The high-speed absolute value amplifier circuit diagram

Published:2011/6/8 22:01:00 Author:leo | Keyword: The high-speed absolute value amplifier circuit diagram, LM318, HA2525 | From:SeekIC

The picture 1 shows a high-speed absolute value amplifier circuit. The operating amplifier and diode form the ideal diode circuit which is used to detect communication signals. However, in the ideal diode circuit, rectified input voltage gives an effect directly to the frequency of operating amplifier and high frequency is limited. High speed operating amplifier, such as LM318, HA2525, μA715 and so on, can ensure an over 100kZ operating frequency. Operational Amplifier should be selected in the high-speed absolute value amplifier circuit. In this circuit, A1 uses HA2526 operational amplifier and also LM318. But the cut-off distortion of diode affects the high frequency operating, therefore, it takes VT1 and VT2 to form constant current source in this circuit.



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