A double balanced image reject mixer comprising: a radio frequency common port; four mixer devices (121, 122, 123, 124), each of the four mixer devices comprising an intermediate frequency port, an RF port and a local oscillator port; a four-way splitter/combiner, wherein the four-way splitter/combiner is connected between the RF common port and the RF ports of the four mixer devices; a digital four phase LO quadrature generator connected between an LO common port and the LO ports of the four mixer devices, the digital four phase LO quadrature generator comprising digital circuitry configured to generate a respective LO signal for each of the four mixer devices based on a common LO signal at the LO common port, and to provide each respective LO signal to the respective LO port of the respective mixer device of the four mixer devices; and a four phase IF quadrature generator connected between an IF common port and the IF ports of the four mixer devices, wherein the four phase IF quadrature generator is configured to convert between a common IF signal at the IF common port and a respective IF signal at each IF port of the four mixer devices, wherein each respective LO signal is 90° out of phase with another of the respective LO signals, characterized in that the four phase IF quadrature generator comprises an IF balun and a first and second IF quadrature (160A, 160B), wherein the IF balun is configured to convert between the common IF signal and first and second balun signals that are 180° out of phase from each other, wherein the first IF quadrature is configured to convert between the first balun signal and first and second of the IF signals that are orthogonal from each other, and wherein the second IF quadrature is configured to convert between the second balun signal and third and fourth of the IF signals that are orthogonal from each other. a radio frequency common port; four mixer devices (121, 122, 123, 124), each of the four mixer devices comprising an intermediate frequency port, an RF port and a local oscillator port; a four-way splitter/combiner, wherein the four-way splitter/combiner is connected between the RF common port and the RF ports of the four mixer devices; a digital four phase LO quadrature generator connected between an LO common port and the LO ports of the four mixer devices, the digital four phase LO quadrature generator comprising digital circuitry configured to generate a respective LO signal for each of the four mixer devices based on a common LO signal at the LO common port, and to provide each respective LO signal to the respective LO port of the respective mixer device of the four mixer devices; and a four phase IF quadrature generator connected between an IF common port and the IF ports of the four mixer devices, wherein the four phase IF quadrature generator is configured to convert between a common IF signal at the IF common port and a respective IF signal at each IF port of the four mixer devices, wherein each respective LO signal is 90° out of phase with another of the respective LO signals, characterized in that the four phase IF quadrature generator comprises an IF balun and a first and second IF quadrature (160A, 160B), wherein the IF balun is configured to convert between the common IF signal and first and second balun signals that are 180° out of phase from each other, wherein the first IF quadrature is configured to convert between the first balun signal and first and second of the IF signals that are orthogonal from each other, and wherein the second IF quadrature is configured to convert between the second balun signal and third and fourth of the IF signals that are orthogonal from each other.