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參數(shù)資料
| 型號： | LM13700 |
| 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)： | 9/24頁 |
| 文件大?。?/td> | 633K |
| 代理商： | LM13700 |
Stereo Volume Control
(Continued)
Noting that the gain of the LM13700 amplifier of Figure 3
may be controlled by varying the linearizing diode current I
D
as well as by varying I
, Figure 7 shows an AGC Amplifier
using this approach.As V
reaches a high enough amplitude
(3V
) to turn on the Darlington transistors and the lineariz-
ing diodes, the increase in I
D
reduces the amplifier gain so
as to hold V
O
at that level.
Voltage Controlled Resistors
An Operational Transconductance Amplifier (OTA) may be
used to implement a Voltage Controlled Resistor as shown in
Figure 8 A signal voltage applied at R
generates a V
to
the LM13700 which is then multiplied by the g
m
of the ampli-
fier to produce an output current, thus:
where g
≈
19.2I
at 25C. Note that the attenuation of V
O
by R and R
is necessary to maintain V
IN
within the linear
range of the LM13700 input.
Figure 9 shows a similar VCR where the linearizing diodes
are added, essentially improving the noise performance of
the resistor. A floating VCR is shown in Figure 10 where
each “end” of the “resistor” may be at any voltage within the
output voltage range of the LM13700.
DS007981-13
FIGURE 6. Four-Quadrant Multiplier
DS007981-14
FIGURE 7. AGC Amplifier
www.national.com
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM13700AN | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13700M | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM13700N | Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers |
| LM1391 | LM1391 Phase-Locked Loop |
| LM1391N | LM1391 Phase-Locked Loop |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM13700A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM13700AN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM13700AN/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transconductance Operational Amplifier |
| LM13700AN/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transconductance Operational Amplifier |
| LM13700M | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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