International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada / This paper describes the technical principle that signals conversion, data-processing and data storage are directly carried out without filling up with the reference pulse for PPM and PPK (pulse position keying). By means of analysis for typical frame structure of PPM/PPK signals, a variety of math models of signal time relationship of the system were found, and based on this, a engineering way and a principle block diagram for signals conversion, data processing and data storage were given out.

Στην παρούσα διπλωματική εργασία παρουσιάζεται ο σχεδιασμός και η υλοποίηση ενός καινοτόμου μετατροπέα σήματος (D/A converter ή DAC) με τη δυνατότητα εξωτερικής ρύθμισης (offline calibration) για μετατροπή υψηλής ακρίβειας, η οποία εξασφαλίζει υψηλή γραμμικότητα ανεξαρτήτως της ανοχής των στοιχείων που τον απαρτίζουν. Μόλις ο μετατροπέας ρυθμιστεί κατάλληλα, λειτουργεί αντίστοιχα με ένα DAC, όπου όλα τα στοιχεία του έχουν υποστεί επεξεργασία με λέιζερ (laser trimmed DAC), αλλά χωρίς το υψηλό κόστος κατασκευής που συνεπάγεται η παραπάνω διαδικασία, με αποτέλεσμα να αποτελεί μία ιδανική οικονομική λύση για εφαρμογές που απαιτούν υψηλή ακρίβεια μετατροπής. / This diploma thesis presents the design and implementation of an innovative Digital to Analog Converter (DAC) with the capability of offline external calibration for accurate measurements, which guarantees high linearity regardless of the mismatch of its components. Once the converter has been configured, it can attain the same linearity performance as a laser trimmed DAC, but without the high manufacturing costs involved in the laser etching process, making it an ideal low-cost solution for high accuracy applications.

The objective of this thesis is a design of a development kit, which is used in laboratories during the lessons of Theory of analog to digital conversion subject. This device is adapted for basic measuring and understanding of digital to analog (D/A) and analog to digital (A/D) converters and contains sigma-delta A/D converter made of basic elements, D/A converter with R-2R resistor net, active low pass frequency filter (Sallen-Key), PWM generator, SAR A/D converter with 16 b resolution, reference voltage source and module for measuring integral and differential nonlinearity of A/D converters. The modules are available connect to each other via jumpers and they are driven by microcontroller. This solution gives various modes of operation, which can be selected by user via buttons. Development kit has five BNC connectors for securing connectivity to an oscilloscope or a signal generator. The device also contains universal serial bus connectivity for use with personal computer or laptop, which is really useful with Matlab software for automation processing of measuring.