Hello!
http://images41.fotosik.pl/134/2106477a4e79a5d9.jpg
Can anybody help me to solve this exercise about operational amplifiers. I tried to redraw it in a little bit simpler way, then calculate Zz, which is equivalent impedance for three resistors and one capacitor above second amplifier. I am not sure which resistors I can erase (treat them as short) and why. If I would know which resistors I can erase, I would be able to see what op-amps these are (inverting, non-inv., summing, differential, voltage comparator with or without hysteresis). Then it should be relatively easy to calculate K(j omega). But what about (c) determining the allowed range for Uin if the output voltage of both op-amps cannot exceed +-Usat=15V?
Greetings!
http://images41.fotosik.pl/134/2106477a4e79a5d9.jpg
Can anybody help me to solve this exercise about operational amplifiers. I tried to redraw it in a little bit simpler way, then calculate Zz, which is equivalent impedance for three resistors and one capacitor above second amplifier. I am not sure which resistors I can erase (treat them as short) and why. If I would know which resistors I can erase, I would be able to see what op-amps these are (inverting, non-inv., summing, differential, voltage comparator with or without hysteresis). Then it should be relatively easy to calculate K(j omega). But what about (c) determining the allowed range for Uin if the output voltage of both op-amps cannot exceed +-Usat=15V?
Greetings!