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LM13700N Arkusz danych(PDF) 9 Page - National Semiconductor (TI) |
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LM13700N Arkusz danych(HTML) 9 Page - National Semiconductor (TI) |
9 / 24 page Stereo Volume Control (Continued) Noting that the gain of the LM13700 amplifier of Figure 3 may be controlled by varying the linearizing diode current I D as well as by varying I ABC, Figure 7 shows an AGC Amplifier using this approach. As V O reaches a high enough amplitude (3V BE) to turn on the Darlington transistors and the lineariz- ing diodes, the increase in I D reduces the amplifier gain so as to hold V O at that level. Voltage Controlled Resistors An Operational Transconductance Amplifier (OTA) may be used to implement a Voltage Controlled Resistor as shown in Figure 8. A signal voltage applied at R X generates a VIN to the LM13700 which is then multiplied by the g m of the ampli- fier to produce an output current, thus: where g m ≈ 19.2IABC at 25˚C. Note that the attenuation of VO by R and R A is necessary to maintain VIN within the linear range of the LM13700 input. Figure 9 shows a similar VCR where the linearizing diodes are added, essentially improving the noise performance of the resistor. A floating VCR is shown in Figure 10, where each “end” of the “resistor” may be at any voltage within the output voltage range of the LM13700. DS007981-13 FIGURE 6. Four-Quadrant Multiplier DS007981-14 FIGURE 7. AGC Amplifier www.national.com 9 |
Podobny numer części - LM13700N |
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Podobny opis - LM13700N |
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