Hi, I have a lab assignment which I'm struggling with for about 6 days now, and it's almost complete, except:
What are the theoretical input and output impedances of the circuit in terms of the resistances R1,
R2, R3, R4 and RE ? The voltage specifications of your Schmitt trigger (the values Vturn-on, Vturn-off , Von
and Voff you report) actually depend on the input and output impedances of your trigger, the input
impedance of the load, and output impedance of the driving circuit. If you would like your circuit to
adhere to these specifications to within 1%, estimate (a) the upper limit on output impedances of
circuits used to generate input signals for your Schmitt Trigger, and (b) the lower limit on input
impedances of loads driven by your Schmitt trigger. Do the function generator and oscilloscope you
used to evaluate the circuit fall within these limits?
What are the theoretical input and output impedances of the circuit in terms of the resistances R1,
R2, R3, R4 and RE ? The voltage specifications of your Schmitt trigger (the values Vturn-on, Vturn-off , Von
and Voff you report) actually depend on the input and output impedances of your trigger, the input
impedance of the load, and output impedance of the driving circuit. If you would like your circuit to
adhere to these specifications to within 1%, estimate (a) the upper limit on output impedances of
circuits used to generate input signals for your Schmitt Trigger, and (b) the lower limit on input
impedances of loads driven by your Schmitt trigger. Do the function generator and oscilloscope you
used to evaluate the circuit fall within these limits?