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參數資料
| 型號： | MAT04FSZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 小信號晶體管 |
| 英文描述： | 30 mA, 40 V, 4 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR |
| 封裝： | SO-14 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 853K |
| 代理商： | MAT04FSZ-REEL |
REV. D
MAT04
–6–
TPC 11. Collector-to-Base
Capacitance vs. Collector-to-
Base Voltage
TPC 12. Collector-to-Substrate
Capacitance vs. Collector-to-
Substrate Voltage
TPC 10. Total Noise vs.
Collector Current
APPLICATION NOTES
It is recommended that one of the substrate pins (Pins 4 and 11)
be tied to the most negative circuit potential to minimize cou-
pling between devices. Pins 4 and 11 are internally connected.
APPLICATIONS
CURRENT SOURCES
The MAT04 can be used to implement a variety of high imped-
ance current mirrors as shown in Figures 1, 2, and 3. These
current mirrors can be used as biasing elements and load de-
vices for amplifier stages.
Figure 1. Unity Gain Current Mirror, IOUT = IREF
The unity-gain current mirror of Figure 1 has an accuracy of
better than 1% and an output impedance of over 100 M
at
100
A. Figures 2 and 3 show modified current mirrors de-
signed for a current gain of two, and one-half respectively. The
accuracy of these mirrors is reduced from that of the unity-gain
source due to base current errors but is still better than 2%.
Figure 2. Current Mirror, IOUT = 2(lREF)
Figure 3. Current Mirror, IOUT = 1/2(IREF)
Figure 4 is a temperature independent current sink that has an
accuracy of better than 1% at an output current of 100
A to 1
mA. The Schottky diode acts as a clamp to ensure correct cir-
cuit start-up at power on. The resistors used in this circuit
should be 1% metal-film type.
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