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10 MHz Sampling Discriminator

IP.com Disclosure Number: IPCOM000076612D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Rowley, LG: AUTHOR [+2]

Abstract

This is a high-performance discriminator system that can operate on a single or repetitive basis up to a frequency of 10 MHz, without significant degradation in accuracy. The system operates by looking at the instantaneous amplitude of the signal during a specific time period of 400 pico seconds, and compares it to a voltage in a significantly slower time frame, such that sample resolution is within 2 millivolts of the input reference level.

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10 MHz Sampling Discriminator

This is a high-performance discriminator system that can operate on a single or repetitive basis up to a frequency of 10 MHz, without significant degradation in accuracy. The system operates by looking at the instantaneous amplitude of the signal during a specific time period of 400 pico seconds, and compares it to a voltage in a significantly slower time frame, such that sample resolution is within 2 millivolts of the input reference level.

The discriminator system is composed of a strobe generator 10, having an input 11 coupled to a probe 12 that has a tip 13 and contains a diode bridge 14 which is also coupled to an amplifier 15, and through capacitor 16 and resistor 17 to reference voltage input 18. The amplifier 15 has its output fed through tunnel- diode switch 19 to output 20.

Typically, the discriminator system is operated by triggering the strobe generator 10 with the leading edge of a pulse fed into input 11. This causes the diode bridge 14 to turn on for a 400 pico second interval, enabling the probe 12 to respond to a 400 pico second rise time. Simultaneously, a reference voltage is being fed into input 18. Any difference in voltage existing between the probe tip 13 and the reference voltage on input 18 is amplified by amplifier 15 and fed through the tunnel-diode switch 19 to output 20. Simultaneously, this difference in voltage causes the capacitor 16 to take on a charge during the time interval the diode bridge 14 rema...