12dB/Octave 2Way Xover  LinkwitzRiley alignment and
phase coherent (uses the P09 RevB PCB)
24 dB/Octave 2/3Way LinkwitzRiley electronic crossover
 The LinkwitzRiley filter featured here has (almost)
perfect phasecoherency, with no peaks or dips at the
crossover frequency. The design is adaptable to 2way or
3way (or even 4way) operation, and all formulas)
29.85 MHz Bandpass Filter Schematic
45 to 90Hz hum filter
A Basic Introduction to Filters: Active, Passive and
SwitchedCapacitor  National Semiconductor Application
Note
A Simple Method of Designing Multiple Order All Pole
Bandpass Filters by Cascading 2nd Order Sections  AN27A
Linear Technology Presents two methods of designing high
quality switched capacitor bandpass filters. Both methods
are intended to vastly simplify the mathematics involved in
filter design by using tabular methods. The text assumed no
filter design experience but allows high quality filters
Active 2nd Order Filters  The figures below illustrate
using opamps as active 2nd order filters. Three 2nd order
filters are shown, low pass, high pass, and bandpass. Each
of these filters will attenuate frequencies outside their
passband at a rate of 12dB per octave or 1/4 the voltage
amplitude for each octave of frequency increase or decrease
outside the passband
Active Bandpass Filters
AkerbergMossberg AM Second Order Bandpass inverting
Band reject filter includes compensation  EDNDesign
Ideas Some bandreject LC filters employ a reactance to
decouple individual resonators. One such filter uses
relatively small shunt inductors to decouple series
resonators, known as a topL coupling. This type of coupling
readily achieves narrow filter bandwidths while....
BandPass Filter  This bandpass filter is in fact a
combined high and lowpassfilter. The first stages are a
highpass (f>70MHz) and the last stages a low pass
(f<180MHz). The lost of this filter is several watts when
driven with 20[Watts], but the output signal is (when
adjusted with a spectrum analyser) very clean.…
Bandpass filter features adjustable Q and constant maximum
gain  EDNDesign Ideas Applications such as audio
equalizers require bandpass filters with a constant maximum
gain that's independent of the filter's quality factor, Q.
However, all of the wellknown filter architectures—SallenKey,
multiplefeedback, statevariable, and TowThomas—suffer
from altered.
Bandpass Filter Single Opamp  A band pass filter passes
a range of frequencies while rejecting frequencies outside
upper and lower limits of passband. The range of
frequencies to be passed is called passband and extends
from a point below center frequency to a point above
center frequency where output voltage falls about 70% of
output voltage at center frequency.
Bandpass Filters
Bandpass Network  Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc.
Basic Introduction to Filters  Application notes on
active, passive and switched capacitor filters, document in
PDF format
BerkaHerpy BH Second Order Bandpass noninverting
Biquad Active Bandpass Filter Schematic
Cascade Bandpass Filters for Higher Q  EDNDesign
Ideas Switchedcapacitor filters that are preset for a
given bandwidth sometimes do not deliver the bandwidth or Q
an application requires. By inverting the clock between two
switchedcapacitor bandpass filters, such as the MSFS1 from
Mixed Signal Integration Corp
Chebyshe Volt Bandpass Filter
Chebyshe Volt/Butterworth Filters
Constantimpedance IF bandpass filters improve circuit
performance  Application Note MiniCircuits.com
Deliyannis Second Order Bandpass I inverting
Deliyannis Second Order Bandpass II inverting
Digital signal processor DSP for radio communications
DPPs Program Key Parameters of Bandpass Filter 
threeamplifier implementation of the statevariable filter
in Figure 1 provides for secondorder bandpass, highpass,
and lowpass responses. The strength of the circuit, however,
is in the bandpass response (VOUT/VIN), in which it's easy
to achieve high gain (G) and high Q.
Equal Element Filter Improves Passband Performance  EDNDesign
Ideas Designers originally conceived equalelement filters
as allpole microwave bandpass filters that provide minimum
centerfrequency insertion losses for specific values of
resonatorunloaded Q (Reference 1). All resonators of the
equalelement bandpass filter operate at the same loaded Q.
For LC filters, the equalelement filter has another
advantage.
Filter AkerbergMossberg (AM) Second Order Bandpass
inverting
Filter BerkaHerpy (BH) Second Order Bandpass noninverting
Filter Deliyannis Second Order Bandpass I inverting
Filter Deliyannis Second Order Bandpass II inverting
Filter Fliege Second Order Bandpass noninverting
Filter KHN (Inverting Input) Second Order Bandpass
noninverting
Filter KHN (NonInverting Input) Second Order Bandpass
inverting
Filter MikhaelBhattacharyya (MB) Second Order Bandpass
noninverting
Filter Multiple Feedback (MFB) Second Order Bandpass I
inverting
Filter Multiple Feedback (MFB) Second Order Bandpass II
inverting
Filter SallenKey (SK) Second Order Bandpass noninverting
Filter TowThomas (TT) Second Order Bandpass inverting
Filter TwinT Second Order Bandpass inverting
Fliege Second Order Bandpass noninverting
High Dynamic Range Bandpass Filters for Communications 
DN37 Design Notes (Linear Technology)
KHN Inverting Input Second Order Bandpass noninverting
KHN NonInverting Input Second Order Bandpass inverting
LC filter design
Linkwitz Cosine Burst Generator  part of speaker
measurement set described in the construction article
Linkwitz Transform Circuit  The Linkwitz Transform
circuit  an equaliser to provide extended bass response
LowSensitivity, Bandpass Filter Design with Tuning Method
 National Semiconductor Application Note
Method of Designing Multiple Order All Pole Bandpass Filters
by Cascading 2nd Order Sections  AN27A Linear
Technology Presents two methods of designing high quality
switched capacitor bandpass filters. Both methods are
intended to vastly simplify the mathematics involved in
filter design by using tabular methods. The text assumed no
filter design experience but allows high quality filters.
Micropower Bandpass Network  Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc.
MikhaelBhattacharyya MB Second Order Bandpass noninverting
Multiple Feedback Bandpass Filter
Multiple Feedback Bandpass Filter
Narrow Band Audio Bandpass Filter
OA28: OA28 LowSensitivity, Bandpass Filter Design with
Tuning Method  National Semiconductor Application Note
SallenKey SK Second Order Bandpass noninverting
Self Tune Filter
signal processor DSP for radio communications
Simple Method of Designing Multiple Order All Pole Bandpass
Filters by Cascading 2nd Order Sections  AN27A Linear
Technology Presents two methods of designing high quality
switched capacitor bandpass filters. Both methods are
intended to vastly simplify the mathematics involved in
filter design by using tabular methods. The text assumed no
filter design experience but allows high quality filters.
Single OpAmp Bandpass Filter  A bandpass filter passes
a range of frequencies while rejecting frequencies outside
the upper and lower limits of the passband. The range of
frequencies to be passed is called the passband and extends
from a point below the center frequency to a point above the
center frequency where the output voltage falls about 70%
TowThomas TT Second Order Bandpass inverting
TwinT Second Order Bandpass inverting
Ultra Pure 125khz Sine Wave Signal Source  For some
RFID systems operating at 125KHz, a very low distortion
signal source reference is needed. The circuit shown on
this page produces a 10volt peaktopeak signal into a
50ohm load, with a distortion of only 0.01%.
