# Electronics - Basic Op-Amp Circuits - Discussion

### Discussion :: Basic Op-Amp Circuits - General Questions (Q.No.1)

1.

The center frequency of a band-pass filter is always equal to the

 [A]. bandwidth [B]. –3 dB frequency [C]. bandwidth divided by Q [D]. geometric average of the critical frequencies

Explanation:

No answer description available for this question.

 Jayasri.N said: (Dec 13, 2010) Since aband pass filter is used to pass a particular band of frequency, the geometric average of critical frequency yields the center frequency.

 Nazeem said: (Jan 11, 2011) Critical frequency means ?

 Jejakrishna said: (Mar 1, 2011) Yes, I don't understand it

 Prashant said: (Sep 24, 2011) fc=(fh+fc)/2

 Vasu said: (Oct 15, 2011) Here what does fc on lhs and fc on rhs mean ?

 Muhammad Zeeshan said: (Dec 9, 2011) According to above formula fc=fh.

 Ranjan said: (Mar 23, 2012) fc=(fh+fl)/2

 Priya said: (Jun 17, 2012) fc = Critical frequency. fh = High frequency. fl = Low frequency.

 Rajendra said: (Sep 18, 2013) What does the critical frequency please said in detail?

 Deepak said: (Jan 2, 2014) Critical frequency is the maximum band pass frequency which allow to pass the bandwidth of the certain frequency. It is equal to the fc=fh when bandwidth is equal to 1.

 Mukesh said: (Dec 16, 2015) The center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies.

 Umesh said: (Jan 29, 2016) Critical frequency is also called as cut off frequency.

 Remya said: (Aug 17, 2016) The critical frequency of a filter is defined as the point at which the response drops -3db from the passband.

 Syed Sabeel Ali said: (Jan 15, 2018) In band pass the filter will allow frequencies abouve fl and upto frequencies below fh so the center frequency will be thus from abouve formulae it is average of these two frequency.

 B.Roy said: (Oct 3, 2018) What is the meaning of geometric average?

 Anomie said: (May 24, 2019) The center frequency Fc = (fh + fL)/2 at that time RF system or filter is in resonance mode it gives max output by the filter system in terms of power, voltage and current. Centre frequency is critical in nature with output because power current in maximum finally afterwards at that freq. System RF or filter may go to damage or heating take place component may damage.

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