- Characterize an RC filter and plot its frequency response and phase shifts.
- Measure the IV characteristics of a 4148 diode, and plot the dependence of the threshold voltage on temperature.
A simple low-pass RC filter was made with a 10K resistor and 1uF capacitor. The input was taken from the programmable sine wave generator, and simultaneously monitored via CH1 . The output(midpoint of R and C) was also monitored via CH2.
Frequency was swept from 10Hz to 500Hz, and the amplitude and phase plots are shown
Photograph of the setup:
A 4148 diode’s IV characteristics are plotted.
Input is taken from a 0-3.3V DAC (PVS3) , and fed to a 4148 diode via a 1K resistor. The other end of the diode is grounded via a current to voltage convertor.
IV plots are obtained by plotting the voltage across the diode versus the current
Set the base current using the constant current source.
sweep the collector voltage, and simultaneously monitor I_ce