參數(shù)資料
型號(hào)： LM13700N
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
中文描述： DUAL OP-AMP, 4000 uV OFFSET-MAX, 2 MHz BAND WIDTH, PDIP16
封裝： PLASTIC, DIP-16
文件頁(yè)數(shù)： 20/24頁(yè)
文件大?。?/td> 633K
代理商： LM13700N
Additional Applications
(Continued)
The circuit of Figure 28 is a voltage reference of variable
Temperature Coefficient. The 100 k
potentiometer adjusts
the output voltage which has a positive TC above 1.2V, zero
TC at about 1.2V, and negative TC below 1.2V. This is ac-
complished by balancing the TC of the A2 transfer function
against the complementary TC of D1.
The wide dynamic range of the LM13700 allows easy control
of the output pulse width in the Pulse Width Modulator of Fig-
ure 29
For generating I
over a range of 4 to 6 decades of cur-
rent, the system of Figure 30 provides a logarithmic current
out for a linear voltage in.
Since the closed-loop configuration ensures that the input to
A2 is held equal to 0V, the output current of A1 is equal to
I
3
= V
C
/R
C
.
The differential voltage between Q1 and Q2 is attenuated by
the R1,R2 network so that A1 may be assumed to be oper-
ating within its linear range. From Equation (5) the input volt-
age to A1 is:
The voltage on the base of Q1 is then
The ratio of the Q1 and Q2 collector currents is defined by:
Combining and solving for I
ABC
yields:
This logarithmic current can be used to bias the circuit of Fig-
ure 4 to provide temperature independent stereo attenuation
characteristic.
DS007981-34
FIGURE 27. True RMS Converter
www.national.com
20
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