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Digital Peak Detecting and Ripple Testing Device

IP.com Disclosure Number: IPCOM000082412D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Chambers, RL: AUTHOR [+2]

Abstract

The system as depicted schematically is capable of measuring maximum and minimum voltages and AC ripple on a DC signal.

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Digital Peak Detecting and Ripple Testing Device

The system as depicted schematically is capable of measuring maximum and minimum voltages and AC ripple on a DC signal.

The ripple testing device consists of a high speed analog-to-digital (A/D) converter 10 to digitize the waveform. The digital output of the A/D converter 10 is fed simultaneously into digital comparator 12 and digital comparator 14. The A sides of comparators 12 and 14 are compared to the B sides, and the high and low readings are stored on the output of the storage registers 16 and 18.

In operation, a number of samples is predetermined by an operator so that at the completion of the predetermined count, the maximum and minimum readings may be presented for readout or printing. Initially, storage register 16 which stores the maximum reading is set to 0. As such, the B side of digital comparator 12 is also set at 0. Likewise, storage register 18 which stores the minimum readings is set to 2/n/, where n is the number of bits to be compared. Of course, the setting will be in digital form.

The input wave shape is sampled by A/D converter 10 and presented to the A side of the comparators 12 and 14 simultaneously. A decision is made by each comparator, and based on the decision, the reading is transferred to the B side of each of the digital comparators. If the reading is greater than 0 (for digital comparator 12) or less than all 1's (for digital comparator 14), the reading is gated to the B side of th...