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PDF ZABG6003 Data sheet ( Hoja de datos )
| Número de pieza | ZABG6003 | |
| Descripción | 6 STAGE FET LNA BIAS CONTROLLER | |
| Fabricantes | Diodes | |
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ZABG6003
6 STAGE FET LNA BIAS CONTROLLER
Summary
The ZABG6003 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 a resistor, the ZABG6003 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 ZABG6003 only requires one resistor which controls the drain current of the first stage FETS (D1 and D4). The drain
current is set internally to 10mA for the remaining 4 FETs for the second and third stages. This allows the operating current of input FETs to be
adjusted to minimize noise, whilst the following FET stages are fixed to minimize the number of external components used.
Features
Provides Bias for up to 6 GaAs and HEMT FETs
2 x Amplifier FET Drain Current Programmable (4mA to
15mA)
4 x Amplifier FET Drain Current Internally Fixed to 10mA
Operating Range of 2.1V to 5V
Ultra-low Operating Current of 1.1mA
Dynamic FET Protection
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
Low External Component Count
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Low Power LNB’s
Digital LNB’s
IP LNB’s
Twin 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
6003
MUX
IF Gain
Controller
ZABG6003
Document number: DS38916 Rev. 1 - 2
1 of 8
www.diodes.com
December 2016
© Diodes Incorporated
1 page  
ZABG6003
Application Information
Below is a partial applications circuit for the ZABG6003 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.
VDD
ZABG6003
The bias stages are split up into two groups, with the drain current for D1 and D4 set by an external RCAL1 resistor within the range of 4mA to
15mA. Drain currents for D2, D3, D5 and D6 are internally fixed to 10mA. 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.
The ZABG6003 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 a RCAL resistor are not
required, then this resistor may be omitted. The Gnd flag on the underside of the DFN package can be connected to Gnd or left open circuit.
ZABG6003
Document number: DS38916 Rev. 1 - 2
5 of 8
www.diodes.com
December 2016
© Diodes Incorporated
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZABG6003.PDF ] | |
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