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| Precision Supercomponents For Critical Applications PSC-4490 22.6 MHZ NYQUIST BANDPASS FILTER FOR DIGITAL TO ANALOG CONVERTER FEATURES * * * * * INVERSE SINC, SQUARE ROOT NYQUIST ( ARBITRARY SHAPING AVAILABLE) FLAT GROUP DELAY SHARP ATTENUATION COMPACT SIZE FREQUENCY RANGE; 1 MHZ - 3000 MHZ DESCRIPTION The Comstron Model PSC-4490 is a Nyquist bandpass filter used in a DAC( digital to analog converter). The purpose of the filter is to normalize the amplitude response of an input (Sin x)/x signal spectrum, and to reject unwanted frequencies while maintaining low group delay variation in the passband. The equalizing ) --------shape over the passband is |x/sin x|2 where x = ( f - fs and fs=50.0 MSPS (sampling rate). PSC-4490 PSC-4490 SPECIFICATIONS CHARACTERISTICS PASSBAND 200 HZ TO 22.6 MHZ EQUALIZING SHAPE 20LOG(X/SINX) DB VSWR INSERTION LOSS GROUP DELAY VARIATION OVER .6 TO 22.6 MHZ STOPBAND REJECTION AT 3 HZ AND BELOW AT 27.4 MHZ AND ABOVE AT 38.75 MHZ AND ABOVE >60 DB > 30 DB > 50 DB 15 NS WITHIN .075 DB <1.15:1 < .1 DB <1.2:1 6.0 .5 DB AT 200 HZ < 20 NS - RESPONSE CURVES TYPICAL LIMITS OUTLINE DRAWING 3.50 Figure 1: Overall Response 2.00 1.00 MAX .25 .25 1.00 .25 .25 Figure 2: Passband Response Precision Supercomponents For Critical Applications 35 South Service Road Plainview, NY 11803 TEL: 516-694-6700 FAX: 516-694-2562 |
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