T
treez
Guest
Hello,
Is R14 going to be OK for use as a loop injection resistor for feedback loop measurement? (attached schematic & LTspice simulation).
Also, the opamp, U2 , is included purely for ensuring that the feedback loop measurement can be successful. (low impedance of opamp output is needed)
That is, R14 and U2 (opamp) are added so that the gain and phase of the feedback loop can be measured with a frequency analyser.
The following article states that the impedance seen looking from either side of the injection resistor should be high one way and low the other...
Page 1, second text block down...
**broken link removed**
Do you think that such a method would give successful feedback loop measurement? (gain and phase margin).
Is R14 going to be OK for use as a loop injection resistor for feedback loop measurement? (attached schematic & LTspice simulation).
Also, the opamp, U2 , is included purely for ensuring that the feedback loop measurement can be successful. (low impedance of opamp output is needed)
That is, R14 and U2 (opamp) are added so that the gain and phase of the feedback loop can be measured with a frequency analyser.
The following article states that the impedance seen looking from either side of the injection resistor should be high one way and low the other...
Page 1, second text block down...
**broken link removed**
Do you think that such a method would give successful feedback loop measurement? (gain and phase margin).