# US 2021/0281284 A1 · Receiver and receiver controlling method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0281284 A1 - Document ID: US20210281284A1 - Status: Published application - Kind: A1 - Application number: 16/480,554 - Filed: 2017-11-08 - Published: 2021-09-09 - Earliest claimed: 2017-02-20 - Assignees: Sony Semiconductor Solutions Corporation - Applicants: Sony Semiconductor Solutions Corporation - Inventors: Nobuhisa OZAWA; Naoto YOSHIKAWA - Web page: https://patentgrep.com/patent/US20210281284A1 ## CPC - H04B 1/0032: {with analogue quadrature frequency conversion to and from the baseband (quadrature modulators and demodulators per se H03D3/007, H03C3/40)} - H04B 1/30: for homodyne or synchrodyne receivers (demodulator circuits H03D1/22) - H04B 1/1607: {Supply circuits (converters H02M; filters therefor H02M1/14; voltage stabilisers G05F1/46)} - H04B 1/163: {Special arrangements for the reduction of the damping of resonant circuits of receivers (amplifiers H03F; negative impedance networks for line transmission systems H04B3/16)} - H04B: TRANSMISSION ## Abstract In a receiver that demodulates a received signal, deterioration of signal quality is suppressed. A current output unit generates and outputs, from a voltage signal, a current signal including a predetermined offset current in a low-frequency component between a high-frequency component having a frequency higher than a predetermined frequency and the low-frequency component having a frequency lower than the predetermined frequency. A demodulation unit demodulates the high-frequency component. A filter circuit passes, in the current signal, the high-frequency component from a current output unit to the demodulation unit, and causes the low-frequency component to flow from the current output unit to a predetermined reference potential point. ## Claims ### Claim 1 A receiver comprising: a current output unit configured to generate and output, from a voltage signal, a current signal including a predetermined offset current in a low-frequency component between a high-frequency component having a frequency higher than a predetermined frequency and the low-frequency component having a frequency lower than the predetermined frequency; a demodulation unit configured to demodulate the high-frequency component; and a filter circuit configured to cause, in the current signal, the high-frequency component to pass from the current output unit to the demodulation unit and cause, in the current signal, the low-frequency component to flow from the current output unit to a predetermined reference potential point. ### Claim 2 (depends on 1) The receiver according to claim 1, wherein the filter circuit causes the low-frequency component to flow via an impedance component having a smaller value as the frequency of the current signal is lower. ### Claim 3 (depends on 2) The receiver according to claim 2, wherein the impedance component includes an inductance component and a resistor component connected between a signal line wired from the current output unit to the demodulation unit and the predetermined reference potential point. ### Claim 4 (depends on 3) The receiver according to claim 3, wherein the filter circuit is an active inductor. ### Claim 5 (depends on 3) The receiver according to claim 3, wherein the filter circuit is a bias circuit including an operational amplifier to which an input terminal and an output terminal are connected. ### Claim 6 (depends on 1) The receiver according to claim 1, wherein the current signal is a differential signal including a positive side signal and a negative side signal, and the filter circuit includes a positive side filter circuit causing, in the positive side signal, the high-frequency component to pass from the current output unit to the demodulation unit, and a negative side filter circuit causing, in the negative side signal, the high-frequency component to pass from the current output unit to the demodulation unit. ### Claim 7 (depends on 1) The receiver according to claim 1, wherein the demodulation unit includes a mixing unit configured to mix the high-frequency component with a predetermined local signal and output a mixed signal, and a current voltage conversion unit configured to perform current voltage conversion for the mixed signal and output a voltage signal. ### Claim 8 (depends on 7) The receiver according to claim 7, wherein the local signal includes an in-phase side local signal and a quadrature-side local signal having a phase different by 90 degrees from the in-phase side local signal, and the mixing unit includes an in-phase side mixer that mixes the high-frequency component with the in-phase side local signal, and outputs an in-phase side mixed signal, and a quadrature side mixer that mixes the high-frequency component with the quadrature side local signal and outputs a quadrature side mixed signal. ### Claim 9 (depends on 8) The receiver according to claim 8, wherein the current voltage conversion unit includes an in-phase side current voltage conversion unit that performs current voltage conversion for the in-phase side mixed signal, and a quadrature side current voltage conversion unit that performs current voltage conversion for the quadrature side mixed signal. ### Claim 10 (depends on 8) The receiver according to claim 8, wherein the current output unit includes an in-phase side current output unit and a quadrature side current output unit that output the current signal, and the filter circuit includes an in-phase side filter circuit that causes the high-frequency component to pass from the in-phase side current output unit to the in-phase side mixer, and a quadrature side filter circuit that causes the high-frequency component to pass from the quadrature side current output unit to the quadrature side mixer. ### Claim 11 (depends on 10) The receiver according to claim 10, wherein the current signal is a differential signal including a positive side signal and a negative side signal, the in-phase side filter circuit includes an in-phase positive side filter circuit that causes, in the positive side signal, the high-frequency component to pass from the current output unit to the demodulation unit, and an in-phase negative side filter circuit that causes, in the negative side signal, the high-frequency component to pass from the current output unit to the demodulation unit, and the quadrature side filter circuit includes a quadrature positive side filter circuit that causes, in the positive side signal, the high-frequency component to pass from the current output unit to the demodulation unit, and a quadrature negative side filter circuit that causes, in the negative side signal, the high-frequency component to pass from the current output unit to the demodulation unit. ### Claim 12 A receiver controlling method comprising: a current output process of generating and outputting, from a voltage signal, a current signal including a predetermined offset current in a low-frequency component between a high-frequency component having a frequency higher than a predetermined frequency and the low-frequency component having a frequency lower than the predetermined frequency; a demodulation process of demodulating the high-frequency component; and a filtering process of causing the high-frequency component in the current signal to pass from the current output unit to the demodulation unit and causing the low-frequency component in the current signal to flow from the current output unit to a predetermined reference potential point.