Amplifier biasing circuit

H - Electricity – 03 – F

Patent

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Details

H03F 1/00 (2006.01) H03F 3/45 (2006.01) H03G 1/00 (2006.01) H04M 3/22 (2006.01) H04M 19/02 (2006.01)

Patent

CA 2085415

This amplifier biasing circuit is used in a telecommunication ring trip circuit to control the bias of a sense amplifier (SA) having input terminals (I1, I2) coupled to output terminals (A, B) of a Herter bridge (R0/R5) which is also coupled to a telecommunication line (L) and to a rinsing signal source (RC). The bias circuit is a negative feedback loop coupled between terminals I1 and I1, I2 of SA and regulates the voltage at the latter terminals to a reference value when the input voltage on terminal I1 exceeds a predetermined value in one direction, by connecting a variable bias impedance (R6, PNP1, R7, PNP2) between the amplifier input terminals and VBAT.

Circuit de polarisation d'amplificateur, utilisé dans un circuit de sonnerie de télécommunication afin de commander la polarisation d'un amplificateur de détection (SA) ayant deux bornes d'entrée (I1, I2) couplées à des bornes de sortie (A, B) d'un pont Herter (R0/R5), lequel est également couplé à une ligne de télécommunication (L) et à une source de signal de sonnerie (RC). Le circuit de polarisation consiste en une boucle de contre-réaction couplé entre les bornes I1 et I1,I2 du SA et stabilise la tension appliquée à ces dernières selon une valeur de référence lorsque la tension d'entrée à la borne I1 dépasse une valeur prédéterminée dans une direction, en connectant une impédance de polarisation variable (R6, PNP1, R7, PNP2) entre les bornes d'entrée de l'amplificateur et la VBAT.

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