| 摘要 |
PURPOSE:To observe waveforms with high accuracy without transient phenomena by applying negative feedback and input switching to a signal amplification system. CONSTITUTION:The output of a differential amplifier 3 is negatively fed back from the output point (g) thereof to the inversion input (b) of the amplifier 3 via an amplifier 9 and an LPF 10. The output of the point (g) is applied from the point (h) of the LPF 101 to the amplifier 92, the output thereof is applied to the non-inversion input (a) of the amplifier 3. When a signal to be observed is inputted at a constant period (T2+T1) to an SW 11 at the time (x), the SWs 11, 13 go on with DELTAt delay from the time (x), and an SW 12 goes off, then the signal to be observed is applied via a capacitor 15 and the amplifier 3 to a CRT 4. In the time zone T1+DELTAt, the SWs 11 and 13 go off and the SW 12 goes on. As a result, the output of the amplifier 3 attains an equil. state after a short time, and part of the intended signal waveform is observed under magnification. |
