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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Filters >
   Raised Cosine Low Pass Filter (RCLPF)       

Raised Cosine Low Pass Filter (RCLPF)

 

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Properties

Description

Units

Default

Range

FC

Cutoff frequency (3dB)

Hz

 

>0

E

Exponential parameter

none

0.5

(0,1]

B

Rolloff factor

none

0.5

(0,1]

R1

Reference resistance at node 1

Ohm

50.

³0

R2

Reference resistance at node 2

Ohm

50

³0

IL

Insertion loss in dB

 

0

³0

 

Notes

1. The raised cosine frequency characteristic is given by: where B is the rolloff factor, and takes values ranging from 0 to 1.

2. The bandwidth occupied by the signal beyond the cutoff frequency FC is called the excess bandwidth and is usually expressed as a percentage of the cutoff frequency. For example, when B=0.5, the excess bandwidth is 50%, and when B=1.0, the excess bandwidth is 100%.

3. The exponential parameter E raises the transfer function to the power E: HFRC(jw)=(HRC(jw))E. The default value E=0.5 is typically used in a cascade of identical transmit and receive filters.

4. At DC, the filter is implemented as a short circuit.

Netlist Form

RCLPF:NAME n1 n2 FC=val [B=val] [E=val]

Netlist Example

RCLPF:1 1 2 FC=2GHZ B=1 e=1

References

1. G. Proakis, Digital Communications, McGraw-Hill, 1989



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