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LM13600M Folha de dados(PDF) 9 Page - National Semiconductor (TI) |
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LM13600M Folha de dados(HTML) 9 Page - National Semiconductor (TI) |
9 / 24 page Stereo Volume Control (Continued) The constant term in the above equation may be cancelled by feeding I S xIDRC/2 (V − + 1.4V) into I O. The circuit of Fig- ure 6 adds R M to provide this current, resulting in a four-quadrant multiplier where R C is trimmed such that VO = 0V for V IN2 = 0V. RM also serves as the load resistor for IO. Noting that the gain of the LM13600 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 (3 V 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 LM13600 which is then multiplied by the g m of the ampli- fier to produce an output current, thus: where g m ≈ 19.2 IABC at 25˚C. Note that the attenuation of V O by R and RA is necessary to maintain VIN within the linear range of the LM13600 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 LM13600. DS007980-12 FIGURE 5. Amplitude Modulator DS007980-13 FIGURE 6. Four-Quadrant Multiplier www.national.com 9 |
Nº de peça semelhante - LM13600M |
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Descrição semelhante - LM13600M |
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