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please help me

J

janz

Jan 1, 1970
0
how to design chebyshev bandpass filter and low noise amplifier for RF
application. Frequency range : 40 MHz - 400 MHz.
 
T

Tom Bruhns

Jan 1, 1970
0
See filter design software, such as what's in RFSim99 or the filter
program at www.aade.com, for help with the filter. What passband
ripple? How steep a cutoff at the band edges? Do you know how to
convert a low-pass filter to a bandpass? If so, you should be able to
work from tables in filter books. Question for you: is it better to
design it as a bandpass filter, or as a highpass and a lowpass?
Amplifier: you need to supply more specs. HOW low noise? What's the
driving source impedance? What input return loss do you need to
achieve? What gain? What TOI and SOI? What 1dB compression point?
What power supplies are available? Do you have budgets for space,
power, cost? Other constraints?

If it IS a homework assignment, you may well learn more seeking answers
to those other questions than from the original question itself.
 
E

ehsjr

Jan 1, 1970
0
janz said:
how to design chebyshev bandpass filter and low noise amplifier for RF
application. Frequency range : 40 MHz - 400 MHz.

You put a bunch of parts into a sturdy bag and shake it
real good. Then you hand the bag to the teacher who
assigned the homework.
 
F

Frank Raffaeli

Jan 1, 1970
0
janz said:
how to design chebyshev bandpass filter and low noise amplifier for RF
application. Frequency range : 40 MHz - 400 MHz.

What's the application? Why do you think you need a Chebyshev filter?

Thanks,

Frank
 
J

janz

Jan 1, 1970
0
my lect just give me the frequency range.this BPF and LNA will connect
to RF Protek 3201(spectrum analyzer). RF Protek need 12V as source. so
BPF voltage output is 12V. as general this system like this........
LPDA antenna ---- LNA ---- BPF ----- Protek 3201. thanx for your help
 
K

Ken Taylor

Jan 1, 1970
0
janz said:
my lect just give me the frequency range.this BPF and LNA will connect
to RF Protek 3201(spectrum analyzer). RF Protek need 12V as source. so
BPF voltage output is 12V. as general this system like this........
LPDA antenna ---- LNA ---- BPF ----- Protek 3201. thanx for your help

You'd better check with your lecturer again - if you stick 12V into the
Protek you risk damaging it. The LNA on the other hand is probably expecting
its 12V power to be fed up the cable to it. Go check out LNA's on
Minicircuits' site and then Google your filters.

Ken
 
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