| 摘要 |
PURPOSE:To attain accurate DC compensation even to an ultrahigh speed signal by detecting a pulse peak and adding a DC voltage in response to the peak value to the input pulse train. CONSTITUTION:The circuit consists of a peak value detection circuit 2 detecting a peak value of a binary input signal whose DC component is cut off, a DC amplifier 3 amplifying an output signal of the peak value detection circuit 2 and a broad band negative feedback amplifier 5 adding an output voltage of the DC amplifier 3 to the input signal and amplifying the result. The broad band negative feedback amplifier 5 takes a form connecting drains of two field effect transistors FET1, FET2 each source connects to ground, an output signal is extracted from drain ends of the two field effect transistors and a negative feedback signal is inputted to a gate of the TR via the feedback circuit 13. Thus, an ideal DC compensation characteristic is easily obtained from an ultrahigh speed pulse signal. |
