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GaAs Constant Gamma Hyperabrupt Tuning Varactors
Features
q q q q q
MA46410 thru 480 Series
V3.00
Case Styles
Constant Gamma = 1.0, 1.25 or 1.5 High Q (up to 4000 at -4 Volts) Larger Capacitance Change with Voltage More Linear Frequency Tuning 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 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.
30
277
TYPICAL JUNCTION CAPACITANCE vs TUNING VOLTAGE
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 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.
PACKAGED TUNING VARACTOR EQUIVALENT CIRCUIT
TUNING VOLTAGE VR + Ø (VOLTS)
Specifications Subject to Change Without Notice.
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GaAs Constant Gamma Hyperabrupt Tuning Varactors Electrical Specifications at 25°C
MA46450 Series
Voltage6
MA46410 thru 480 Series
V3.00
Gamma = 1.0
MA46470 Series
Gamma = 1.25
Reverse = 22 Volts minimum Gamma4 = 0.9 - 1.1, VR = 2 - 20 Volts Junction Capacitance Ratio (CJ2/CJ20) = 5.0 - 8.0 Total2, 3, 5, 7 Capacitance Cases1 @ -4 Volts Style Min./Max. (pF) 30 30 30 30 30 30 30 30 0.5 0.7 1.0 1.5 1.8 2.2 3.3 4.7 Total Capacitance7 Ratio (2/20) Min./Max. 2.0-3.8 2.9-4.4 3.6-5.2 3.8-5.5 4.1-6.1 4.1-6.1 4.5-6.7 4.8-7.2 50 MHz Q at -4 VoIts Typical 4000 4000 3000 3000 3000 3000 2000 1500
Reverse Voltage6 = 22 Volts minimum Gamma4 = 1.13 - 1.38, VR = 2 - 20 Volts Junction Capacitance Ratio (CJ2/CJ20) = 8.15 - 12.99 Total2, 3, 5, 7 Capacitance @ -4 Volts Min./Max. (pF) 0.5 0.7 1.0 1.2 1.5 1.8 2.0 2.2 2.7 3.3 3.7 4.7 5.6 6.8 8.2 10.0 Total 50 MHz Capacitance7 Q at Ratio (2/20) -4 Volts Min./Max. Minimum 2.2/4.1 3.6/5.6 4.8/7.4 4.8/7.4 5.0/7.4 6.6/8.7 6.6/8.7 6.6/8.7 6.4/10.0 6.4/10.0 6.8/11.0 6.9/11.1 7.2/11.5 7.2/11.5 7.2/11.5 7.5/12.0 4000 4000 3000 3000 3000 3000 3000 3000 2000 2000 2000 1500 1500 1500 1500 1500
Model Number MA46450 MA46451 MA46452 MA46454 MA46455 MA46457 MA46459 MA46461
Model Num.