| 摘要 |
PURPOSE:To attain reproduction with large dynamic range without signal distortion by outputting selectively a signal at a connecting point between the 1st current mirror circuit and the 1st resistor and a signal at a connecting point between the 2nd current mirror circuit and the 2nd resistor. CONSTITUTION:When a potential of an output signal F of an amplifier 1 is higher than a voltage Va of a reference voltage source 3, a collector current IC1 of a transistor (TR) 21 is increased and transferred by a current mirror circuit 29 to increase the collector potential of a TR18. On the other hand, a collector current IC2 of a TR23 is decreased, the result appears as a collector current of a TR25 by a current mirror circuit 30 to lower the collector potential of the TR25. On the other hand, when the potential of the signal F is lower than the voltage Va, the collector potential of the TR18 is lowered to rise the potential of the TR25. Then, the collector signal of the TR18 becomes a non-inverting output G, a collector signal of the TR25 becomes an inverting output H and the outputs are outputted selectively in response to the non-inverting or inverting regeneration by a switch circuit 12. |
