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參數(shù)資料
| 型號(hào)： | AN105 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | FETS AS VOLTAGE-CONTROLLED RESISTORS |
| 中文描述： | 場效應(yīng)管的電壓，控制電阻 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 106K |
| 代理商： | AN105 |
AN105
Siliconix
10-Mar-97
5
Distortion resulting from changes in temperature is also
minimized by the feedback resistor technique. On-resis-
tance will change with temperature in an inverse manner
to the behavior of FET drain current. Table 1 presents the
result of VCR laboratory performance tests of distortion
versus temperature. The VCR7N again was employed.
Signal level was 2 V peak-to-peak.
Summary
This application note has presented a brief description of the
use of junction field-effect transistors as voltage-controlled
resistors, including details of operation, characteristics, li-
mitations, and applications. The VCR is capable of opera-
tion as a symmetrical resistor with no dc bias voltage in the
signal loop, an ideal characteristic for many applications.
Where large signal-handling capability and minimum
distortion are system requirements, the feedback neutral-
ization technique for VCRs is an important tool in achiev-
ing either or both ends.
It has also been shown that FETs with high pinch-off volt-
age require larger drain-to-source voltages to produce
drain current saturation. Therefore, FETs with high
V
GS(off)
will have a larger dynamic range in terms of ap-
plied signal amplitude, while maintaining a linear resis-
tance. It is advantageous to select FETs with high V
GS(off)
compatible with the desired r
DS
value if large signal lev-
els are to be encountered.
A number of other FET VCR applications are shown in
Figures 10 through 15.
V
OUT
V
IN
VCR
V
GS
R
1
R
2
OPA
2
3
6
V
OUT
V
IN
V
GS
OPA
2
3
6
+
–
V
OUT
V
IN
–V
GS
VCR
+
Figure 10.
Voltage-Tuned Filter Octave Range
Figure 11.
Voltage Controlled Variable Gain Amplifier
Figure 12.
Electronic Gain Control
Figure 13.
VCR Phase Advance Circuit
Lowest frequency at JFET V
GS(off)
and tuned by R
2
.
Upper frequency is controlled by R
1
.
VCR
Video
Input
Video
Output
VCR
VCR
–V
The “T” attenuator provides for optimum dynamic linear range
attenuation.
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