| 摘要 |
A circuit for peaking video signals is disclosed. The circuit includes a differential amplifier which produces a peaking component at an output, and a signal delay line for determining the frequency at which maximum peaking occurs. The delay line input is coupled to a source of video signals to be peaked and to one input of the differential amplifier, and the delay line output is coupled to another input of the differential amplifier and to a signal combining point. A peaked video signal is produced by combining the peaking component from the differential amplifier with the delayed signal from the delay line. The operating parameters of the peaking circuit are established with respect to a normally expected range of video signal amplitude transitions so that the differential amplifier exhibits a linear response for transient or aperiodic transitions throughout the amplitude transition range. However, the differential amplifier exhibits a non-linear response for periodic transitions recurring at the maximum peaking frequency, and having a magnitude greater than half the maximum transition magnitude of the range.
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