals connects to the second output terminal of the low noise amplifier. ### Claim 10 (depends on 9) The receiver of claim 9, wherein a phase of the first output signal generated by the first gain adjusting circuit is the same as a phase of the first input signal, and a phase of the second output signal generated by the second gain adjusting circuit is the same as a phase of the second input signal.