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ZBNG4000 Datasheet(PDF) 6 Page - Zetex Semiconductors

Part No. ZBNG4000
Description  FET BIAS CONTROLLER
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Manufacturer  ZETEX [Zetex Semiconductors]
Direct Link  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZBNG4000 Datasheet(HTML) 6 Page - Zetex Semiconductors

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ZNBG4000
ZNBG4000 ZNBG4001
ZNBG6000 ZNBG6001
TYPICAL APPLICATION CIRCUIT
APPLICATIONS INFORMATION
The above is a partial application circuit for the ZNBG series showing all external components
required for appropriate biasing. The bias circuits are unconditionally stable over the full
temperature range with the associated FETs and gate and drain capacitors in circuit.
Capacitors CD and CG ensure that residual power supply and substrate generator noise is not
allowed to affect other external circuits which may be sensitive to RF interference. They also
serve to suppress any potential RF feedthrough between stages via the ZNBG device. These
capacitors are required for all stages used. Values of 10nF and 4.7nF respectively are
recommended however this is design dependent and any value between 1nF and 100nF could
be used.
The capacitors CNB and CSUB are an integral part of the ZNBGs negative supply generator. The
negative bias voltage is generated on-chip using an internal oscillator. The required value of
capacitors CNB and CSUB is 47nF. This generator produces a low current supply of approximately
-3 volts. Although this generator is intended purely to bias the external FETs, it can be used to
power other external circuits via the CSUB pin.
Resistors RCAL1/2 sets the drain current at which all external FETs are operated. Both ZNBG devices
have the facility to program different drain currents into selected FETs. Two RCAL inputs are
provided. For the ZNBG4000, resistor RCAL1 sets the drain current of FETs 1 and 2, resistor RCAL2
sets the drain current of FETs 3 and 4. For the ZNBG6000, resistor RCAL1 sets the drain current
of FETs 1 and 4, resistor RCAL2 sets the drain current of FETs 2, 3, 5 and 6. If the same drain current
is required for all FETs on either device then pins RCAL1 and RCAL2 can be wired together and
shunted to ground by a single calibration resistor of half normal value.
If any bias control circuit is not required, its related drain and gate connections may be left open
circuit without affecting the operation of the remaining bias circuits. If all FETs associated with
a current setting resistor are omitted, the particular RCAL should still be included. The supply
current can be reduced, if required, by using a high value RCAL resistor (e.g. 470k).
4-142


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