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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM13600 датащи(PDF) 13 Page - National Semiconductor (TI) |
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LM13600 датащи(HTML) 13 Page - National Semiconductor (TI) |
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13 / 24 page  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 LM13600. 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 LM13600 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. DS007980-21 FIGURE 14. Voltage Controlled State Variable Filter www.national.com 13 |
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