Circuit for Use with a Loudspeaker for Portable Equipments

摘要

The invention relates to a circuit (100) for use with a loudspeaker (104) having a first differential input terminal (t1) and a second differential input terminal (t2), the circuit (100) comprising: a differential power amplifier (103) having a first differential output terminal (t3) operatively connected to the first differential input terminal (t1) of the loudspeaker (104) and a second differential output terminal (t4) operatively connected to the second differential input terminal (t2) of the loudspeaker (104);—a first resistor (RS1) disposed between the first differential output terminal (t3) of the differential power amplifier (103) and the first differential input terminal (t1) of the loudspeaker (104); a second resistor (RS2) disposed between the second differential output terminal (t4) of the differential power amplifier (103) and the second differential input terminal (t2) of the loudspeaker (104). The circuit (100) further comprises: a first resistive module (RR1, RR2) arranged to generate on a respective output terminal (t5) a first control voltage (VIN), the first resistive module (RR1, RR2) having a first input terminal (t6) connected to the first differential output terminal (t3) of the power amplifier (103) and a second input terminal (t7) connected to the second differential input terminal (t2) of the loudspeaker (104), a second resistive module (RR3, RR4) arranged to generate on a respective output terminal (t8) a second control voltage (VIP), the second resistive module (RR3, RR4) having a first input terminal (t9) connected to the second differential output terminal (t4) of the power amplifier (103) and a second input terminal (t10) connected to the first differential input terminal (t1) of the loudspeaker (104). The loudspeaker circuit (100) being arranged to control the differential power amplifier (103) on the basis of the first control voltage (VIN) and the second control voltage (VIP).

主权项

1. A circuit for use with a loudspeaker having a first differential input terminal and a second differential input terminal, the circuit comprising:
a differential power amplifier having a first differential output terminal operatively connected to the first differential input terminal of the loudspeaker and a second differential output terminal operatively connected to the second differential input terminal of the loudspeaker; a first resistor disposed between the first differential output terminal of the differential power amplifier and the first differential input terminal of the loudspeaker; a second resistor disposed between the second differential output terminal of the differential power amplifier and the second differential input terminal of the loudspeaker, the circuit wherein it further comprises: a first resistive module arranged to generate on a respective output terminal a first control voltage, the first resistive module having a first input terminal connected to the first differential output terminal of the power amplifier and a second input terminal connected to the second differential input terminal of the loudspeaker, a second resistive module arranged to generate on a respective output terminal a second control voltage, the second resistive module having a first input terminal connected to the second differential output terminal of the power amplifier and a second input terminal connected to the first differential input terminal of the loudspeaker, the circuit being arranged to control the differential power amplifier on the basis of the first control voltage and the second control voltage.