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© 2001, KR Electronics, Inc.

KR 2388 Root Raised Cosine Filter

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.

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.

General Description

KR Electronics, Inc.

Features

Typical Performance

CH1

MEM

LOG

5 dB/

REF 0 dB

START

. 100

000

MHz

STOP

1 . 500

000

MHz

Cor

PRm

18 Jan 2001 09:47:08

CH1

S31

LOG

5 dB/

REF -.75 dB

START

. 100

000

MHz

STOP

1 . 500

000

MHz

Cor

PRm

18 Jan 2001 09:47:33

Figure 1

Figure 2

Ideal Response

(5 dB/div) 0.1 to 1.5 MHz

Actual Filter Response

(5 dB/div) 0.1 to 1.5 MHz

Figure 1 shows the ideal response, while Figures 2-6 show actual measured data from a typical filter.

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