Chemicals
Based Technologies - Silicon Hyperabrupt Varactor
Diode
Introduction
Indian R&D organization offers
technology of silicon hyperabrupt varactor diode. This
is a variable reactor or a variable capacitance diode
of the reverse-biased PN junction. It is employed in
tuning operations by varying the voltage at the junction
capacitance. It is used in tuning elements and frequency
multiplication.
Applications in tuning: suitable for
1:1 replacement for tuningin electronic tuners (colour
TV) or applications in telecommunications and electronics
in frequency range of 54-850 MHz. This is a state-of-art
technology for the manufacture of silicon hyperabrupt
varacter diodes, which would be most suitable for existing
diode manufacturers. The process involved in the manufacture
of varactor diodes employs an epitaxial growth technique
that uses substrate doping profiles. The variation of
junction capacitance to reverse bias voltage and the
doping profiles are specific to each application.
The process involves only three thermal steps, two masks,
two implantations (or one implantation and one boron
diffusion - BN source) and one metallization to accomplish
fabrication of the diodes. Thus the process steps have
been reduced drastically to ease manufacturing of this
double diffused device structure.
Plant and machinery
Diffusion furnace, Ion implanter, Mask aligner, Metallisation
unit, Probing machine, Dicing machine, Oven, Spinner,
Plastic packaging unit, D.I.Water plant
Areas of application: Electronics
industry
Production capacity
60 Million Nos.
No. of Shifts: 1/day
Working days: 300/Yr.
Inputs required
Area:
Land area: 200 sq.m.
Covered area: 125 sq.m.
Manpower: 6 total, including 1 Managerial, 4 Skilled
and 4
Unskilled
Raw Materials (Per Million Nos. of Product):
Silicon Wafer: 1.25 Nos; Chemicals: INR 0.01375
Utilities (Per Million Nos. of Product):
Power: 125 KwH; Water: 2800 kL
Economic data
Plant & Machinery: INR 42 million
Know-how fees: INR 0.5 million
Recurring Royalty: 3 % on sales
Period of Licence: 10 yrs
Transfer forms
Know-how, equipment, turnkey plant, licensing
For More Information
Asian and Pacific Centre for Transfer
of Technology,
APCTT Building,
C-2 Qutab Institutional Area,
P.O.Box - 4575
New Delhi - 110 016
India
