| 摘要 |
PURPOSE:To clamp a desired signal by giving an input to be clamped to an output section of each buffer circuit via a resistor, obtaining a clamp output from the output section of the buffer circuit and using a switch circuit to change over each buffer circuit. CONSTITUTION:A switching signal is fed to switches 241, 242 from a switch circuit 26 based on a control signal fed to a control input terminal 28 and when the switch 241 is supposed to be closed, only a buffer circuit 221 is actuated and clamp voltages +VD, -VD are set to input/output points. When input signals V1H1, V1H2 are fed to input terminals 641, 642, then a clamp output V01 is generated at an output terminal 601 of the circuit 221. The operation above is conducted when the switch 242 is closed, a clamp output V02 is generated at an output 602 only in this case, and when both the switches 241, 242 are closed, clamp outputs V01, V02 are generated respectively on the terminals 601, 602. |
