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LM13600 Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM13600
Descripción Electrónicos  Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
PDF  24 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM13600 Datasheet(HTML) 18 Page - National Semiconductor (TI)

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Additional Applications (Continued)
into capacitor C whenever the input to A1 is brought high,
giving a ramp-rate of about 1 V/ms for the component values
shown.
The true-RMS converter of
Figure 27 is essentially an auto-
matic gain control amplifier which adjusts its gain such that
the AC power at the output of amplifier A1 is constant. The
output power of amplifier A1 is monitored by squaring ampli-
fier A2 and the average compared to a reference voltage
with amplifier A3. The output of A3 provides bias current to
the diodes of A1 to attenuate the input signal. Because the
output power of A1 is held constant, the RMS value is con-
stant and the attentuation is directly proportional to the RMS
value of the input voltage. The attenuation is also propor-
tional to the diode bias current. Amplifier A4 adjusts the ratio
of currents through the diodes to be equal and therefore the
voltage at the output of A4 is proportional to the RMS value
of the input voltage. The calibration potentiometer is set such
that V
O reads directly in RMS volts.
DS007980-32
FIGURE 25. Sample-Hold Circuit
DS007980-33
FIGURE 26. Ramp and Hold
DS007980-34
FIGURE 27. True RMS Converter
www.national.com
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