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| KR Electronics, Inc. KR 2388 Root Raised Cosine Filter General Description KR Electronics designs and manufactures filters that approximate the raised cosine response. These filters are available as both the cosine response and the root cosine response. Symbol rates to 75 MHz have been designed. They are also available with and without sin(x)/x compensation. Various roll off factors alpha () are also available. Typical values for fall in the 0.3 to 0.5 range. www.krfilters.com Features * Root raised cosine response * Closely matches the ideal response * Sin(x)/x available * Equalized for linear phase * Supplied in phase matched pairs KR's filters closely match the mathematical ideal response to the -12 dB frequency and are most often designed for linear phase to the -3 dB response. Phase matching in pairs is also commonly specified. KR 2388 is a root raised cosine filter without sin(x)/x compensation, Fs=2 MHz and =0.35. The typical response of KR 2388 root raised cosine is shown in the plots below. Typical Performance Figure 1 shows the ideal response, while Figures 2-6 show actual measured data from a typical filter. Ideal Response (5 dB/div) 0.1 to 1.5 MHz 18 Jan 2001 09:47:08 CH1 MEM LOG 5 dB/ REF 0 dB CH1 S31 LOG Actual Filter Response (5 dB/div) 0.1 to 1.5 MHz 18 Jan 2001 09:47:33 5 dB/ REF -.75 dB PRm PRm Cor Cor START . 100 000 MHz STOP 1 . 500 000 MHz START . 100 000 MHz STOP 1 . 500 000 MHz Figure 1 Figure 2 (c) 2001, KR Electronics, Inc. Page 1 KR Electronics, Inc. www.krfilters.com KR 2388 Root Raised Cosine Filter Typical Performance (cont.) Deviation From Ideal Response (1 dB/div) .1 to 1.5 MHz 18 Jan 2001 09:49:58 CH1 S31 /M LOG 1 dB/ REF -.75 dB 1 : - . 65550 dB 1 . 245 000 MHz CH1 S31 LOG Overall Frequency Response (10 dB/div) .1 to 10 MHz 18 Jan 2001 09:41:16 10 dB/ REF -40 dB PRm PRm Cor Cor SCALE 10 dB/div 1 START . 100 000 MHz STOP 1 . 500 000 MHz START . 100 000 MHz STOP 10 . 000 000 MHz Figure 3 Figure 4 Deviation From Linear Phase (2/div) .1 to 1.5 MHz 18 Jan 2001 09:52:40 CH1 S31 PHA 2 / REF 0 CH1 S31 /M PHA Phase Match Between Pairs (2/div) .1 to 1.5 MHz 18 Jan 2001 09:54:39 2 / REF 0 1 : 1 . 0526 . 870 000 MHz PRm Del PRm Cor SCALE 2 /div Cor SCALE 2 /div 1 START . 100 000 MHz STOP 1 . 000 000 MHz START . 100 000 MHz STOP 1 . 000 000 MHz Figure 5 Figure 6 (c) 2001, KR Electronics, Inc. Page 2 KR Electronics, Inc. www.krfilters.com KR 2388 Root Raised Cosine Filter Specifications Parameter Filter type Rolloff factor () Fs Source and load impedance Deviation from ideal Deviation from linear phase Phase match in pairs Specification Root Raised Cosine 0.35 2 MHz 50 < 1 dB to the -12 dB frequency < 2.5 to the -3 dB frequency < 2.5 to the -1 dB frequency Physical Dimensions KR Electronics, Inc. 91 Avenel Street Avenel, NJ 07001 (c) 2001, KR Electronics, Inc. Web Email Phone Fax www.krfilters.com sales@krfilters.com (732) 636-1900 (732) 636-1982 Page 3 |
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