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LM13600AN データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM13600AN
部品情報  Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM13600AN データシート(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 LM13600 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 ampli-
tude with a −3 dB point defined by the given equation, where
g
m is again 19.2 x IABC at room temperature. Figure 12
shows a VC High-Pass Filter which operates in much the
same manner, providing a single RC roll-off below the de-
fined 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 and the
varied bias of the buffer Darlingtons, these filters perform
well over several decades of frequency.
DS007980-14
FIGURE 7. AGC Amplifier
DS007980-15
FIGURE 8. Voltage Controlled Resistor, Single-Ended
www.national.com
10


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