Amfutacce na Tashin Amfutar Da Ba A Cikanta (OP Amp): Tsarin & Gain

Amplifayi mai tsari shi ne amplifayin da ya yi amfutuwa da zahiri mai tsari.

A amplifayin mai tsari ko op-amp mai tsari yana amfani da op-amp a matsayin muhimmin adadin.

A op amp akwai biyu masu siffar (pins). Wanda ta fi dace ita ce na minus sign (-), kuma wanda ba ta fi dace ita ce na plus sign (+).

Idan a bayar waɗannan siffar mai tsari, ba za a yi lissafin tsarin idan an yi amfutuwa a cikin terminali mai amfutuwa.

Saboda haka, a wannan lokaci, amfutuwarsa ta zai zama mafi tsari.

Yana da kyau a tuntubi masu shirya tun da ake samun circuit of op-amp with the feedback loop as shown below,

A cikin circuit na faru, ana haɗa resistance R1 and feedback resistance Rf a siffar mai dace. Idan a yi amfani da Kirchhoff Current Law, za a samun,

Idan a nemi voltage applied to the non-inverting terminal is vi.

Idan a nemi op-amp in the circuit is ideal op-amp, then,

Therefore, equation (i) can be rewritten as,

A closed-loop gain of the circuit is,

This term does not contain any negative parts. Hence, it proves that the input signal to the circuit gets amplified without changing its polarity at the output.

From the expression of the voltage gain of a non-inverting op-amp, it is clear that the gain will be unity when Rf = 0 or R1 → ∝.


So, if we short circuit the feedback path and/or open the external resistance of the inverting pin, the gain of the circuit becomes 1.

This circuit is called a voltage follower or unity gain amplifier. This is used to isolate two cascaded circuits, because of its infinitely large impedance, at op-amp inputs.

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