Patent ID: 7058139
Filing Date: 2006-06-06
Classification: H03C,H04B

Abstract:
1. A transmitter comprising: a quadrature modulator adapted to provide a quadrature modulated signal from a pair of quadrature base band signals; a variable gain amplifier adapted to provide an amplified quadrature modulated signal; an up-converter adapted to up-convert said amplified quadrature modulated signal to a higher frequency signal; a variable gain power amplifier adapted to provide an amplified higher frequency signal from said higher frequency signal, said amplified higher frequency signal comprising amplitude and phase information; and phase adjusting means for adjusting an overall phase of a transmitter chain including said quadrature modulator, said variable gain amplifier, said up-converter, and said variable gain power amplifier, said overall phase being adjusted on the basis of pre-stored phase information reflecting phase changes due to simultaneous gain changes of gains of at least said variable gain amplifier and said variable gain power amplifier, wherein said phase changes will not exceed a predetermined value, said phase adjusting means being configured to keep said phase changes below said predetermined value.