Tektronix, Inc.

Bruce E Miller

Stewart S Taylor

Thomas P Dagostino

Luis J Navarro

A limiter circuit comprises a first and second differential transistor amplifiers, with the collectors of the transistors of the second amplifier receiving the outputs of the first amplifier. A high gain amplifier has its inverting and non-inverting inputs connected to the output of the first differential amplifier, and has its output connected to the base of one of the transistors of the second amplifier through a feedback network. The differential amplifiers have respective current sources, the current sources of the second amplifier providing a larger current than that of the first amplifier.

Limiting circuit

A time-multiplexed CCD transversal filter includes N filter sections each comprising N substantially identical CCD's connected in parallel. An N-phase clock is connected to each filter section to provide a sampling frequency f.sub.s which is N times the clock frequency f.sub.c. The output taps of all the devices in a filter section are weighted in a predetermined manner and summed, and the outputs of all the filter sections are multiplexed to provide a continuously valid output.

Time-multiplexed CCD transversal filter

A display system for a digital oscilloscope includes an interpolator for interpolating between stored waveform samples and providing additional samples at the interpolated values to thereby increase dot density of the resulting display.

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Portland, OR, United States of America

Bruce E Miller