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The 155-0078 and its test fixture were designed by [[John Addis]] for the [[485]] scope <sup>(Note 1)</sup>, which uses no less than 18 of these chips in various grades. | The 155-0078 and its test fixture were designed by [[John Addis]] for the [[485]] scope <sup>(Note 1)</sup>, which uses no less than 18 of these chips in various grades. | ||
The | The last two digits of the part number, the grade, correspond to a combination of DC and HF performance. | ||
Each M84 was tested for DC performance and HF performance. | |||
DC performance was tested using a custom fixture described below. | |||
HF performance was tested using the [[25ps Push-Pull Pulse Generator]]. | |||
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