In the amplifier circuit you showed, the resistor values are wrong, the transistor is not correctly biased - it is saturated, and there is no output coupling capacitor or anything to shift the DC level at the output to a suitable level for a DAC input.The transistor amp was correctly biased...
Are those rms values or pk-pk or what?...and could amplify the signal from 500mV to 4.5V
The DAC input was probably overloaded, either because the input signal amplitude was too high or the DC bias was wrong....try to convert the sampled signal back to analog using DAC. But I found that the observed signal is distorted and only had a peak of 1V.
No. In fact the output impedance is quite high.1) Is this happening due to low output impedance of the amplifier?
In the amplifier circuit you showed, the resistor values are wrong, the transistor is not correctly biased - it is saturated, and there is no output coupling capacitor or anything to shift the DC level at the output to a suitable level for a DAC input.
That's just messed up. Are you seriously trying to design the circuit by trial and error?But at the laboratory I used R1 and R3(normally Rc) as variable resistors in order to bias the transistor.
No, that just means that after you finished fiddling with the variable resistors, one of them measured 1.45k.Today I do the practical again at laboratory I found at the correctly biased point R3(normally Rc) value is approximately 1.45k ohm. So I think this this must be law for the output resistance.
Am I correct ?
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