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| 型號： | 051AC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| 中文描述： | 增強型場效應低失調(diào)運算放大器 |
| 文件頁數(shù)： | 39/68頁 |
| 文件大?。?/td> | 1336K |
| 代理商： | 051AC |
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TL05x, TL05xA
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178A – FEBRUARY 1997 - REVISED FEBRUARY 2003
44
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
high input impedance log amplifier
The low input offset voltage and high input impedance of the TL05xA creates a precision log amplifier (see
Figure 87). IC1 is a 2.5-V, low-current precision, shunt regulator. Transistors Q1 and Q2 must be a closely
matched npn pair. For best performance over temperature, R4 should be a metal-film resistor with a low
temperature coefficient.
In this circuit, U1A serves as a high-impedance unity-gain buffer. Amplifier U1B converts the input voltage to
a current through R1 and Q1. Amplifier U1C, IC1, and R4 form a 1-
A temperature-stable current source that
sets the base-emitter voltage of Q2. U1D amplifies the difference between the base-emitter voltage of Q1 and
Q2 (see Figure 88). The output voltage is given by the following equation:
V
O +
– 1
) R6
R5
kT
q
In
V
I
R1
1
10–6
where k
+ 1.38
10–23,q
+ 1.602
10–19,
and T is Kelvin temperature
_
+
_
+
U1A
_
+
U1B
_
+
U1C
U1D
VI
R1
10 k
Q1
Q2
2N2484
R2
15 V
10 k
2.5 M
R4
150 pF
C1
IC1
270 k
R3
–15V
R5
10 k
R6
10 k
VO
(see equation above)
NOTE A: U1A through U1D = TL05xA. IC1 = LM385, LT1004, or LT1009 voltage reference
Figure 87. Log Amplifier
0
1
2345
6
–
Differential
V
oltage
Amplification
–
dB
f – Frequency – Hz
78
9
10
–0.4
–0.35
–0.3
–0.25
–0.2
–0.15
–0.1
A
VD
Figure 88. Output Voltage vs Input Voltage for Log Amplifier
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