FREQUENCY LINEAR TUNING VARACTORS
DESCRIPTION
A Frequency Linear Tuning Varactor (FLTVAR)
TM
is a sili-
con epitaxial mesa device, designed to provide wide-
band Linear Tuning in VCO and filter applications.
These diodes feature thermal oxide passivation for high
reliability, low leakage current, and very low surface
noise. They offer Q values well above ion-implanted
hyperabrupt diodes.
The specifications below apply to chips, or to chips
mounted on carriers. Although these chips can be pro-
vided in any of our standard packages, this is not recom-
mended for the lower capacitance diodes, because the
parallel parasitic capacitance of the package degrades
linearity at high bias voltages.
APPLICATIONS
The GC15000 series of frequency-linear tuning varactors
are used in VCO's, filters, amplifiers and modulators for
wide band tuning through Ku band. The frequency linear
characteristics allow over one octave linear tuning in
suitable circuits, with no need for external linearization.
The combination of high Q and low surface noise results
in low FM noise in VCO applications. They are particu-
larly useful in modulated VCO's because of their con-
stant sensitivity, and high modulation rate capability.
ELECTRICAL SPECIFICATIONS: T
A
=25
C
MODEL
NUMBER
JUNCTIO
N
1
CAPACIT
ANCE
C
J-4
(pF)
SENSITIV
ITY
2
TYP
QUALITY
FACTOR
3
TYP
TUNING
RATION
4
C
J
0 / C
J
V
TYP
GC15001
0.7
.08
1500
6:1
GC15002
1.0
.08
1450
6:1
GC15003
2.0
.08
1400
6:1
GC15004
5.0
.08
1300
6:1
GC15005
10.0
.08
900
6:1
GC15014
22.0
.08
600
6:1
GC15015
33.0
.08
475
6:1
GC15016
48.0
.08
400
6:1
GC15006
0.7
.11
900
11:1
GC15007
1.0
.11
875
11:1
GC15008
2.0
.11
850
11:1
GC15009
5.0
.11
825
11:1
GC15010
10.0
.11
800
11:1
GC15011
22.0
.11
600
11:1
GC15012
33.0
.11
475
11:1
GC15013
48.0
.11
400
11:1
NOTES:
1. Other capacitance values are available; consult factory.
2. Other S values and tuning ranges can be developed.
3. V=4 V, 50 MHz
4. Sensitivity series, S = .08; V = 15 volts.
Sensitivity series, S = . 11; V = 20 volts.
RATINGS
Minimum Voltage Breakdown:
22 volts at 10A max
Maximum Leakage Current:
50 nA at 20 volts, 25C
Capacitance Tolerance:
10% at -4 volts
1
Operating Temperature:
-55C to +150C
Storage Temperature:
-65C to +200C
SEMICONDUCTOR OPERATION
75 Technology Drive Lowell, MA 01851 Tel: 978-442-5600 Fax: 978-937-3748
35
Typical Performance
Tuning Varactors
TOC
FREQUENCY LINEAR TUNING VARACTORS
Typical Capacitance vs Reverse Voltage
Frequency vs Reverse Voltage
in Single Stage L-C Circuit
SEMICONDUCTOR OPERATION
75 Technology Drive Lowell, MA 01851 Tel: 978-442-5600 Fax: 978-937-3748
36
Tuning Varactors
TOC
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