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ADC/MCA Module With PC Interface (RS232/RS485/USB/Ethernet). Georgi Georgiev , Ivaylo Peev Institute For Nuclear Research And Nuclear Energy Bulgarian Academy Of Sciences. The Goal. Building a combination of fast ADC with low differential non-linearity (DNL) and multi-channel analyzer.

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Adc mca module with pc interface rs232 rs485 usb ethernet

ADC/MCA Module With PC Interface(RS232/RS485/USB/Ethernet)

Georgi Georgiev, Ivaylo Peev

Institute For Nuclear Research And Nuclear Energy

Bulgarian Academy Of Sciences

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


The goal
The Goal

  • Building a combination of fast ADC with low differential non-linearity (DNL) and multi-channel analyzer.

  • Compact size.

  • Operate multiple ADC/MCA modules by one computer.

  • Remote operation and management over TCP/IP.

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


The solution
The Solution

  • Using Gatti correction proposed by C. Cottini, E.Gatti and V.Svelto in 1963.

  • Involving modern technology.

    • Fast A/D and D/A converters.

    • Programmable logic devices.

    • “Smart” approach.

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Implementation
Implementation

Electronic

Control DAC

Pile Up

Gate

ADC with S/H

Input

stages

ADC/MCA

Control

Logic

&

RAM

FPGA

Input

Processor

Precise DAC

PC Interface

(USB/Ethernet)

Peak

Detector

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Main points
Main Points

  • Precise peak detector used for accurate start of measurement process.

  • Fixed dead time differential input ADC with S/H.

  • Only one precise voltage reference source is used in order to minimize possible errors.

  • Predefined spectra capture time (Live time).

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Main points1
Main Points

  • High precision DAC used to shift the measurement point on each event.

  • 4-channel DAC used to control LLD, ULD and other parameters.

  • Fully buffered spectra capture and transfer.

  • Micro-controller manages the communication channel and handles the protocol.

  • Optically isolated interface (RS232/485/USB).

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


The device
The device

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Features and performance
Features and performance

  • Total processing time of 640ns.

  • No added dead time for pulses with 125ns shaping time.

  • 1k, 2k and 4k channel spectra captured.

  • Digital control of LLD, ULD and other front-end parameters.

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Software
Software

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Sample results
Sample results

25.19 KeV

8.04 KeV

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Possible signal sources
Possible signal sources

  • SDD detectors.

  • NaI(Tl) scintillators.

  • Conventional detectors.

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


Applications
Applications

  • Fast on-line analysis.

  • Analysis using high intensity sources.

Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences


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