NJM2275 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM2275 Datasheet PDF : 5 Pages
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NJM2275
TEST CIRCUIT
This test circuit allows the measurement of all parameters described in “ELECTRICAL CHARACTERISTICS”.
Test Circuit 1 : PG , lS11l2 , lS22l2 , P–1dB , Output Level versus Input Level
L in C in
27n 1000p
1
SG
(50Ω)
2
Cb
1000p
3
V+
6
Cv
1000p
5
CL
2p
4
Lout Cout
15n 8p
Spectrum
Analyzer
(Zin=50Ω)
Test Circuit 2 : VG , Output Level versus Input Level
L in C in
27n 1000p
1
SG
(50Ω)
2
Cb
1000p
3
V+
6
Cv
1000p
5
CL
RL
2p 1kΩ
4
Lout Cout
27n 4p
Spectrum
Analyzer
(Zin=50Ω)
Test Circuit 3 : Power Gain versus Input signal Frequency
L in C in
27n 1000p
1
6
2
5
Cb
1000p
3
4
V+
Cv
1000p
CL
2p
Lout Cout
15n 8p
NF
m eter
PG and PG shown in “Output level versus Input Level” are given by ,
PG = Pout – Pin
VG = (Pout + Prl ) – Pin
Prl is caused by the voltage drop of RL. RL is 1000 Ω. The input impedance of spectrum analyzer Zin is 50Ω.
Prl is calculated from
Prl = 20log ( ( RL + Zin) / RL)
Prl = 20 log (1050 / 50 )
Ver.2004-08-25
-3-
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