TS615IPWT datasheet(31/36 Pages) STMICROELECTRONICS

Il numero della parte	TS615IPWT

Spiegazioni elettronici	DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT

PDF	36 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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Choosing the Feedback Circuit

TS615

31/36

10.2 Active filtering

From the resistors Rfb and RG we can directly calculate the gain of the filter in a classical, non-inverting

amplification configuration:

We assume the following expression as the response of the system:

The cutoff frequency is not gain-dependent and so becomes:

The damping factor is calculated by the following expression:

The higher the gain the more sensitive the damping factor is. When the gain is higher than 1, it is

preferable to use some very stable resistor and capacitor values. In the case of R1=R2:

Figure 72. Low-pass active filtering. Sallen-Key

Rfb

910

Ω

TS615

Ω

OUT

Rfb

910

Ω

TS615

Ω

OUT

----------

Vout

Vin

-------------------

-------

()

--------------

---------------------------------------------

R1R2C 1C2

--------------------------------------

---

–

()

----------

–

------------------------------------

TS615IPWT Scheda tecnica(PDF) 31 Page - STMicroelectronics