Electronics and Communication Engineering - Analog Electronics - Discussion

Discussion Forum : Analog Electronics - Section 1 (Q.No. 45)

Analog Electronics

45.

Study the circuit of figure and examine the following statements

It is an active low pass finer.
It is a second order filter.
The change in gain is 40 dB/decade.

Which of the above statements are correct?

1, 2 and 3

1 and 2

1 and 3

2 and 3

Answer: Option

Explanation:

The circuit is a second order active low pass filter for which gain is 40 dB/decade.

Discussion:

11 comments Page 1 of 2.

HALKUDE VAISHNAVI said: 4 years ago

Thank you for explaining the answer @Pavithra.

Wolly said: 6 years ago

Thank you @Pavithra.

Row said: 6 years ago

Thanks @Pavithra.

Jsree said: 7 years ago

Thanks alot @Pavithra.

Sandeep said: 8 years ago

Thanks for the explanation @Pavithra.

Karthik said: 8 years ago

Thank you for explaining it.

Ramesh said: 8 years ago

Thank you @Pavithra.

Swati said: 8 years ago

Thank @Pavithra.

Pavithra said: 8 years ago

1) It is an active filter since opamp is used. In this resistor and then capacitor used, so we conclude that which is low pass filter.
2) It is second order since two combinations of resistor and capacitor used.
3) For first order filter gain is 20db produced by one pair of resistor and capacitor.
For second order filter gain is 40 db produced by two pair of resistor and capacitor.

(4)

Igor said: 9 years ago

This is a Sallen-Key second order low pass filter with gain.

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