Down-conversion frequency mixer circuit

A frequency mixer circuit comprising:

• a gain stage including:
• first and second inductors each having a first terminal and a second terminal, said second terminals of said first and second inductors being disposed to receive a differential input voltage signal;
• first and second transistors each having a first terminal, a second terminal and a control terminal, said first terminals of said first and second transistors outputting a differential current signal with an input frequency, said second terminals of said first and second transistors being coupled respectively to said first terminals of said first and second inductors;
• a first capacitor-inductor pair that includes a capacitor and an inductor coupled in series and that is coupled between said control terminal of said first transistor and said second terminal of said first inductor;
• and
• a second capacitor-inductor pair that includes a capacitor and an inductor coupled in series and that is coupled between said control terminal of said second transistor and said second terminal of said second inductor;
• and
• a mixer disposed to receive a differential local oscillator (LO) voltage signal with a LO frequency, coupled to said first terminals of said first and second transistors of said gain stage for receiving the differential current signal therefrom, and configured to output a differential output voltage signal having a mixed frequency associated with the input frequency and the LO frequency.