The MA46450, MA46470 and MA46410 series of
tuning varactors are hyperabrupt junction Gallium
Arsenide diodes featuring constant gamma 1.0
(MA46450 series),1.25 (MA46470 series) or 1.5
(MA46410 series). These diodes offer high Q (up
to 4000) permitting excellent tuning performance
from VHF through Ka band. Each part in this series
exhibits the large change in capacitance versus
bias voltage characteristic of hyperabrupt junctions.
The standard capacitance tolerance is
±10%, with tighter tolerances available. Capacitance
matching at one or more bias voltages is
also available. All diode types are available in a
wide selection of ceramic packages and in chip
form. The constant gamma value of 1.0, 1.25 or
1.5 available with these diodes enables the circuit
designer to produce significant improvements in
circuit performance. Constant gamma tuning
varactors permit more linear VCO frequency tuning
than do conventional hyperabrupt tuning varactors.
These varactors are particularly well suited for
use in voltage tuned filters, analog phase shifters,
and modulator circuits.