Patent ID: 8089309

Claim:
A device for mixing signals, comprising: a Gilbert mixer stage having a cascode connected switching quad; and a differential transimpedance amplifier input stage operatively coupled to the Gilbert mixer stage, and for generating a current signal that is applied to the cascode connected switching quad of the Gilbert mixer stage, the differential transimpedance amplifier configured with a pair of input transistors for receiving an input signal and a pair of output transistors for outputting the current signal, wherein the output transistors are directly coupled to each other by a first impedance so as to allow signal coupling between a first node associated with one of the output transistors and a second node associated with the other output transistor, wherein each of the first and second nodes are further operatively coupled to a power supply node by circuitry comprising at least second and third impedances, respectively, and wherein the first impedance in combination with at least the second and third impedances shape frequency response and gain of the device.