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參數資料
| 型號： | AN105 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | FETS AS VOLTAGE-CONTROLLED RESISTORS |
| 中文描述： | 場效應管的電壓，控制電阻 |
| 文件頁數： | 4/7頁 |
| 文件大?。?/td> | 106K |
| 代理商： | AN105 |
AN105
4
Siliconix
10-Mar-97
Experimental Results
Figures 8 and 9 show low voltage output characteristic
curves for a typical Siliconix n-channel voltage-controlled
resistor, VCR7N. Bias conditions are shown both with and
without feedback. Figure 8 shows a two-volt peak-to-peak
signal on the V
GS
= 0 V bias curve, with the VCR operating
in the first and third quadrants. The VCR is operated without
feedback.
The forward-biased gate-drain PN junction may be seen
at approximately –0.6 V, and bending of the bias curve is
apparent in the third quadrant. The photo also demon-
strates the comparison between a fixed resistor (the linear
line superimposed on the bias curve) and the distortion
apparent in the VCR without feedback compensation; the
VCR signal is unusable with the indicated amount of dis-
tortion at 2 V peak-to-peak.
In Figure 9, the same VCR7N FET is shown operating
with the addition of the feedback resistors. Distortion has
been reduced to less than 0.5%, and the characteristics of
the VCR are now closely comparable to those of a fixed
resistor.
In Figures 8 and 9, the same VCR FET characteristics are
shown, with V
GS
adjusted for higher r
DS
. No feedback
network is employed in Figure 8, and measured distortion
is greater than 8%. In Figure 9, the feedback resistors
have been added and distortion has been reduced to less
than 0.5%.
Some degree of non-linearity will be experienced in both
the first and third quadrants as V
GS
approaches the FET
cut-off voltage. For this reason, it is important that the
feedback resistors be of equal value so that the non-linear-
ities likewise will be equal in both quadrants.
200
100
0
–100
–200
–1.0
0
1.0
V
GS
= V
CONTROL
V
GS
= 0 V
V
GS
= –2.5 V
200
100
0
–100
–200
–1.0
0
1.0
V
GS
= V
CONTROL
= 0 V
V
GS
= –3 V
V
CONTROL
= –6 V
Figure 8.
VCR7N Without Feedback
Figure 9.
VCR7N With Feedback.
–
I
D
A
–
I
D
A
V
DS
– Drain-Source Voltage (V)
V
DS
– Drain-Source Voltage (V)
–0.4
0.4
–0.4
0.4
Table 1:
Distortion vs. Temperature
Temperature
( C)
Without Feedback
With Feedback
r
DS
= r
DS(on)
r
DS
= 10 r
DS(on)
r
DS
= r
DS(on)
r
DS
= 10 r
DS(on)
+125
>13%
>6%
<0.5%
<0.5%
+25
>10%
>5%
<0.5%
<0.5%
–55
3.9%
3.2%
<0.5%
<0.5%
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