Hence the voltage at the inverting input terminal decreases to –I 1R s because the negative feedback tends to maintain a differential voltage of zero. ![]() in this case an input current I 1 produces a drop (I 1R s) across R s. Voltage follower with zero input voltage and a source resistance R s is shown in Figure (b). This current creates a voltage drop across R f is the output terminal and hence the output error voltage is I 1R f. The small input current I 1 through R f from the output terminal. Ideally the current through Rin is zero because the input voltage is zero and the voltage at the inverting terminal (-)is zero. ![]() Figure (a): Inverting Amplifier With Error Voltage An inverting amplifier with zero input voltage is shown in below Figure (a). ![]() Mostly the bias current problem is produced in inverting and non-inverting amplifier and in voltage follower. The ideal OP-AMP has no input current, but infact, the practical OP-AMP has small input bias current typically in the nano ampere range. Transistor’s within the OP-AMP must be biased so that have the current values of base and collector current and collector to emitter voltages.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |