Patent ID: 6307894
Filing Date: 2001-10-23
Classification: H03C,H03D,H03F,H04L

Abstract:
A power amplifier comprising:(a) an oscillator circuit configured to generate reference signals that are 90.degree. out of phase with respect to each other; and(b) a quadrature mixer having:(1) a plurality of mixer elements forming a final gain stage of the power amplifier, each connected by predetermined low impedance inputs with the oscillator circuit to receive one of the reference signals at an RF frequency, and each configured to:(A) receive a signal at a baseband centered frequency through relatively high impedance inputs, the signal containing either an in-phase (I) component or a quadrature (Q) component of a baseband signal to be transmitted; and(B) use one of the reference signals to simultaneously upconvert and amplify the in-phase or the quadrature component of the baseband signal; and(2) combining circuitry configured to combine the upconverted and amplified I and Q components received from the mixer elements to form an output signal.