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參數(shù)資料
| 型號： | LM13600 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| 中文描述： | 雙路運算跨導(dǎo)放大器的線性化二極管和緩沖器 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 634K |
| 代理商： | LM13600 |
Circuit Description
The differential transistor pair Q
and Q
form a transcon-
ductance stage in that the ratio of their collector currents is
defined by the differential input voltage according to the
transfer function:
(1)
where V
is the differential input voltage, kT/q is approxi-
mately 26 mV at 25C and I
and I
are the collector currents
of transistors Q
and Q
respectively. With the exception of
Q
and Q
, all transistors and diodes are identical in size.
Transistors Q
and Q
with Diode D
form a current mirror
which forces the sum of currents I
4
and I
5
to equal I
ABC
;
I
4
+ I
5
= I
ABC
where I
ABC
is the amplifier bias current applied to the gain
pin.
For small differential input voltages the ratio of I
and I
ap-
proaches unity and the Taylor series of the In function can be
approximated as:
(2)
(3)
(4)
Collector currents I
and I
are not very useful by themselves
and it is necessary to subtract one current from the other.
The remaining transistors and diodes form three current mir-
rors that produce an output current equal to I
5
minus I
4
thus:
(5)
The term in brackets is then the transconductance of the am-
plifier and is proportional to I
ABC
.
Linearizing Diodes
For differential voltages greater than a few millivolts, Equa-
tion (3) becomes less valid and the transconductance be-
comes increasingly nonlinear. Figure 1 demonstrates how
the internal diodes can linearize the transfer function of the
amplifier. For convenience assume the diodes are biased
with current sources and the input signal is in the form of cur-
rent I
S
. Since the sum of I
4
and I
is I
and the difference
is I
OUT
, currents I
4
and I
5
can be written as follows:
Since the diodes and the input transistors have identical ge-
ometries and are subject to similar voltages and tempera-
tures, the following is true:
(6)
DS007980-8
FIGURE 1. Linearizing Diodes
www.national.com
6
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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