Материал: CA3127
CA3127
Typical Performance Curves (Continued)
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1.5 - 8pF |
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C*2 |
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VO |
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12 |
8.2 |
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SHIELD |
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kΩ |
0.47μH |
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Q5 |
14 |
1000 |
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620Ω 1000 |
This circuit was chosen because it conveniently represents |
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2 |
13 |
pF |
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pF |
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VI 1000pF 0.3μH |
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TEST |
a close approximation in performance to a properly unilat- |
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POINT |
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4 |
Q2 |
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eralized single transistor of this type. The use of Q3 in a |
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560Ω |
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current-mirror configuration facilitates simplified biasing. |
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1.8pF |
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750Ω |
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The use of the cascode circuit in no way implies that the |
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3 |
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1% |
transistors cannot be used individually. |
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C1 |
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1000 |
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OHMITE |
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pF |
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6 |
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+12V |
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Z144 |
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25kΩ |
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8 |
Q3 |
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*E.F. JOHNSON NUMBER 160-104-1 |
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1000 |
7 |
5 |
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OR EQUIVALENT |
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pF |
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FIGURE 18. 100MHz POWER-GAIN AND NOISE-FIGURE TEST CIRCUIT |
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GENERAL RADIO 1021-P1
100MHz GENERATOR
ATTN |
100MHz |
BOONTON 91C |
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TEST SET |
R.F. VOLTMETER |
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12 VOLT DC |
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POWER SUPPLY |
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(a) POWER GAIN SET-UP
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VHF NOISE SOURCE |
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100MHz |
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100MHz |
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NOISE FIGURE METER |
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HEWLETT PACKARD HP343A |
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TEST SET |
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POST AMPLIFIER |
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HEWLETT PACKARD HP342A |
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12 VOLT DC
POWER SUPPLY
15 VOLT DC
POWER SUPPLY
(b) NOISE FIGURE SET-UP
FIGURE 19. BLOCK DIAGRAMS OF POWER-GAIN AND NOISE-FIGURE TEST SET-UPS
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