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US 4,718,036 AGranted
Comparator-integrator loop for digitizing a waveform
AssigneeBurr-Brown Corporation
InventorsJoel M. Halbert, Myron J. Koen
Life of this patent
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Abstract
A latching comparator has a signal input connected to the output of a device under test. A strobe input of the comparator has a strobe signal applied thereto, whereby the output of the device under test is repeatedly sampled. The output of the comparator drives an integrator, preferably through a filter. The output of the integrator drives a reference input of the comparator and a computer. The computer is driven via an A/D converter, whereby a digitized representation of the output of the device under test is provided to the computer.
Claims9
A comparator-integrator loop comprising:
- a latching comparator with a signal input adapted for connection to the output of a device under test;
- an operational amplifier with its output coupled to a reference input of said comparator;
- an integrating capacitor that couples said amplifier output to the inverting input of said amplifier, whereby said amplifier and capacitor form an integrator;
- filter means disposed between an output of said comparator to the inverting input of said amplifier for rounding off signal spikes;
- means for clocking a latch enable input of said comparator until the output of said amplifier is in an equilibrium state;
- and
- means for establishing a current that flows into the input of said integrator.
4 more elements
Dependencies are inferred from the claim text.