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| 型號： | PRISM1KIT-EVAL |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 21/21頁 |
| 文件大小： | 140K |
| 代理商： | PRISM1KIT-EVAL |
21
It is desired that the second limiter to be fully limited on front
end noise, as opposed to noise generated in the first limiter.
This requires that the front end noise floor must be greater
than the sum of the following; the limiter NF of 7dB, the ratio
of limiter BPF noise bandwidth to front end IF SAW
bandwidth (10log(100MHz/20MHz) or 7dB), and the amount
of limiting margin (6dB for -1dB limiting). The front end
output noise floor must therefore be greater than 20dB.
The limiting margin was measured on the HFA3724 IF
Mod/Demod, with good agreement to a theoretical estimate
based upon the hyperbolic tangent response of a bipolar
differential limiter. The measurement means that if a non-
desired jamming signal, noise in this case, is 6dB below the
level of the desired signal, the desired output will be
reduced 1dB.
The front end noise floor was previously calculated for a
20MHz bandwidth as -101dBm, if the required gain is now
added, this noise floor becomes -81dBm as shown in
Equation 7. Now verify that this level is larger than the
minimum signal power required to limit the limiter chain and
guarantee that the radio limits on front end noise
(-81dBm > -98dBm).
Where;
(20MHz kTB) is Available Thermal Noise
NF
LIM
is Noise Figure of Limiter Chain
BPF
Noise
is Added Noise due to Limiter BPF Bandwidth
wider than Front End
Lim
Margin
is Front End Margin required to guarantee limiter
jammer rejection
The actual front end gain is 13.4dB and NF is 7.7dB for a
front end output noise floor increase of 21.1dB typical, which
is better than desired 20dB. This results in limiting, when no
signal is present, on mainly front end noise, but also some
limiter broadband noise. This limiter output, although still
fully limited, when band filtered will have a slight drop in
baseband quadrature output voltage to the HFA3824A ADCs
as compared to totally limiting on front end noise due to
some of the limiter noise being out of band. The net impact
to the system is a small reduction in sensitivity due to
reduced ADC signal to full scale. If desired, additional front
end gain, or a reduced bandwidth limiter BPF could be used
to gain back performance.
References
For Intersil documents available on the internet, see web site
http://www.intersil.com/
Intersil AnswerFAX (407) 724-7800.
[1] Application Note, AMD, “Wireless LAN DSSS PC Card
Reference Design” Publication Number 20575, Rev A.
[2] http://www.intersil.com/
[3] HFA3824AData Sheet, Intersil Corporation
Semiconductor, AnswerFAX Doc. No. 4064.
[4] HFA3925Data Sheet, Intersil Corporation, AnswerFAX
Doc. No. 4132.
[5] HFA3424Data Sheet, Intersil Corporation, AnswerFAX
Doc. No. 4131.
[6] HFA3624Data Sheet, Intersil Corporation, AnswerFAX
Doc. No. 4066.
[7] HFA3724Data Sheet, Intersil Corporation, AnswerFAX
Doc. No. 4067.
[8] ICL7660SData Sheet, Intersil Corporation, AnswerFAX
Doc. No. 3179.
[9] RF1K49093Data Sheet, Intersil Corporation,
AnswerFAX Doc. No. 3969.
[10] HFA3524AData Sheet, Intersil Corporation,
AnswerFAX Doc. No. 4062.
[11] “Integrating RF and Digital Circuits in a PC Card
Environment” Portable Design, May 1996.
i.e.
–
(EQ. 7)
20MHz kTB
(
+ Lim
M
)
=
NF
LIM
Front End Noise
BPF
Noise
+
+
in
arg
101dBm
7dB
7dB
6dB
81dBm
–
=
+
+
+
Application Note 9624
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