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LM13700MX 데이터시트(PDF) 10 Page - Texas Instruments

부품명 LM13700MX
상세설명  LM13700 Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
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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
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