Temperature compensated variable gain amplifier

H - Electricity – 03 – G

Patent

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H03G 1/00 (2006.01) H03F 1/30 (2006.01) H03G 1/04 (2006.01)

Patent

CA 2164323

An amplifier for a radio transceiver overcomes the problem of gain being dependent on ambient temperature. Transmission power is matched to strength of a received signal by providing matched dual gate FET amplifier stages in both the transmitter and receiver portions of the transceiver. Changes in gain due to temperature are compensated for by detecting changes in the FET drain current by measuring the source voltage of the amplifier. The FET source voltage is compared to a reference voltage, and the output signal resulting from the comparison is provided as a control signal to one of the FET gates.

Amplificateur pour émetteur-récepteur radio, offrant une solution au problème de la dépendance du gain à l'égard de la température ambiante. La puissance de transmission est adaptée à l'intensité du signal reçu, l'émetteur et le récepteur étant tous deux dotés d'étages d'amplification à FET double grille adaptés. Les modifications de gain dues à la température sont compensées par la détection des modifications du courant drain de FET au moyen de mesures de la tension de source de l'amplificateur. La tension source de FET est comparée à une tension de référence, et le signal de sortie résultant de la comparaison est transmis comme signal de commande à une des grilles de FET.

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