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ZABG4002

Document number: DS32047 Rev. 2 - 2

1 of 7

www.diodes.com

February 2010

NEW PRODUCT

Product Line o

Diodes Incorporated

LOW POWER 4 STAGE FET LNA BIAS CONTROLLER

Summary

The ZABG4002 is a four stage depletion mode FET bias controller intended primarily for satellite Low Noise Block’s (LNB’s), but

its also suitable for other LNA applications such as those in found in PMR’s and microwave links. The ZABG4002 provides each

FET with an independent protected negative gate voltage and positive drain voltage with user programmable drain current.

Combining an advanced IC process and packaging techniques, the ZABG4002 helps minimise power consumption, component

cost and PCB area whilst enhancing overall reliability.

Features

• Four stage FET bias controller

• Operating range of 3.0V to 8.0V

• Low quiescent supply current, 1.2mA typical

• FET drain voltages set at 2.0V

• FET drain current selectable from 0 to 15mA

• Switchable FETs for power management

• Allows first and second stage FETs to be run at different

(optimum) drain currents

• FET drain voltages and currents held stable over

temperature and Vcc variations

• FETs protected against overstress during power-up and

power-down.

• Internal negative supply generator allowing single supply

operation (available for external use)

• Low external component count

Pin Assignments

Applications

• Twin LNB’s

• Quad LNB’s

• US LNB’s

• Microwave links

• PMR and Cellular telephone systems

Single Universal LNB System Diagram

Horizontal

ZXHF

5002

ZABG

6002

ZXHF

5002

ZABG

4002

Vertical

Gain stages

GaAs FET’s

Down

Converter

IF Switching, gain

and control

Horizontal

ZXHF

5002

ZABG

6002

ZXHF

5002

ZABG

4002

Vertical

Gain stages

GaAs FET’s

Down

Converter

IF Switching, gain

and control

Top View

Bottom View

SUB

GND

G3D2

CAL1

SUB

CAL2

NB2

NB1

Summary of content (7 pages)

PAGE 1
A Product Line of Diodes Incorporated ZABG4002 LOW POWER 4 STAGE FET LNA BIAS CONTROLLER Summary The ZABG4002 is a four stage depletion mode FET bias controller intended primarily for satellite Low Noise Block’s (LNB’s), but its also suitable for other LNA applications such as those in found in PMR’s and microwave links. The ZABG4002 provides each FET with an independent protected negative gate voltage and positive drain voltage with user programmable drain current.
PAGE 2
A Product Line of Diodes Incorporated ZABG4002 Device Description NEW PRODUCT The ZABG series of devices are designed to meet the bias requirements of GaAs and HEMT FETs commonly used in satellite receiver LNBs with a minimum of external components whilst operating from a minimal voltage supply and using minimal current. The ZABG4002 provides four FET bias stages, arranged in two pairs of two.
PAGE 3
A Product Line of Diodes Incorporated ZABG4002 Maximum Ratings NEW PRODUCT Parameter Supply Voltage Supply Current Power Dissipation Operating Temperature Range Storage Temperature Range Electrical Characteristics Parameter Operating Voltage Range (note 1) Supply Current Substrate Voltage Rating -0.6 to +10 80 500 -40 to +85 -40 to +150 Unit V mA mW °C °C (Measured at TAMB = 25°C, VCC = 3.
PAGE 4
A Product Line of Diodes Incorporated ZABG4002 Typical Characteristics (Measured at TAMB = 25°C, VCC = 3.3V, RCAL1 = RCAL2 = 39k (setting ID to 10mA) unless otherwise stated) ZABG4002 Drain Voltage vs Drain Current ZABG4002 Drain Current vs RCAL 2.2 15 D rain V o ltag e (V ) D rain C u rren t (m A ) 5 2 1.9 0 10 100 1.8 1000 0 5 RCAL (k) 10 15 Drain Current (mA) ZABG4002 Drain Voltage vs Temperature ZABG4002 Drain Drain Current vs Temperature 2.3 20 18 2.
PAGE 5
A Product Line of Diodes Incorporated ZABG4002 Applications Circuit L* JF1 NEW PRODUCT D3 D2 G3 G2 D4 Vcc L* Vcc C1 10nF D1 C* G1 Vcc ZABG4002 G4 CNB 47nF Rcal2 RCAL2 39k CSUB 47nF * Stripline Elements Csub C2 10nF Cnb1 C* Rcal1 Cnb2 Gnd RCAL1 39k Applications Information Above is a partial applications circuit for the ZABG4002 showing all external components needed for biasing one of the four FET stages available. Each bias stage is provided with a gate and drain pin.
PAGE 6
A Product Line of Diodes Incorporated ZABG4002 Package Outline Dimensions QFN16 3x3 Dim Min Max A 0.55 0.65 A1 0.00 0.05 A3 0.15 Typ b 0.18 0.28 D 2.95 3.05 D2 1.40 1.60 e 0.50 BSC E 2.95 3.05 E2 1.40 1.60 L 0.35 0.45 Z 0.625 Typ All Dimensions in mm E A1 D A3 E2 Pin #1 ID NEW PRODUCT A L D2 e b Z Note: Controlling dimensions are in millimetres. Approximate dimensions are provided in inches.
PAGE 7
A Product Line of Diodes Incorporated ZABG4002 IMPORTANT NOTICE NEW PRODUCT DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).