Patent ID: 6215356
Filing Date: 2001-04-10
Classification: H03F

Abstract:
Amplifier arrangement (A) including a class-G amplifier (G), said class-G amplifier including a first pair of supply terminals (GV1+,GV1-) adapted to receive a first pair of bias voltages (V1+,V1-), and a second pair of supply terminals (GV2+,GV2-) adapted to receive a second pair of bias voltages (V2+,V2-), the range of voltages between said second pair of bias voltages (V2+, V2-) entirely covering and being larger than the range of voltages between said first pair of bias voltages (V1+, V1-), said amplifier arrangement (A) including an input terminal (IN) coupled to an input terminal of a drive control circuit (DCD), said drive control circuit (DCD) includes at least two output terminals (DCDOUT1,DCDOUT2, DCDOUT3, DCDOUT4) coupled to at least two input terminals (ING1,ING2,ING3,ING4) of said class-G amplifier, said amplifier arrangement including an output terminal (OUT) coupled to an output terminal (OUTG) of said class-G amplifiercharacterized in thatsaid amplifier arrangement (A) further includes a second amplifier (C), an output terminal (OUTC) of which is coupled to said output terminal (OUT), said second amplifier (C) including an additional pair of supply terminals (CV2+,CV2-), adapted to receive said second pair of bias voltages (V2+,V2-),said drive control circuit (DCD) further includes at least one additional output terminal (DCDOUT5,DCDOUT6) coupled to at least one input terminal (INC1,INC2) of said second amplifier (C),said drive control circuit (DCD) thereby being adapted to turn on said second amplifier (C) at a higher or equal input signal amplitude than the input signal amplitude at which the current in said class-G amplifier is internally switched over from said first pair of supply terminals to said second pair of supply terminals.