2388 Datasheet, PDF (1/3 Pages) KR Electronics, Inc. – Root Raised Cosine Filter

KR 2388 Root Raised Cosine Filter
KR Electronics, Inc.
www.krfilters.com
General Description
KR Electronics designs and manufactures filters that approxi-
mate the raised cosine response. These filters are available as
both the cosine response and the root cosine response. Sym-
bol rates to 75 MHz have been designed. They are also avail-
able with and without sin(x)/x compensation. Various roll off
factors alpha (α) are also available. Typical values for α fall
in the 0.3 to 0.5 range.
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 α=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.
CH1 MEM
LOG
PRm
Cor
Ideal Response
(5 dB/div) 0.1 to 1.5 MHz
5 dB/
REF 0 dB
18 Jan 2001 09:47:08
CH1 S31
LOG
Actual Filter Response
(5 dB/div) 0.1 to 1.5 MHz
5 dB/
REF -.75 dB
18 Jan 2001 09:47:33
PRm
Cor
START
. 100 000 MHz
Figure 1
STOP
1 . 500 000 MHz
© 2001, KR Electronics, Inc.
START
. 100 000 MHz
Figure 2
STOP
1 . 500 000 MHz
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