900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Diodes Semiconductor Electronic Components Datasheet

ZNBG4003 Datasheet

4 STAGE FET LNA BIAS CONTROLLER

No Preview Available !

DataSheet.in
A Product Line of
Diodes Incorporated
ZNBG4003
4 STAGE FET LNA BIAS CONTROLLER
Summary
The ZNBG4003 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 ZNBG4003 provides each
FET with a negative gate voltage and positive drain voltage with user programmable drain current.
Features
Four stage FET bias controller
Operating range of 5.0V to 8.0V
FET drain voltages set at 2.0V
FET drain current selectable from 0 to 15mA
Allows first and second stage FETs to be run at different
(optimum) drain currents
FET drain voltages and currents stable over temperature
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
D2
G2
VCC
GND
Top View
CSUB
G3
D4
G4
RCAL1
Applications
Two single type Twin LNB’s
Twin LNB’s
Quad LNB’s
Microwave links
PMR and Cellular telephone systems
Bottom View
Single Universal LNB System Diagram
 
Gain stages
GaAs FET’s
Down
Converter
IF Switching, gain
and control
ZANBG
460023
ZXHF
5002
ZNBG4003
Document number: DS35007 Rev. 1 - 2
1 of 7
www.diodes.com
August 2010
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

ZNBG4003 Datasheet

4 STAGE FET LNA BIAS CONTROLLER

No Preview Available !

DataSheet.in
A Product Line of
Diodes Incorporated
ZNBG4003
Device Description
The ZNBG 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.
The ZNBG4003 provides four FET bias stages, arranged in
two pairs of two. Resistors connected to pins Rcal1 and
Rcal2 set the FET drain currents of each pair over the range
of 0 to 15mA, allowing input FETs to be biased for optimum
noise and amplifier FETs for optimum gain.
Drain voltages of all stages are set at 2.0V. The drain
supplies are current limited to approximately 5% above the
operating currents set by the Rcal resistors.
Depletion mode FETs require a negative voltage bias supply
when operated in grounded source circuits. The ZNBG4003
includes an integrated switched capacitor DC-DC converter
generating a regulated output of -2.5V to allow single supply
operation.
These devices are unconditionally stable over the full working
temperature with the FETs in place, subject to the inclusion
of the recommended gate and drain capacitors. These
ensure RF stability and minimal injected noise.
It is possible to use less than the devices full complement of
FET bias controls, unused drain and gate connections can be
left open circuit without affecting operation of the remaining
bias circuits.
To protect the external FETs the circuits have been designed
to ensure that, under any conditions including power up/down
transients, the gate drive from the bias circuits cannot exceed
-3V. Additionally each stage has its own individual current
limiter. Furthermore if the negative rail experiences a fault
condition, such as overload or short circuit, the drain supply
to the FETs will shut down avoiding excessive current flow.
To minimise PCB space ZNBG4003 is packaged in the
16 pin 3mm x 3mm QFN package.
Device operating temperature is -40°C to 85°C to suit a wide
range of environmental conditions.
ZNBG4003
Document number: DS35007 Rev. 1 - 2
2 of 7
www.diodes.com
August 2010
© Diodes Incorporated


Part Number ZNBG4003
Description 4 STAGE FET LNA BIAS CONTROLLER
Maker Diodes Incorporated
PDF Download

ZNBG4003 Datasheet PDF






Similar Datasheet

1 ZNBG4000 FET BIAS CONTROLLER
Zetex Semiconductors
2 ZNBG4001 FET BIAS CONTROLLER
Zetex Semiconductors
3 ZNBG4003 4 STAGE FET LNA BIAS CONTROLLER
Diodes Incorporated





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy