# US 10,763,789 B2 · Mixer for reducing local frequency signal generated at output of the mixer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,763,789 B2 - Document ID: US10763789B2 - Status: Granted - Kind: B2 - Application number: 16/740,317 - Filed: 2020-01-10 - Published: 2020-07-16 - Granted: 2020-09-01 - Earliest claimed: 2019-01-10 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Kihyun Kim; Daehyun Kang; Hyunchul Park; Kyuhwan An; Jaesik Jang - Web page: https://patentgrep.com/patent/US10763789B2 ## CPC - H03D 7/12: by means of semiconductor devices having more than two electrodes (H03D7/14 - H03D7/22 take precedence) - H03D 7/1483: {comprising components for selecting a particular frequency component of the output} - H03D 2200/0023: Balun circuits - H03D 2200/009: Reduction of local oscillator or RF leakage - H03D: DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K9/00; transforming types of pulse modulation H03K11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B7/14; demodulators adapted for AC systems of digital information transmission H04L27/00; synchronous demodulators adapted for colour television H04N9/66) ## Abstract The disclosure relates to a communication method and system for converging a 5G communication system for supporting higher data rates beyond a 4G system with an IoT technology. The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety-related services. The disclosure provides a mixer including a first impedance connected in parallel to a mixer output transformer and configured to remove a primary local frequency component generated at an output of the mixer, and a second impedance connected in parallel to the mixer output transformer and configured to remove a secondary local frequency component generated at the output of the mixer, wherein the first impedance operates as a series resonator in a primary local frequency band, and the second impedance operates as a parallel resonator in a secondary local frequency band. ## Claims ### Claim 1 A mixer transforming a frequency using a local frequency, the mixer comprising: a first impedance connected in parallel to a mixer output transformer and configured to remove a primary local frequency component generated at an output of the mixer; and a second impedance connected in parallel to the mixer output transformer and configured to remove a secondary local frequency component generated at the output of the mixer, wherein the first impedance operates as a series resonator in a primary local frequency band, and the second impedance operates as a parallel resonator in a secondary local frequency band. ### Claim 2 (depends on 1) The mixer of claim 1, wherein the first impedance comprises a first inductor and a first capacitor connected in series to the first inductor, and an impedance value of the first impedance in the primary local frequency band is lower than a first predetermined reference value. ### Claim 3 (depends on 1) The mixer of claim 1, wherein the second impedance comprises a second capacitor, and an impedance value of the second impedance in the secondary local frequency band is higher than a second predetermined reference value. ### Claim 4 (depends on 1) The mixer of claim 1, wherein the first impedance or the second impedance comprises a stub or a metal line, and an impedance value of the first impedance in the primary local frequency band is lower than a first predetermined reference value, and an impedance value of the second impedance in the secondary local frequency band is higher than a second predetermined reference value. ### Claim 5 (depends on 1) The mixer of claim 1, wherein the first impedance comprises at least one capacitor group and a second inductor, and the at least one capacitor group includes a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the at least one capacitor group. ### Claim 6 (depends on 1) The mixer of claim 1, wherein the first impedance comprises: a first capacitor group including a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the first capacitor group; a third inductor electrically connected to one end of the first capacitor group; and a second capacitor group including a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the second capacitor group, and electrically connected to one end of the third inductor. ### Claim 7 (depends on 6) The mixer of claim 6, wherein the second impedance comprises a third capacitor group including a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the third capacitor group. ### Claim 8 (depends on 1) The mixer of claim 1, wherein the first impedance includes: a first transistor having capacitance characteristics being changed in accordance with a first control voltage; a fourth inductor electrically connected to one end of the first transistor; and a second transistor electrically connected to one end of the fourth inductor, and having capacitance characteristics being changed in accordance with the first control voltage, and the second impedance includes: a third transistor having capacitance characteristics being changed in accordance with a second control voltage; and a fourth transistor electrically connected to one end of the third transistor, and having capacitance characteristics being changed in accordance with the second control voltage. ### Claim 9 (depends on 8) The mixer of claim 8, wherein the first control voltage is supplied to the first transistor and the second transistor through a first resistor having a specific value, and the second control voltage is supplied to the third transistor and the fourth transistor through a second resistor having a specific value. ### Claim 10 (depends on 1) The mixer of claim 1, wherein the first impedance includes: a first varactor having capacitance characteristics being changed in accordance with a third control voltage; a fifth inductor electrically connected to one end of the first varactor; and a second varactor electrically connected to one end of the fifth inductor, and having capacitance characteristics being changed in accordance with the third control voltage, and the second impedance includes: a third varactor having capacitance characteristics being changed in accordance with a fourth control voltage; and a fourth varactor electrically connected to one end of the third varactor, and having capacitance characteristics being changed in accordance with the fourth control voltage. ### Claim 11 An electronic device including a mixer transforming a frequency using a local frequency, the mixer comprising: a first impedance connected in parallel to a mixer output transformer and configured to remove a primary local frequency component generated at an output of the mixer; and a second impedance connected in parallel to the mixer output transformer and configured to remove a secondary local frequency component generated at the output of the mixer, wherein the first impedance operates as a series resonator in a primary local frequency band, and the second impedance operates as a parallel resonator in a secondary local frequency band. ### Claim 12 (depends on 11) The electronic device of claim 11, wherein the first impedance comprises a first inductor and a first capacitor connected in series to the first inductor, and an impedance value of the first impedance in the primary local frequency band is lower than a first predetermined reference value. ### Claim 13 (depends on 11) The electronic device of claim 11, wherein the second impedance comprises a second capacitor, and an impedance value of the second impedance in the secondary local frequency band is higher than a second predetermined reference value. ### Claim 14 (depends on 11) The electronic device of claim 11, wherein the first impedance or the second impedance comprises a stub or a metal line, and an impedance value of the first impedance in the primary local frequency band is lower than a first predetermined reference value, and an impedance value of the second impedance in the secondary local frequency band is higher than a second predetermined reference value. ### Claim 15 (depends on 11) The electronic device of claim 11, wherein the first impedance comprises at least one capacitor group and a second inductor, and the at least one capacitor group includes a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the at least one capacitor group. ### Claim 16 (depends on 11) The electronic device of claim 11, wherein the first impedance comprises: a first capacitor group including a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the first capacitor group; a third inductor electrically connected to one end of the first capacitor group; and a second capacitor group including a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the second capacitor group, and electrically connected to one end of the third inductor. ### Claim 17 (depends on 16) The electronic device of claim 16, wherein the second impedance comprises a third capacitor group including a plurality of capacitors connected in parallel to one another and switches connected in series corresponding to respective capacitors of the third capacitor group. ### Claim 18 (depends on 11) The electronic device of claim 11, wherein the first impedance includes: a first transistor having capacitance characteristics being changed in accordance with a first control voltage; a fourth inductor electrically connected to one end of the first transistor; and a second transistor electrically connected to one end of the fourth inductor, and having capacitance characteristics being changed in accordance with the first control voltage, and the second impedance includes: a third transistor having capacitance characteristics being changed in accordance with a second control voltage; and a fourth transistor electrically connected to one end of the third transistor, and having capacitance characteristics being changed in accordance with the second control voltage. ### Claim 19 (depends on 18) The electronic device of claim 18, wherein the first control voltage is supplied to the first transistor and the second transistor through a first resistor having a specific value, and the second control voltage is supplied to the third transistor and the fourth transistor through a second resistor having a specific value. ### Claim 20 (depends on 11) The electronic device of claim 11, wherein the first impedance includes: a first varactor having capacitance characteristics being changed in accordance with a third control voltage; a fifth inductor electrically connected to one end of the first varactor; and a second varactor electrically connected to one end of the fifth inductor, and having capacitance characteristics being changed in accordance with the third control voltage, and the second impedance includes: a third varactor having capacitance characteristics being changed in accordance with a fourth control voltage; and a fourth varactor electrically connected to one end of the third varactor, and having capacitance characteristics being changed in accordance with the fourth control voltage.