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LM13600AN データシート(PDF) 10 Page - National Semiconductor (TI) |
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LM13600AN データシート(HTML) 10 Page - National Semiconductor (TI) |
10 / 24 page Voltage Controlled Resistors (Continued) Voltage Controlled Filters OTA’s are extremely useful for implementing voltage con- trolled filters, with the LM13600 having the advantage that the required buffers are included on the I.C. The VC Lo-Pass Filter of Figure 11 performs as a unity-gain buffer amplifier at frequencies below cut-off, with the cut-off frequency being the point at which X C/gm equals the closed-loop gain of (R/R A). At frequencies above cut-off the circuit provides a single RC roll-off (6 dB per octave) of the input signal ampli- tude with a −3 dB point defined by the given equation, where g m is again 19.2 x IABC at room temperature. Figure 12 shows a VC High-Pass Filter which operates in much the same manner, providing a single RC roll-off below the de- fined cut-off frequency. Additional amplifiers may be used to implement higher order filters as demonstrated by the two-pole Butterworth Lo-Pass Filter of Figure 13 and the state variable filter of Figure 14. Due to the excellent g m tracking of the two amplifiers and the varied bias of the buffer Darlingtons, these filters perform well over several decades of frequency. DS007980-14 FIGURE 7. AGC Amplifier DS007980-15 FIGURE 8. Voltage Controlled Resistor, Single-Ended www.national.com 10 |
同様の部品番号 - LM13600AN |
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同様の説明 - LM13600AN |
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