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High speed transient sampler
| Details |
Inventors: McEwan, Thomas E.;
Assignee: The Regents of the University of California (Oakland, CA)
Primary Examiner: Dolinar; Andrew M.
Assistant Examiner:
Attorney, Agent or Firm: Sartorio; Henry P.
A high speed sampler comprises a meandered sample transmission line for transmitting an input signal, a straight strobe transmission line for transmitting a strobe signal, and a plurality of sampling gates along the transmission lines. The sampling gates comprise a four terminal diode bridge having a first strobe resistor connected from a first terminal of the bridge to the positive strobe line, a second strobe resistor coupled from the third terminal of the bridge to the negative strobe line, a tap connected to the second terminal of the bridge and to the sample transmission line, and a sample holding capacitor connected to the fourth terminal of the bridge. The resistance of the first and second strobe resistors is much higher than the signal transmission line impedance in the preferred system. This results in a sampling gate which applies a very small load on the sample transmission line and on the strobe generator. The sample holding capacitor is implemented using a smaller capacitor and a larger capacitor isolated from the smaller capacitor by resistance. The high speed sampler of the present invention is also characterized by other optimizations, including transmission line tap compensation, stepped impedance strobe line, a multi-layer physical layout, and unique strobe generator design. A plurality of banks of such samplers are controlled for concatenated or interleaved sample intervals to achieve long sample lengths or short sample spacing. |
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DETAILED DESCRIPTION What is claimed is: 1.
A high speed sampler, comprising: a sample transmission line for transmitting an input signal; a strobe transmission line including a conductive strip for transmitting a strobe signal; and sampler circuitry having a plurality of positions coupled with the conductive strip of the strobe transmission line and coupled with the sample transmission line, which samples the input signal at the plurality of positions in response to the strobe signal to supply a plurality of samples of the input signal, wherein the plurality of samples are spaced in time on the input signal by less than about 150 picoseconds; wherein the sampler circuitry includes a plurality of diode bridge sample gates having relatively high impedance strobe line inputs connected to the sample transmission line at each of the plurality of positions.
2.
The high speed sampler of claim 1, wherein the plurality of samples are spaced in time on the input signal by less than about 30 picoseconds.
3.
The high speed sampler of claim 1, wherein the plurality of positions are uniformly spaced along the sample transmission line.
4.
The high speed sampler of claim 1, wherein the plurality of positions are non-uniformly spaced along the sample transmission line.
5.
The high speed sampler of claim 1, wherein the strobe transmission line includes balanced positive and negative strobe lines, and the sample gates each include: a plurality of diodes configured as a four terminal bridge having first, second, third, and fourth terminals; a first strobe resistor connected to the first terminal of the bridge and to the positive strobe line; a second strobe resistor connected to the third terminal of the bridge and to the negative strobe line; a tap connected to the second terminal of the bridge and to the sample transmission line; and a sample holding capacitor connected to the fourth terminal of the bridge.
6.
The high speed sampler of claim 5, wherein the resistance of the first strobe resistor and second strobe resistor are substantially higher than the impedance of the sample transmission line
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Radio 
