Patent ID: 8340606
Filing Date: 2012-12-25
Classification: H03F,H04B

Abstract:
1. A signal amplifier comprising: a digital-to-analog converter which converts a digital signal into an analog signal; a local oscillator signal generator which generates in-phase and quadrature-phase local oscillator signals; a first mixer which mixes the analog signal with the in-phase local oscillator signal and generates an in-phase high frequency signal; a second mixer which mixes the analog signal with the quadrature-phase local oscillator signal and generates a quadrature-phase high frequency signal; a main amplifier which amplifies only the in-phase high frequency signal outputted by the first mixer; and an auxiliary amplifier which amplifies only the quadrature-phase high frequency signal outputted by the second mixer, wherein the analog signal having a same phase is split and mixed with the in-phase local oscillator signal in the first mixer and with the quadrature-phase local oscillator signal in the second mixer.