Patent ID: 8630603

Claim:
A circuit for image frequency rejection, the circuit comprising: an analog dual-quadrature mixer device having signal inputs for an in-phase signal and a quadrature-phase signal that are connectable to an input circuit in a signal path, the analog dual quadrature mixer device having oscillator inputs for an in-phase oscillator signal and a quadrature-phase oscillator signal that are connectable to a local oscillator device; an analog adder-amplifier device having a plurality of transistor pairs, both transistors of each transistor pair being connectable to the same load resistor for the addition of the in-phase signal and the quadrature-phase signal applied at control inputs of both transistors, the control inputs of both transistors being connectable downstream of the outputs of the analog dual-quadrature mixer device; and a multistage analog polyphase filter having inputs that are connectable to outputs of the adder-amplifier device.