Method to synchronize two different pulse generators
First Claim
1. A pulse generating apparatus comprised of:
- a first pulse generator wherein spark discharges conduct current to its output;
a second pulse generator having an input and output, operable to produce output pulses that begin at an approximately fixed time period after input signals, wherein semiconductor devices conduct current its output;
a pulse splitter having one input and first and second outputs operable to divide a pulse delivered to its input into two synchronized pulses at its outputs wherein each output pulse is an approximate replica of the input pulse reduced in amplitude by approximately constant factors, and having its input connected directly or through an electrical signal path to the output of said first pulse generator;
a signal cable connecting the first output of said pulse splitter to the input of said second pulse generator; and
a delay cable with input connected to the second output of said power splitter and an output.
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Abstract
This invention generates two pulses for semiconductor testing that have leading edges coordinated in time by synchronizing the pulses from two different styles of pulse generators (pulsers). One pulser uses spark discharge pulse generation and the other pulser is a typical solid state pulser. The spark discharge pulser has high power pulse generation but its pulse timing can not be tightly controlled. The output pulse of the spark discharge pulser is split unequally, with a small amount used to trigger the solid state pulser, and the large pulse energy delayed by a cable of length for a signal propagation delay equal or greater than the trigger-input-to-pulse-output delay of the solid state pulser. Variable attenuators control the trigger signal amplitude and a level shifting circuit makes the trigger signal compatible with standard logic signal levels. The two pulses can be applied to semiconductors with their leading edges adjustable relative to each other to measure the semiconductors operation.
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Citations
17 Claims
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1. A pulse generating apparatus comprised of:
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a first pulse generator wherein spark discharges conduct current to its output; a second pulse generator having an input and output, operable to produce output pulses that begin at an approximately fixed time period after input signals, wherein semiconductor devices conduct current its output; a pulse splitter having one input and first and second outputs operable to divide a pulse delivered to its input into two synchronized pulses at its outputs wherein each output pulse is an approximate replica of the input pulse reduced in amplitude by approximately constant factors, and having its input connected directly or through an electrical signal path to the output of said first pulse generator; a signal cable connecting the first output of said pulse splitter to the input of said second pulse generator; and a delay cable with input connected to the second output of said power splitter and an output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification