M/A-COM, Inc.

North America:

Tel. (800) 366-2266

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Asia/Pacific: Tel. +81 (03) 3226-1671

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Europe: Tel.

+44 (1344) 869 595

Fax (800) 618-8883

Fax +81 (03) 3226-1451

Fax +44 (1344) 300 020

1

Specifications Subject to Change Without Notice.

V3.00

GaAs Constant Gamma

Hyperabrupt Tuning Varactors

MA46410 thru 480 Series

Features

q

Constant Gamma = 1.0, 1.25 or 1.5

q

High Q (up to 4000 at -4 Volts)

q

Larger Capacitance Change with Voltage

q

More Linear Frequency Tuning

q

High and Nearly Constant Modulation Sensitivity

Description

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 tun-

ing 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 toler-

ances 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.

Applications

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 frequen-

cy tuning than do conventional hyperabrupt tuning varac-

tors. These varactors are particularly well suited for use in

voltage tuned filters, analog phase shifters, and modulator

circuits.

Case Styles

30

277

PACKAGED TUNING VARACTOR EQUIVALENT CIRCUIT

TYPICAL JUNCTION CAPACITANCE vs TUNING VOLTAGE

TUNING VOLTAGE V