| 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:A peak of a pulse is detected by a peak value detection circuit 2 and an output voltage being the result of detection is amplified up to a proper level by a DC amplifier circuit 3 to obtain a compensation voltage. The compensation voltage is added to a main signal, i.e., an input pulse train inputted to a common source amplifier 5 via an input terminal 1 and a capacitor C1 and a bias application resistor R1 to apply DC compensation to the input pulse train being the master signal. Thus, a DC level fluctuation of an NRZ input pulse train whose DC component is interrupted is eliminated and an ideal DC compensation characteristic is easily obtained from an ultrahigh speed pulse signal. |
