Micropower amplifier/transducer driver with signal expansion

H - Electricity – 03 – F

Patent

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Details

H03F 3/04 (2006.01) H03F 1/02 (2006.01) H03F 1/32 (2006.01) H03F 3/30 (2006.01) H04M 1/60 (2006.01) H04R 25/00 (2006.01)

Patent

CA 2093060

An amplifier which combines the low quiescent current requirements of a Class B transistor amplifier with the minimal distortion qualities of a Class AB amplifier. In one disclosed embodiment the amplifier is utilized as a receiver amplifier and as a transmitter in a modular telephone adapter for coupling a telephone headset to a conventional modular telephone comprising a handset and a base unit. Signal expansion circuitry takes advantage of the dynamic emitter resistance of transistors in the amplifier's output stage through modulation of collector current in the output transistors and inverted phase summation of the resulting error signal with the input signal. DC bias circuitry supplies a current supply which is relatively insensitive to changes in power supply or device parameters. In one disclosed embodiment of the invention, two such amplifiers are utilized in a modular telephone headset adapter which allows a telephone headset and a telephone handset to be switchably connected to a telephone base unit.

L'invention est un amplificateur qui combine les avantages du faible courant de repos des amplificateurs à transistors de classe B avec la distorsion minimale des amplificateurs de classe AB. Dans l'une des concrétisations divulguées de l'invention, l'amplificateur est utilisé comme amplificateur de réception et comme émetteur dans un adaptateur téléphonique modulaire pour coupler un casque téléphonique à un téléphone modulaire ordinaire comportant un combiné et un socle. Un circuit d'expansion de signaux tire profit de la résistance dynamique de l'émetteur des transistors de l'étage de sortie de l'amplificateur en modulant le courant de collecteur des transistors de sortie et en sommant la phase inversée du signal d'erreur résultant avec celle du signal d'entrée. Un circuit de polarisation directe fournit un courant relativement insensible aux variations des paramètres de l'alimentation ou du dispositif. Dans l'une des concrétisations divulguées de l'invention, deux amplificateurs de ce type sont utilisés dans un adaptateur de casque téléphonique modulaire qui permet de connecter de façon commutable à un socle de téléphone un casque téléphonique et un combiné téléphonique.

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