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LM13600M Folha de dados(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM13600M
Descrição Electrónicos  Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM13600M Folha de dados(HTML) 9 Page - National Semiconductor (TI)

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Stereo Volume Control (Continued)
The constant term in the above equation may be cancelled
by feeding I
S xIDRC/2 (V
+ 1.4V) into I
O. The circuit of Fig-
ure 6 adds R
M
to provide this current, resulting in a
four-quadrant multiplier where R
C is trimmed such that VO =
0V for V
IN2 = 0V. RM also serves as the load resistor for IO.
Noting that the gain of the LM13600 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
(3 V
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 LM13600 which is then multiplied by the g
m of the ampli-
fier to produce an output current, thus:
where g
m ≈ 19.2 IABC at 25˚C. Note that the attenuation of
V
O by R and RA is necessary to maintain VIN within the linear
range of the LM13600 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 LM13600.
DS007980-12
FIGURE 5. Amplitude Modulator
DS007980-13
FIGURE 6. Four-Quadrant Multiplier
www.national.com
9


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