EECE 380 – Design Studio III
Technical Memo 4
Project Team: L1—B4
Names and Student Numbers:
Omar Omari
54434105
Michael Long Li
28084101
Qian Fang
55983100
Nat Wongpatimachai
54589106
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Team Organization Meeting – Outcomes
Tuesday 8th October, 2013:
Michael and Frances were working in the mixer and vco combination. They were able to control
frequency using voltage, but having trouble with combining with the mixer. Two solutions came
up, one is trying with another design with the same chip, the other one is using a different vco.
Figure
1:
Figure 1 shows the Voltage vs Frequency of the VCO in volts and Megahertz.
Omar and Nat further debugged the peak detector circuit to using the RF frequency generator
and oscilloscope to determine whether the overall output of the circuit matched our expectations.
As a result, the following graphs were obtained:
Figure 2: Sinusoid input signal (Yellow), peak detector output (Blue)
Figure 3: Square input signal (Yellow), peak detector output (Blue)
Thursday 10th October, 2013:
With the combination of VCO and the two mixers, the output signal got attenuated. So we
connected an amplifier from our tool kit. However, there was so much noise from our circuit that
we got very little output from the bandpass filter even with our narrow 8 kHz bandwidth.
Therefore, we need to do more testing on it.
Tasks:
- integration of circuits
- Testing the output of mixer and bandpass.
- Making lookup tale with respect to the RF generator.
Sunday 13th October, 2013
Omar and Frances built the lowpass Video filter and then connected it to the output of the peak
detector circuit. Next, the bandpass filter, peak detector, and video filter circuits were all
connected together and tested by inputting an a signal from the RF frequency generator and then
displaying the overall output signal on the oscilloscope. Omar and Frances decided that the video
filter was not necessary until the VCO circuit output is connected to the bandpass circuit input.
The output of the overall circuit would allow us to determine whether or not we need a video
filter before sending the signal to the MyDAQ.
We are able to activate our labview software from the trial version into the fully licensed
product. We start testing the software by making it display the Vin and Vout from the MyDAQ
analog output and the peak detector that are both taken in via analog input channels. We are also
able to create a lookup table to compare those two value and display our diagram in labview.
Monday 14th October, 2013
In today’s meeting, we had a look into the method of making a graph from an array of numbers,
and also the ‘if statement’ (case structure) in labview. A few possibilities for the overall design
of the virtual instrument were also discussed.