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LM13700 Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM13700
Descripción Electrónicos  Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
Download  24 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM13700 Datasheet(HTML) 10 Page - National Semiconductor (TI)

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Voltage Controlled Resistors (Continued)
Voltage Controlled Filters
OTA’s are extremely useful for implementing voltage con-
trolled filters, with the LM13700 having the advantage that
the required buffers are included on the I.C. The VC Lo-Pass
Filter of
Figure 11 performs as a unity-gain buffer amplifier at
frequencies below cut-off, with the cut-off frequency being
the point at which X
C/gm equals the closed-loop gain of (R/
R
A). At frequencies above cut-off the circuit provides a single
RC roll-off (6 dB per octave) of the input signal amplitude
with a −3 dB point defined by the given equation, where g
m
is again 19.2 x I
ABC at room temperature. Figure 12 shows a
VC High-Pass Filter which operates in much the same man-
ner, providing a single RC roll-off below the defined cut-off
frequency.
Additional amplifiers may be used to implement higher order
filters as demonstrated by the two-pole Butterworth Lo-Pass
Filter of
Figure 13 and the state variable filter of Figure 14.
Due to the excellent g
m tracking of the two amplifiers, these
filters perform well over several decades of frequency.
DS007981-15
FIGURE 8. Voltage Controlled Resistor, Single-Ended
DS007981-16
FIGURE 9. Voltage Controlled Resistor with Linearizing Diodes
www.national.com
10


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