Patent ID: 7027792

Claim:
A mixer circuit for generating an IF output responsive to an RF input and a LO drive source, comprising: a mixer core having a doubly balanced mixer including a first differentially coupled transistor pair and a second differentially coupled transistor pair; an RF input circuit coupled to the mixer core, the RF input circuit comprising: a first inductor having a first terminal coupled to receive an RF input signal and a second terminal; a biasing resistor having a first terminal coupled to the second terminal of the first inductor and a second terminal coupled to a first bias voltage; a first input transistor having a first terminal coupled to the second terminal of the first inductor, a second terminal, and a third terminal; a second inductor having a first terminal coupled to the second terminal of the first input transistor and to the first differentially coupled transistor pair, the second inductor also having a second terminal coupled to a ground potential; a supply resistor having a first terminal coupled to the third terminal of the first input transistor and a second terminal coupled to a supply potential; a first capacitor having a first terminal also coupled to the third terminal of the first input transistor and a second terminal coupled to the second differentially coupled transistor pair; and a third inductor having a first terminal coupled to the second terminal of the first capacitor and a second terminal coupled to the ground potential.