100

1k

10k

100k

400k

FREQUENCY (Hz)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

DC GAIN =

= -14.8 dB

Q =

11

2

=

1

2

1

and

Q =

LMV771, LMV772, LMV774

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SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010

(26)

A design example is shown here:

Designing a bandpass filter with center frequency of 10kHz and Quality Factor of 5.5

for the capacitors and resistors, Q reduces to:

(27)

or

(28)

Also, for f = 10kHz, the center frequency is

The following graphs show the transfer function of each of the filters. The DC gain of this circuit is:

The frequency responses of each stage of the state variable active filter when implemented with the LMV774 are

shown in the following figures:

Figure 14. Lowpass Filter Frequency Response

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Product Folder Links: LMV771 LMV772 LMV774