Patent ID: 8031019
Filing Date: 2011-10-04
Classification: H03B

Abstract:
1. An apparatus comprising a voltage controlled oscillator (VCO) coupled to a mixer, the VCO comprising: a first transistor configured to be DC biased by a first bias current; a second transistor configured to be DC biased by a second bias current; at least one gate inductance coupling the gate of the first transistor to the gate of the second transistor; a first drain inductance magnetically coupled to the at least one gate inductance, the first drain inductance coupled to the drain of the first transistor; a second drain inductance magnetically coupled to the at least one gate inductance, the second drain inductance coupled to the drain of the second transistor; and at least one variable capacitance coupling the gate of the first transistor to the gate of the second transistor, the mixer comprising first and second input nodes coupled to the first and second drain inductances, respectively, the mixer configured to be biased by the first and second bias currents, the at least one gate inductance being formed by a primary coil, the first and second drain inductances being formed by two secondary coils, and the two secondary coils being laid out inside or stacked underneath the primary coil.