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參數(shù)資料
| 型號： | LM13600 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| 中文描述： | 雙路運(yùn)算跨導(dǎo)放大器的線性化二極管和緩沖器 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 634K |
| 代理商： | LM13600 |
Additional Applications
(Continued)
The circuit of Figure 28 is a voltage reference of variable
temperature coefficient. The 100 k
potentiometer adjusts
the output voltage which has a positive TC above 1.2V, zero
TC at about 1.2V and negative TC below 1.2V. This is ac-
complished by balancing the TC of the A2 transfer function
against the complementary TC of D1.
The log amplifier of Figure 29 responds to the ratio of cur-
rents through buffer transistors Q3 and Q4. Zero tempera-
ture dependence for V
is ensured because the TC of the
A2 transfer function is equal and opposite to the TC of the
logging transistors Q3 and Q4.
The wide dynamic range of the LM13600 allows easy control
of the output pulse width in the Pulse Width Modulator of Fig-
ure 30
For generating I
over a range of 4 to 6 decades of cur-
rent, the system of Figure 31 provides a logarithmic current
out for a linear voltage in.
Since the closed-loop configuration ensures that the input to
A2 is held equal to 0V, the output current of A1 is equal
to I
3
= V
C
/R
C
.
The differential voltage between Q1 and Q2 is attenuated by
the R1, R2 network so that A1 may be assumed to be oper-
ating within its linear range. From Equation (5) the input volt-
age to A1 is:
The voltage on the base of Q1 is then
The ratio of the Q1 and Q2 collector currents is defined by:
Combining and solving for I
ABC
yields:
This logarithmic current can be used to bias the circuit of Fig-
ure 4 provide a temperature independent stereo attenuation
characteristic.
DS007980-35
FIGURE 28. Delta VBE Reference
www.national.com
19
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM13600AN | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13600M | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13600N | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13700 | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13700AN | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM13600AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13600AN/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transconductance Operational Amplifier |
| LM13600M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13600MX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM13600N | 制造商:Texas Instruments 功能描述: |
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