| 摘要 |
PURPOSE:To avoid occurrence of the distortion caused by the nonlinear element, to prevent the noise piling on the output signal and to eliminate occurrence of the crosstalk by means of the amplifier with which the output signal is obtained via the signals of two systems of the voltage and the current. CONSTITUTION:Input terminal 1a is connected to coninversion input terminal 2a of operational amplifier 2, and terminal 1b is connected to reference voltage line 5 connected to the middle point between positive and negative power sources 3 and 4 respectively. Transistor Q1 and Q2 form voltage floor 6 along with amplifier 2 and then connected in series between constant power source 11 and 12, and the connection point is connected to 1st output terminal 13a to which load resistance 15 is connected. At the same time, transistor Q4 and Q5 are connected in series between source 11 and 12 and in parallel to Q1 and Q2 respectively, and the middle connection point is connected to 2nd output terminal 13b to which load resistance 16 is connected. In such constitution of the circuit, voltage Vi is applied between terminal 1a and 1b, and thus both the voltage output and the current output proportional to Vi are obtained between terminal 13a and line 5 as well as between terminal 13b and line 5 each. And the current between connection point 47 and line 5 becomes zero. |
