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Passive Filters:  Notch Circuits
Passive Filters -- Main Page


Last Updated: October 24, 2017 02:55 PM

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Notch Filter is DC Accurate-  03/02/95 EDN Design Ideas:  Most active filters exhibit noise, distortion, gain error, and dc offset.  However, a filter topology that separates the dc and ac paths can eliminate the last two of these unwanted behaviors (Fig 1a).  The dc path in this circuit has no op amps and, therefore, no dc offset.  The dc path does not have a dc gain error other than -6 dB of attenuation that the R1/R2 divider causes. (This attenuation is absent if you omit the R2 termination. ) The ac path consists of C1 and a synthetic inductor comprising two wideband transconductance amplifiers and associated components.  The result is an active circuit that emulates the passive filter of Fig 1b __ Circuit Design by Gary Sellani, Maxim Integrated Products, Sunnyvale, CA

RC Notch Filter (Twin T)-  The twin T notch filter can be used block an unwanted frequency or if placed around an op-amp as a bandpass filter.  The notch frequency occurs where the capacitive reactance equals the resistance Xc=R and if the values are close, the attenuation can be very high and the notch frequency virtually eliminated __ Designed by Bill Bowden

WIDE BANDWIDTH LOW COST SAW NOTCH FILTERS-  Surface Acoustic Wave (SAW) Notch Filters have been fabricated in the past with limited success.  A prevailing problem has been stopband null depth and bandwidth versus a reasonably broad passband response.  Typically, notch filters developed in the past have achieved either one or the other.  Notch Filters using the Single Phase Unidirectional Transducer ( SPUDT) SAW notch element have achieved good null depth __ Designed by P.A. Lorenz and D.F. Thompson

Passive Filters:  Notch Circuits


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