| 摘要 |
PURPOSE: To realize clamping with an excellent temperature characteristic and high accuracy by setting a negative peak level of a triangle wave signal of an output signal of an integration circuit to a setting potential when a transistor (TR) is conductive by a differentiation signal of a differentiation circuit and obtaining a clamped triangle wave signal to the setting potential at an output of a DC block capacitor. CONSTITUTION: An integration circuit 2 and a differentiation circuit 4 generating a triangle wave signal are connected to an output side of a square-wave signal oscillator 1. The differentiation circuit 4 is made up of resistors R3, R4 and a capacitor C4. When a TRQ1 is turned on by a differentiation signal of the differentiation circuit 4, a negative peak of a triangle wave signal of an output signal of the integration circuit 2 is forcibly set to a prescribed potential and a charge equivalent to a difference between the set potential and a voltage being a half of a peak-to-peak voltage Va is charged in a DC blocking capacitor C2. Thus, a triangle wave signal clamped to the setting potential is obtained at the output side of the capacitor C2. When a load impedance of the clamp circuit is light, no buffer amplifier A1 is required. |
