Constant percentage clipping circuit

Details Constant percentage clipping circuit Constant percentage clipping circuit

H - Electricity

03

K

330/103

H03K 5/08 (2006.01) H03G 11/00 (2006.01)

Patent

CA 1069595

ABSTRACT OF THE DISCLOSURE The input waveform is applied via an input resistor to the inverting input of an operational amplifier. The non-invert- ing input is grounded. In the preferred embodiment, two feedback networks, each comprising a diode and resistor network, are con- nected between the output and the inverting input of the amplifi- er. The diodes are oppositely poled. A capacitor is connected to ground at one end and to a charging resistor at the other. The other end of the charging resistor is connected to a junction formed by the resistor and diode in one of the feedback loops. The charging resistor is selected so that the value of the volt- age for the reference which is supplied by the voltage across the capacitor C, called ec, is of the value to obtain the percentage clipping desired. A discharge resistor is selected so that the capacitor and discharge resistor have a long time constant with respect to the input frequency of the waveform. The ratio of the resistor in the resistor diode feedback path which supplies the charging current to capacitor C to the resistance of the input resistor provides the constant percentage ratio of the clipper.

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