# US 9,520,834 B2 · Quadrature mixer arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,834 B2 - Document ID: US9520834B2 - Status: Granted - Kind: B2 - Application number: 14/896,390 - Filed: 2013-06-10 - Published: 2016-05-05 - Granted: 2016-12-13 - Earliest claimed: 2013-06-10 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget L M Ericsson (publ) - Inventors: Lars Sundstrom; Staffan Ek; Jim Svensson - Web page: https://patentgrep.com/patent/US9520834B2 ## CPC - H03D 7/14: Balanced arrangements - H03D 3/009: {Compensating quadrature phase or amplitude imbalances} - H03D 7/166: {using two or more quadrature frequency translation stages} - H03D 7/18: Modifications of frequency-changers for eliminating image frequencies {(H03D7/16 takes precedence)} - H04L 27/364: {Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels} - H04L 27/365: {Modulation using digital generation of the modulated carrier (not including modulation of a digitally generated carrier)} - H04L 27/3863: {Compensation for quadrature error in the received signal} - 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) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A quadrature mixer arrangement is disclosed, which is adapted to translate an input signal by a translation frequency. The mixer arrangement is operated at a clock rate that equals the translation frequency times an oversampling rate, wherein the oversampling rate is not a multiple of four. The mixer arrangement comprises a sequence generator, at least one pair of mixers, and one or more correction networks. The sequence generator generates an in-phase mixer translation sequence and a quadrature-phase mixer translation sequence based on the oversampling rate. The in-phase mixer translation sequence is a time-discrete representation of a translation frequency sinusoidal function sampled at the clock rate, and the quadrature-phase mixer translation sequence is a time-discrete representation of the translation frequency sinusoidal function phase-shifted by π/2 plus a phase deviation and sampled at the clock rate, wherein the phase deviation is a function of the oversampling rate. Each pair of mixers comprises an in-phase mixer and a quadrature-phase mixer, each adapted to translate a respective input signal based on the respective translation frequency. The one or more correction networks are adapted to, based on the oversampling rate and the phase deviation, compensate for the phase deviation by adjusting at least one of the in-phase mixer input signal, the quadrature-phase mixer input signal, the in-phase mixer output signal, and the quadrature-phase mixer output signal. ## Claims ### Claim 1 A quadrature mixer arrangement adapted to frequency translate a mixer arrangement input signal by a translation frequency to produce a mixer arrangement output signal, wherein the quadrature mixer arrangement is adapted to be operated at a mixer arrangement clock rate that equals the translation frequency times an oversampling rate, wherein the oversampling rate plus an integer number of one, two or three is a multiple of four, the quadrature mixer arrangement comprising: a sequence generator adapted to generate, based on the oversampling rate, an in-phase mixer translation sequence and a quadrature-phase mixer translation sequence, wherein the in-phase mixer translation sequence is a time-discrete representation of a translation frequency sinusoidal function sampled at the mixer arrangement clock rate, and the quadrature-phase mixer translation sequence is a time-discrete representation of the translation frequency sinusoidal function phase-shifted by 90 degrees plus a phase deviation and sampled at the mixer arrangement clock rate, the phase deviation being a function of the oversampling rate; at least one pair of mixers, each pair comprising an in-phase mixer and a quadrature-phase mixer, wherein the in-phase mixer is adapted to, based on the in-phase mixer translation sequence, translate an in-phase mixer input signal to produce an in-phase mixer output signal, the quadrature-phase mixer is adapted to, based on the quadrature-phase mixer translation sequence, translate a quadrature-phase mixer input signal to produce a quadrature-phase mixer output signal, and the in-phase mixer input signal and the quadrature-phase mixer input signal are associated with the mixer arrangement input signal, and the in-phase mixer output signal and the quadrature-phase mixer output signal are associated with the mixer arrangement output signal; and one or more correction networks adapted to, based on the oversampling rate and the phase deviation, compensate for the phase deviation by adjusting at least one of the in-phase mixer input signal, the quadrature-phase mixer input signal, the in-phase mixer output signal, and the quadrature-phase mixer output signal. ### Claim 2 (depends on 1) The mixer arrangement of claim 1 wherein the sequence generator comprises a shifter adapted to generate the quadrature-phase mixer translation sequence as the in-phase mixer translation sequence shifted a number of positions or to generate the in-phase mixer translation sequence as the quadrature-phase mixer translation sequence shifted a number of positions. ### Claim 3 (depends on 1) The mixer arrangement of claim 1 wherein the sequence generator is adapted to generate each of the quadrature-phase mixer translation sequence and the in-phase mixer translation sequence to optimize harmonic rejection properties of the mixer arrangement. ### Claim 4 (depends on 1) The mixer arrangement of claim 1, wherein the phase deviation is less than or equal to an equivalent phase of an inverse of the mixer arrangement clock rate divided by 2. ### Claim 5 (depends on 1) The mixer arrangement of claim 1, wherein the in-phase mixer is adapted to multiply the in-phase mixer input signal with the in-phase mixer translation sequence to produce the in-phase mixer output signal, and wherein the quadrature-phase mixer is adapted to multiply the quadrature-phase mixer input signal with the quadrature-phase mixer translation sequence to produce the quadrature-phase mixer output signal. ### Claim 6 (depends on 1) The mixer arrangement of claim 1, wherein the sequence generator is adapted to generate at least one of the in-phase and quadrature-phase mixer translation sequences by addressing a memory based on the oversampling rate. ### Claim 7 (depends on 1) The mixer arrangement of claim 1 wherein the in-phase and quadrature-phase mixers are implemented by respective variable conductance circuits, each having the respective mixer translation sequences as a control input signal. ### Claim 8 (depends on 1) The arrangement of claim 1, wherein the one or more correction networks are adapted to perform the adjustment by scaling operations and adding operations, wherein the scaling operations are based on the phase deviation. ### Claim 9 (depends on 8) The arrangement of claim 8, wherein the one or more correction networks are further adapted to compensate for an amplitude deviation by adjusting at least one of the in-phase mixer input signal, the quadrature-phase mixer input signal, the in-phase mixer output signal, and the quadrature-phase mixer output signal, and wherein the scaling operations are further based on the amplitude deviation. ### Claim 10 (depends on 1) The mixer arrangement of claim 1, wherein the one or more correction networks are further adapted to compensate for an amplitude deviation by adjusting at least one of the in-phase mixer input signal, the quadrature-phase mixer input signal, the in-phase mixer output signal, and the quadrature-phase mixer output signal. ### Claim 11 (depends on 1) The mixer arrangement of claim 1, wherein: the mixer arrangement is adapted to down-convert the mixer arrangement input signal to produce the mixer arrangement output signal, the mixer arrangement output signal having an in-phase component and a quadrature-phase component, the mixer arrangement input signal is used as the in-phase mixer input signal and as the quadrature-phase mixer input signal, and the one or more correction networks is adapted to adjust at least one of the in-phase mixer output signal and the quadrature-phase mixer output signal and output the in-phase component and the quadrature-phase component of the mixer arrangement output signal. ### Claim 12 (depends on 1) The mixer arrangement of claim 1, wherein: the mixer arrangement input signal has an in-phase component and a quadrature-phase component and comprises two carrier aggregation components, the mixer arrangement is adapted to down-convert the mixer arrangement input signal to produce the mixer arrangement output signal, the mixer arrangement output signal having an in-phase component and a quadrature-phase component for each of the carrier aggregation components, the at least one mixer pairs comprise a first mixer pair using the in-phase component of the mixer arrangement input signal as the in-phase mixer input signal and as the quadrature-phase mixer input signal, and a second mixer pair using the quadrature-phase component of the mixer arrangement input signal as the in-phase mixer input signal and as the quadrature-phase mixer input signal, the one or more correction networks are adapted to, for each of the mixer pairs, adjust at least one of the in-phase mixer output signal and the quadrature-phase mixer output signal and output respective in-phase and quadrature-phase correction network output signals, the mixer arrangement further comprising a carrier aggregation separation network adapted to produce the mixer arrangement output signal based on the in-phase and quadrature-phase correction network output signals of the first and second mixer pairs. ### Claim 13 (depends on 1) The mixer arrangement of claim 1, wherein: the mixer arrangement input signal has an in-phase component and a quadrature-phase component and comprises two carrier aggregation components, the mixer arrangement is adapted to down-convert the mixer arrangement input signal to produce the mixer arrangement output signal, the mixer arrangement output signal having an in-phase component and a quadrature-phase component for each of the carrier aggregation components, the at least one mixer pairs comprise a first mixer pair using the in-phase component of the mixer arrangement input signal as the in-phase mixer input signal and as the quadrature-phase mixer input signal, and a second mixer pair using the quadrature-phase component of the mixer arrangement input signal as the in-phase mixer input signal and as the quadrature-phase mixer input signal, the one or more correction networks is adapted to produce the mixer arrangement output signal based on the in-phase and quadrature-phase mixer output signals of the first and second mixer pairs, wherein producing the mixer arrangement output signal comprises compensating for the phase deviation, compensating for an in-phase/quadrature-phase imbalance present in the mixer arrangement input signal, and providing carrier aggregation separation. ### Claim 14 (depends on 1) The mixer arrangement of claim 1, wherein: the mixer arrangement is adapted to up-convert the mixer arrangement input signal to produce the mixer arrangement output signal, the mixer arrangement input signal having an in-phase component and a quadrature-phase component, the one or more correction networks is adapted to adjust at least one of the in-phase component and the quadrature-phase component of the mixer arrangement input signal, and output the in-phase mixer input signal and the quadrature-phase mixer input signal, and the mixer arrangement output signal comprises the in-phase mixer output signal and the quadrature-phase mixer output signal. ### Claim 15 (depends on 1) A wireless communication receiver comprising the mixer arrangement of claim 1. ### Claim 16 (depends on 1) A wireless communication transmitter comprising the mixer arrangement of claim 1. ### Claim 17 (depends on 1) A wireless communication modem comprising the mixer arrangement of claim 1. ### Claim 18 (depends on 1) A wireless communication device comprising the mixer arrangement of claim 1.