Takaitaccen Bayanin da Turanci a Cikin Op amp da Kafin Gainsu na Op amp

Takardarwa Na'urori a Op Amp

A nemi takardarwa na'urori a op amp daga tafkin op amp zuwa tafki na inverting input terminal ta da sabbin resistance kamar yadda ake nuna a nan.

Gain na op amp ta da takardarwa na'urori an sanin closed loop gain.

Closed Loop Gain of Op Amp

Idan muna ce resistance feedback da resistance in series da inverting input terminal na op-amp kamar yadda ake nuna a sune, gain na system ya zama negative ratio na feedback resistance zuwa input resistance. Operational amplifier na gain. Gain ya fi shi da yawa da ake amfani da shi. A zan iya jin gain na ake baka zuwa system ba tare da gain na op amp (open loop gain). Muna yi wannan ta hanyar zaɓe values na series input resistance (Ri) da feedback resistance (Rf). Gain na op-amp system ya kamata

Don fahimtar closed loop gain na 741 op amp, muna da misal. 741 operational amplifier na following perameters.

Muna da ɗaukan closed loop gain na op amp idan muna ce 10 kΩ resistance in series with the inverting terminal and a 20kΩ resistance as feedback path.

Equivalent circuit na op amp da input source ya zama kamar yadda ake nuna,

Muna da assumptions, voltage a node 1 ita v. Daga baya muna apply Kirchhoff current law a wannan node. muna samu,

Daga baya muna apply Kirchhoff current law a node 2 muna samu,

Daga baya, dari figure ita cewa,

Daga equation (i) da (ii) muna samu,

Saboda haka, open loop gain na op amp ita, 2 × 105.
saboda haka closed loop gain ita 2.

Muna da misal na closed loop gain of an op amp.

Equivalent circuit na above 741 op amp circuit muna koyarwata,

Daga baya, muna da assumptions, voltage a node 1 ita v applying Kirchhoffs current law a node 1. Muna samu,