NOTE ON TRANSISTORS FOR AVALANCHE-MODE OPERATION

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We have found that selected Motorola transistors of the MM-486, MM-487, and MM-488 type are quite useful for avalanche-mode operation. Figure 1 shows a circuit used in conjunction with a traveling-wave oscilloscope for selecting avalanche units. The output of the line-type pulse generator is 40 to 60 volts (either polarity of output pulse is available), and the rise time is less than 0.5 nsec. Figure Z shows a plot of the static V-I characteristics of the collector-to-emitter junction for various units, avalanching and nonavalanching. A transistor that avalanches will do 80 over the entire flat portion of the V-I characteristic. ... continued below

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Miller, Harold W. & Kerns, Quentin A. March 1, 1962.

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Description

We have found that selected Motorola transistors of the MM-486, MM-487, and MM-488 type are quite useful for avalanche-mode operation. Figure 1 shows a circuit used in conjunction with a traveling-wave oscilloscope for selecting avalanche units. The output of the line-type pulse generator is 40 to 60 volts (either polarity of output pulse is available), and the rise time is less than 0.5 nsec. Figure Z shows a plot of the static V-I characteristics of the collector-to-emitter junction for various units, avalanching and nonavalanching. A transistor that avalanches will do 80 over the entire flat portion of the V-I characteristic. One can expect that 10 to 30% of the transistors will avalanche. There is some indication that the low-beta type (MM-486) give the best yield. There is a time delay of a few nanoseconds between application of a trigger pulse and the rise of the main avalanche current. Figures 3 and 4 shows this delay, measured between the 50% point of the trigger-voltage waveform and the 50% point of the avalanche output waveform, as a function of trigger-voltage amplitude (Fig. 3) and static-collector current (Fig. 4). The negative-resistance region (such as that in Fig. 2) should be avoided if time and amplitude jitter of the output pulse are to be minimized. A temperature change from 70 to 150 F has negligible effect on time delay, but raises the breakdown knee (Fig. 2) to higher current (e. g., from 2 x 10{sup -3} to 8 x 10{sup -3} {micro}a).

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  • Report No.: UCRL-10131
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/970035 | External Link
  • Office of Scientific & Technical Information Report Number: 970035
  • Archival Resource Key: ark:/67531/metadc927591

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1962

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 3:52 p.m.

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Miller, Harold W. & Kerns, Quentin A. NOTE ON TRANSISTORS FOR AVALANCHE-MODE OPERATION, report, March 1, 1962; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc927591/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.