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LM13700MX 데이터시트(PDF) 10 Page - Texas Instruments |
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LM13700MX 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 32 page LM13700 SNOSBW2E – NOVEMBER 1999 – REVISED MARCH 2013 www.ti.com APPLICATIONS Voltage Controlled Amplifiers Figure 23 shows how the linearizing diodes can be used in a voltage-controlled amplifier. To understand the input biasing, it is best to consider the 13 k Ω resistor as a current source and use a Thevenin equivalent circuit as shown in Figure 24. This circuit is similar to Figure 22 and operates the same. The potentiometer in Figure 23 is adjusted to minimize the effects of the control signal at the output. Figure 22. Linearizing Diodes For optimum signal-to-noise performance, IABC should be as large as possible as shown by the Output Voltage vs. Amplifier Bias Current graph. Larger amplitudes of input signal also improve the S/N ratio. The linearizing diodes help here by allowing larger input signals for the same output distortion as shown by the Distortion vs. Differential Input Voltage graph. S/N may be optimized by adjusting the magnitude of the input signal via RIN (Figure 23) until the output distortion is below some desired level. The output voltage swing can then be set at any level by selecting RL. Although the noise contribution of the linearizing diodes is negligible relative to the contribution of the amplifier's internal transistors, ID should be as large as possible. This minimizes the dynamic junction resistance of the diodes (re) and maximizes their linearizing action when balanced against RIN. A value of 1 mA is recommended for ID unless the specific application demands otherwise. Figure 23. Voltage Controlled Amplifier 10 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM13700 |
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