Memorandum
EECE 380 Group L2B1
To: David Michelson, Associate Professor, UBC
From: Yuan Liu, Student
Date: February 23rd, 2014
Subject: Weekly Review
Dear Dr. Michelson,
In this week, we finished most of the parts individually. For the hardware part, our group members managed to make the precision peak detector. With the 10 MHz op amps, our precision peak detector is now able to eliminate the 1 dB power inaccuracy during measurement. Besides, we built the video filter by a simple RC circuit, but during testing and troubleshooting, the circuit could not decrease the noise to a desired level. This problem was probably caused by the miscalculated resistor and capacitor values. After discussion, our group members decided to try another way to create the low-pass filter next week.
For the software part, we have made a progress in building the ramp and display. Using the Convert from Dynamic Data block, we could transform the sawtooth wave into a discrete one-dimensional array. Next, after implementing several math algorithms, we bundled the x and y inputs together and fed the signal into a display on the front panel. However, the algorithms still need to be calibrated to make sure that an appropriate x range can be displayed. In addition, our group members found a log algorithm available in LabVIEW, which was helpful to develop the logarithmic amplifier.
Next week, our goal is to assemble all the parts together and start testing and troubleshooting the spectrum analyzer project as a whole. Our hardware group needs to make a decent video filter to decrease the noise level on the display. For the software part, we should focus on testing and analyzing, and further adjust our algorithms.
With Regards,
Yuan Liu