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ZABG6004 Schematic ( PDF Datasheet ) - Diodes

Teilenummer ZABG6004
Beschreibung 6 STAGE FET LNA BIAS CONTROLLER
Hersteller Diodes
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Gesamt 9 Seiten
ZABG6004 Datasheet, Funktion
ZABG6004
6 STAGE FET LNA BIAS CONTROLLER
Summary
The ZABG6004 is an advanced GaAs and HEMT FETs bias controller designed to operate from minimal supply rails and intended primarily for
satellite Low Noise Blocks (LNBs). With the addition of one capacitor and two resistors, the ZABG6004 provides drain voltage and current control
for up to 6 external grounded source FETs. Generating the regulated negative rail required for FET gate biasing whilst operating from a single
supply of 2.1V to 5V. The -2V negative bias can also be used to supply other external circuits. Setting drain currents on the ZABG6004 uses two
resistors and drain current control is split between the six FETs in a group of two and a group of four. This allows the operating current of input
FETs to be adjusted to minimize noise, whilst the following FET stages can be adjusted for maximum gain.
Features
Provides Bias for up to 6 GaAs and HEMT FETs
Operating Range of 2.1V to 5V
Ultra-low Operating Current of 1.1mA
Dynamic FET Protection
Amplifier FET Drain Current Selectable (4mA to 15mA)
Regulated Negative Rail Generator Requires only 1 External
Capacitor
Expended Temperature Range of -40°C to +105°C
U-QFN3030-16 (Type B) Surface Mount Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Low Power LNBs
Digital LNB’s
IP LNB’s
Twin LNB’s and Quad LNB’s
General Purpose LNA Bias
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Twin LNB System Diagrams
Gain Stages
GaAs FETs
Down
Conversion
IF Switching,
gain and
control
ZABG
6004
MUX
IF Gain
Controller
ZABG6004
Document number: DS38917 Rev. 1 - 2
1 of 9
www.diodes.com
December 2016
© Diodes Incorporated






ZABG6004 Datasheet, Funktion
ZABG6004
Application Information
Below are partial applications circuits for the ZABG6004 showing all external components needed for biasing one of the six FET stages available
as a typical LNA (Low Noise Amplifier). Each bias stage is provided with a gate and drain pin. The drain pin provides a regulated 2.0V supply that
includes a drain current monitor. The drain current taken by the external FET is compared with a user selected level, generating a signal that
adjusts the gate voltage of the FET to obtain the required drain current. If for any reason, an attempt is made to draw more than the user set drain
current from the drain pin, the drain voltage will be reduced to ensure excess current is not taken. The gate pin drivers are also current limited.
The bias stages are split up into two groups, with the drain current of each group set by an external RCAL resistor. RCAL1 sets the drain currents of
stages 1 and 4, whilst RCAL2 sets the drain currents of stages 2, 3, 5 and 6.
This allows the optimization of drain currents for differing tasks such as input stages where noise can be critical and later amplifier stages where
gain may be more important. A graph showing the relationship between the value of RCAL and ID is provided in the Typical Characteristics section
of this datasheet.
ZABG6004JA16TC
L*
C*
L*
C1
10nF
*Stripline Elements
VDD
C* C2
10nF
16 15 14 13
D2 1
G2 2
D3 3
G3 4
Gnd
12 G4
11 D5
10 G5
9 D6
5678
CSUB
47nF
The Gnd flag on the underside ZABG6004JA16 must be connected to ground.
The ZABG6004 includes a switched capacitor DC-DC converter that is used to generate the negative supply required to bias depletion mode FETs
used in common source circuit configuration as shown above. This converter uses an external capacitor CSUB as the output reservoir capacitor.
The circuit provides a regulated -2V supply both for gate driver use and for external use if required (for extra discrete bias stages, mixer bias, local
oscillator bias etc.). The -2V supply is available from the CSUB pin.
If any bias stages are not required, their gate and drain pins may be left open circuit. If all bias stages associated with an RCAL resistor are not
required, then this resistor may be omitted.
ZABG6004
Document number: DS38917 Rev. 1 - 2
6 of 9
www.diodes.com
December 2016
© Diodes Incorporated

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