Patent ID: 7388433

Claim:
A quadrature radio frequency (RF) amplifier circuit comprising: an in-phase driver circuit and an in-phase final stage providing an in-phase amplifier circuit having a first nominal gain and a first operating gain; and a quadrature-phase driver circuit and a quadrature-phase final stage providing a quadrature-phase amplifier circuit having a second nominal gain and a second operating gain, wherein corresponding terminals of the in-phase amplifier circuit and the quadrature-phase amplifier circuit are coupled to a common ground lead, which is inductively coupled to ground, the first nominal gain is substantially unequal to the second nominal gain if a common signal is provided to the in-phase amplifier circuit and the quadrature-phase amplifier circuit, and the first operating gain is substantially equal to the second operating gain when an in-phase input signal is provided to the in-phase amplifier circuit and a quadrature-phase input signal, which is phase shifted approximately 90 degrees from the in-phase input signal, is provided to the quadrature-phase amplifier circuit.