High Speed Pulse Generation Characterization Report By:Mironov Artiom Instructor: Yossi Hipsh

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.

Overview 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.

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.

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

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.

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:

Proposed Solution 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:

Proposed Solution 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.

Proposed Solution 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:

Proposed Solution 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 GHz range.

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