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參數(shù)資料
| 型號： | TL054AMFK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | JT 28C 26#20 2#16 SKT WALL REC |
| 中文描述： | 增強型場效應(yīng)低失調(diào)運算放大器 |
| 文件頁數(shù)： | 61/65頁 |
| 文件大?。?/td> | 1022K |
| 代理商： | TL054AMFK |
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TL05x, TL05xA, TL05xY
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178 – FEBRUARY 1997
61
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
voltage-ratio-to-dB converter
The application in Figure 90 measures the amplitude ratio of two signals and then converts the ratio to decibels
(see Figure 91). The output voltage provides a resolution of 100 mV/dB. The two inputs can be either dc or
sinusoidal ac signals. When using ac signals, both signals should be the same frequency or output glitches will
occur. For measuring two input signals of different frequencies, extra filtering should be added after the
rectifiers.
The circuit contains three low-offset TL05xA devices. Two of these devices provide the rectification and
logarithmic conversion of the inputs. The third TL05xA forms an instrumentation amplifier. The stage performing
the logarithmic conversion also requires two well-matched npn transistors.
The input signal first passes through a high impedance unity-gain buffer U1A (U2A). Then U1B (U2B) rectifies
the input signal at a gain of 0.5, and U1C (U2C) provides a noninverting gain of 2 so that the system gain is still
one. U1D (U2D), R6 (R13), and Q1 (Q2) perform the logarithmic conversion of the rectified input signal. The
instrumentation amplifier formed by U3A, U3B, U3D scales the difference of the two logarithmic voltages by a
gain of 33.6. As a result, the output voltage equals 100 mV/dB. The 1-k
potentiometer on the input of U3C
calibrates the zero dB reference level. The following equations are used to derive the relationship between the
input voltage ratio expressed in decibels and the output voltage.
X dB
20 log
VA
VB
20
In VA
– VB
In (10)
X dB
8.686 In VA
– In VB
VBE(Q1)
kT
q
In
VA
R
IS
VBE(Q2)
kT
q
In
VB
R
IS
VBE
VBE(Q1)–VBE(Q2)
kT
q
In VA
– In VB
X dB
8.686
kT q
VBE(Q1)–VBE(Q2)
336
VBE(Q1)–VBE(Q2)
at 25
°
C
where
k
1.38
10–23, q
1.602
10–19, and T is in kelvins.
This would give a resolution of 1 V/dB. Therefore, the gain of the instrumentation amplifier is set at 33.6 to obtain
100 mV/dB.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TL054MFK | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL051AMJG | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL051AMP | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL051MD | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL051MFK | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TL054AMFKB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL054AMJ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL054AMJB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TL054AMN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| TL054C | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
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