H - Electricity – 03 – G
Patent
H - Electricity
03
G
H03G 3/30 (2006.01) H03G 1/00 (2006.01) H03G 3/00 (2006.01)
Patent
CA 2344141
A control circuit (200) for controlling a level of an audio signal and transmitting the signal to an amplifier (AMP2) is described. The control circuit is based on an R-2R resistor network having a plurality of resistor nodes. A plurality of switches (S1, S2) alternately connects each of the plurality of resistor nodes to one of a plurality of low impedance nodes and a low impedance input node associated with the amplifier. Switch control circuitry (202) selectively controls the plurality of switches to transmit the audio signal to the low impedance input node.
L'invention concerne un circuit de (200) commande permettant de réguler l'intensité d'un signal audio, et de transmettre ledit signal à un amplificateur (AMP2). Le circuit de commande repose sur un réseau de résistances R-2R comportant une pluralité de noeuds de résistance. Une pluralité de commutateurs (S1, S2) relient alternativement chacun des noeuds de résistance à l'un des noeuds de faible impédance et à un noeud d'entrée de faible impédance associé à l'amplificateur. Le circuit (202) de commande des commutateurs commande de façon sélective la pluralité des commutateurs afin de transmettre le signal audio au noeud d'entrée de faible impédance.
Delano Cary L.
Llewellyn William D.
Cassan Maclean
Tripath Technology Inc.
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