| 摘要 |
PURPOSE:To improve the responsiveness, to apply the titled amplifier to a continuous signal transmission except a burst signal transmission, and to easily realize an LSI by executing an automatic gain control and a compensation of an offset voltage by a gain control signal and an offset control signal, which have been generated, based on a pair of positive and negative peak value level detecting signals. CONSTITUTION:In case an input signal Si to be amplified is a bipolar signal, a peak value level of a +1 signal being a positive peak value and a peak value level of a -1 signal being a negative peak value are detected continuously as a time series, the peak value level of the +1 signal and the peak value level of the -1 signal are regarded as a pair of detecting signals, and if the peak value levels of the +1 signal and the -1 signal are both larger than a reference value, a control is executed so as to lower the gain of an amplifier 4, and if both are smaller, a control is executed so as to raise the gain of the amplifier 4. Also, in case the peak value level of the +1 signal is larger than the reference value, and the peak value level of the -1 signal is smaller than the reference, the gain remains as it is and an offset compensating signal S1 is controlled so that an offset voltage becomes small by applying a DC voltage DELTAV whose polarity is the same as the polarity of the -1 signal, to the peak value detecting point.
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