High Speed Pulse Generation Characterization Report

1. High Speed Pulse GenerationCharacterization Report Spring 2009 (Single Semester) By: Mironov Artiom Instructor: Yossi Hipsh

2. Overview • The current project is a part of large research, being performed by EE Technion faculty. • The research works on problems of wireless connections and implements new algorithm of blind receiving. • The receiver has no information about carrier signal (phase, frequency), but using special signal, as LO, manages to retrieve the modulated info signal.

3. Overview(cont.) • Symbolical Block Scheme of receiver shown in Pic. 1.1 • This special signal is periodic signal consisted of ones and zeros, for example as signal shown in Pic. 1.2 • Our goal is to produce this fast I-O pulse function used, as LO at mixer and to implement it in the suggested receiver. Pic. 1.1 Pic. 1.2

4. Project Milestones • Learning of high-speed technologies and devices. • Searching for an optimal, suitable solution. • Exploration of alternative methods. • Designing the whole pulse formation system. • System verification at lower speed characteristics (5-10 GHz). • Demonstration of possible system upgrade up to 20 GHz, within the current design with minor modifications.

5. Specifications • High speed pulse signal up to 20 GHz operating frequency. • Time pulse requirement • The signal is periodic, consisted of 6-8 pulses.

6. Implementations • High operating frequency of mixer. • Digital Scope can be used as DSP component, due to its memory and large variety of math functions. • Fast logical components. • It is possible to use Pulsar system, as component in our system.

7. Proposed Solution • Block Scheme, using pulsar to produce 20 GHz signal: • In current solution we use Pulsar as initial signal generator. As it arises from experiments with Pulsar, it is able to produce pulses at 3 GHz frequency, that look like: Pic. 3 Pic. 4

8. Proposed Solution(cont.) • As it can be seen signal produced by Pulsar is not sharp enough, beside the fact that it’s basic frequency is 3 GHz. • So first we want to proceed the obtained signal from pulsar through buffer component, that makes signal look more like pulse. We want the resulting signal look like: Pic. 5

9. Proposed Solution(cont.) • Then we split the signal to two channels, while delaying one of them, thus we obtain 50 psec pulse, corresponding to 20 GHz frequency, as AND product. (Pic. 6) • The delaying unit can be implemented by alteration of transmission line length. Pic. 6

10. Proposed Solution(cont.) • After splitting the signal to 6, we delay each one at needed interval, and then proceed them through OR gate, so we obtain: • AND components can be optionally added at point 4, so we can control which pulse will be used in signal and which not: Pic. 7 Pic. 8

11. Proposed Solution(cont.) • After exploring the components we discovered some, that meet the requirements. • INPHI corporation provides logical components (OR, AND gates), splitters (fan-outs) and demultiplexers working at up to 50 GHz frequencies. Same components are also available at lower frequencies, such as 12.5 and 25 GHz. • Hittite and On-Semi corporations also provide logical components and splitters at quite high frequencies, based on ECL and CML technologies. The available frequencies are at 8-20 GHz range.

12. Gantt Chart Practical Work Finished Final Report Making Purchase Semi Report Char-ion Report