MEMORANDUM

To : Dave Michelson

From : EECE 380 Team L2D8

Date : 31 March 2014

Subject : Project 2 Weekly Memo 8

INTRODUCTION

This memo outlines the progress made during the last week before the project.

PROGRESS

Hardware

With the new capacitor stocks, we finished adjusting the bandwidth of our crystal filters, ~1kHz and ~3kHz approximately.

When the RF signal is passed through the crystal ladder, there was approximately a 23 dBm loss. Therefore, we chose to build a cascode which amplifies the signal by approximately 20 dBm to compensate for the loss. The cascode is chosen due to its ability to isolate both the input and output stages, high gain and slightly wider bandwidth compared to the standard common emitter amplfier.

We also built a simple peak detector which has a stable output without any ripple. This allows for a clean input into myDAQ so that the readings are more accurate.

Software

We managed to display the xy graph in Labview as well reading the input voltage. There is also a cursor on the display that displays the values.

GOALS  FOR NEXT WEEK

1. Test the whole circuit with the RF Amplifier, Mixer, VCO, Attenuator, switch and software

2. Start designing the PCB Board

3. Include the frequency modulation Beta into Labview.