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When OP is unstable ,and it connects as closeloop , what is its output and freq , or its relationship ? if the output is not VDD or GND , just like the osc application
When the opamp with feedback does not function as a stable amplifier - and when at the same time its output is neither at Vdd nor at Vcc (or ground in case of single supply) it probably will oscillate at a frequency fo. This frequency fo can be found in the BODE plot of the loop gain where the magnitude is 0 dB.
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