| 摘要 |
PROBLEM TO BE SOLVED: To provide a load resistance value detection circuit that detects a resistance value without causing pop noise and in real time.SOLUTION: A transistor circuit of a replica circuit 2 has transistors 15 and 16 which are 1/x the size of a P type transistor 11 and an N type transistor 12 of an output stage circuit 10 and are supplied with the same input signals as the P type transistor 11 and the N type transistor 12 of the output stage circuit 10. A resistance circuit 17 comprising resistances 19, 20, 21, and 22 whose modes of connection can be changed by switches 23, 24, and 25 is connected to an output terminal of the replica circuit 2. An output signal OUT of the output stage circuit 10 and an output signal DOUT of the replica circuit 2 are compared in magnitude while the switches 23, 24, and 25 are changed over, thereby determining a resistance value of a load connected to an output terminal 13 of the output stage circuit. |
