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LM13700N Arkusz danych(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM13700N
Szczegółowy opis  Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
Download  24 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM13700N Arkusz danych(HTML) 9 Page - National Semiconductor (TI)

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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
ABC, Figure 7 shows an AGC Amplifier
using this approach. As V
O reaches a high enough amplitude
(3V
BE) 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
X generates a VIN to
the LM13700 which is then multiplied by the g
m of the ampli-
fier to produce an output current, thus:
where g
m ≈ 19.2IABC at 25˚C. Note that the attenuation of VO
by R and R
A is necessary to maintain VIN 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


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