J111-E3 Vishay, J111-E3 Datasheet - Page 5

• Manufacturer Part Number: J111-E3
• Description: 51K2069
• Manufacturer: Vishay

Specifications of J111-E3

• Breakdown Voltage Vbr: -55V
• Zero Gate Voltage Drain Current Idss: 20mA
• Gate-source Cutoff Voltage Vgs(off) Max: -10V
• Power Dissipation Pd: 360mW
• Operating Temperature Range: -55°C To +150°C
• No. Of Pins: 3
• Rohs Compliant: Yes

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.
Siliconix
10-Mar-97
Lowest frequency at JFET V
Upper frequency is controlled by R
Figure 10. Voltage-Tuned Filter Octave Range
V
V
V
GS
V
IN
IN
GS
–
+
Figure 12. Electronic Gain Control
VCR
R
1
GS(off)
R
1
2
and tuned by R
.
2
3
2
3
OPA
OPA
2
.
6
6
V
V
OUT
OUT
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
plied signal amplitude, while maintaining a linear resis-
tance. It is advantageous to select FETs with high V
compatible with the desired r
els are to be encountered.
A number of other FET VCR applications are shown in
Figures 10 through 15.
Video
Input
GS(off)
–V
Figure 11. Voltage Controlled Variable Gain Amplifier
The “T” attenuator provides for optimum dynamic linear range
attenuation.
will have a larger dynamic range in terms of ap-
VCR
Figure 13. VCR Phase Advance Circuit
V
IN
+
–V
GS
DS
value if large signal lev-
VCR
VCR
AN105
VCR
Video
Output
GS(off)
V
OUT
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