Could someone give me a reality check on the differences between my measurements made with a scope and my spice simulation for this simple rectifier circuit. I'm new to using SPICE simulation.
According to the SPICE simulation I should see approx 1.74 VDC with less than 2mV ripple (assuming I am reading the graph correctly). My measurements give me 1.91VDC with about 10mV ripple.
So, have I left out something? What else explains the difference?
I measured the cap and put the measured value in the SPICE simulation. The load resistor is pretty close to its stated value.
Also, looking at the scope image, what accounts for the different heights of the ripples? Slight differences in diodes? What does the shape of the ripple reveal about the capacitor performance or circuit design?
Sinewave source is a HP signal generator, using its 50-ohm output through a 50-ohm terminator to the circuit. Scope input signal (top trace) is measured directly at the circuit input. Output ripple (bottom trace) is measured by a Differential Amp plugin in my scope. DC output across resistor 1.91VDC measured with external bench digital meter.
Thanks,
Keith Ostertag
According to the SPICE simulation I should see approx 1.74 VDC with less than 2mV ripple (assuming I am reading the graph correctly). My measurements give me 1.91VDC with about 10mV ripple.
So, have I left out something? What else explains the difference?
I measured the cap and put the measured value in the SPICE simulation. The load resistor is pretty close to its stated value.
Also, looking at the scope image, what accounts for the different heights of the ripples? Slight differences in diodes? What does the shape of the ripple reveal about the capacitor performance or circuit design?
Sinewave source is a HP signal generator, using its 50-ohm output through a 50-ohm terminator to the circuit. Scope input signal (top trace) is measured directly at the circuit input. Output ripple (bottom trace) is measured by a Differential Amp plugin in my scope. DC output across resistor 1.91VDC measured with external bench digital meter.
Thanks,
Keith Ostertag
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