Power amplifier bias control circuit and method

Details Power amplifier bias control circuit and method Power amplifier bias control circuit and method

H - Electricity

03

F

H03F 3/20 (2006.01) H03F 1/02 (2006.01) H03F 1/30 (2006.01)

Patent

CA 2136749

A control circuit for a multi-stage power amplifier (such as in a portable radio transmitter) compensates for fluctuations in ambient temperature, load, signal level and power supply voltage. The control voltage is set by comparing a biasing level which is related to the amplifier input signal level to a voltage proportional to the power supply current of the last stage of the amplifier. The control voltage resulting from the comparison establishes the operating point of the last stage of the power amplifier.

Un circuit de commande pour un amplificateur de puissance à étages multiples (comme dans un émetteur radio portable) compense les fluctuations de température ambiante, de charge, de niveau de signal et de tension d'alimentation. La tension de commande est réglée en comparant un niveau de polarisation relié au niveau de signal d'entrée de l'amplificateur avec une tension proportionnelle au courant d'alimentation du dernier étage de l'amplificateur. La tension de commande résultant de la comparaison établit le point de fonctionnement du dernier étage de l'amplificateur.

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