DC accurate filter eases PLL design
Nello Sevastopoulos and Phillip Karantzalis
Abstract
The LTC1062, a versatile, DC accurate, instrumentation lowpass filter with gain and phase that closely approximate a 5th order Butterworth filter, is described.
Keywords
Filter design
DC accurate filter
LTC1062
The LTC1062 is a versatile, DC accurate, instrumentation lowpass filter with gain and phase that closely approximate a 5th order Butterworth filter. The LTC1062 is quite different from presently available lowpass switched capacitor filters because it uses an external (R,C) to isolate the IC from the input signal DC path, thus providing DC accuracy. The DC accurate output, pin 7 of Figure 480.1, is buffered by an internal op amp ...
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