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LM13700 bảng dữ liệu(PDF) 13 Page - National Semiconductor (TI)

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tên linh kiện LM13700
Giải thích chi tiết về linh kiện  Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
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LM13700 bảng dữ liệu(HTML) 13 Page - National Semiconductor (TI)

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Voltage Controlled Filters (Continued)
Voltage Controlled Oscillators
The classic Triangular/Square Wave VCO of
Figure 15 is
one of a variety of Voltage Controlled Oscillators which may
be built utilizing the LM13700. With the component values
shown, this oscillator provides signals from 200 kHz to below
2HzasI
C is varied from 1 mA to 10 nA. The output ampli-
tudes are set by I
A xRA. Note that the peak differential input
voltage must be less than 5V to prevent zenering the inputs.
A few modifications to this circuit produce the ramp/pulse
VCO of
Figure 16. When V
O2 is high, IF is added to IC to in-
crease amplifier A1’s bias current and thus to increase the
charging rate of capacitor C. When V
O2 is low, IF goes to
zero and the capacitor discharge current is set by I
C.
The VC Lo-Pass Filter of
Figure 11 may be used to produce
a high-quality sinusoidal VCO. The circuit of
Figure 16 em-
ploys two LM13700 packages, with three of the amplifiers
configured as lo-pass filters and the fourth as a limiter/
inverter. The circuit oscillates at the frequency at which the
loop phase-shift is 360˚ or 180˚ for the inverter and 60˚ per
filter stage. This VCO operates from 5 Hz to 50 kHz with less
than 1% THD.
DS007981-21
FIGURE 14. Voltage Controlled State Variable Filter
www.national.com
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