Circuit and method for i/q modulation with independent, high...

Details Circuit and method for i/q modulation with independent, high... Circuit and method for i/q modulation with independent, high...

H - Electricity

03

C

H03C 5/00 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2351685

An RF amplifier includes a phase modulator developing a phase modulated RF input signal to be transmitted. A power amplifier receives the RF input signal and amplifies the RF input signal to develop an RF output signal. An amplifier control is operatively associated with the phase modulator and the power amplifier. The amplifier control includes a memory for storing correction information correlating desired amplitude of the RF output signal relative to actual amplifier amplitude, and a control varies power amplifier supply voltage responsive to the correction information to linearize amplitude modulation in the power amplifier.

Cette invention se rapporte à un amplificateur RF, qui comprend un modulateur de phase développant un signal d'entrée RF modulé en phase, devant être transmis. A cet effet, un amplificateur de puissance reçoit le signal d'entrée RF et l'amplifie, afin de développer un signal de sortie RF. Une commande d'amplificateur est associée fonctionnellement au modulateur de phase et à l'amplificateur de puissance. Cette commande d'amplificateur comprend une mémoire servant à stocker des informations de correction mettant en corrélation l'amplitude souhaitée du signal de sortie RF et l'amplitude effective de l'amplificateur, et une commande fait varier la tension d'alimentation de l'amplificateur en réponse aux informations de correction, afin de linéariser la modulation d'amplitude dans l'amplificateur de puissance.

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