ZNBG2001X10 ZETEX [Zetex Semiconductors], ZNBG2001X10 Datasheet

ZNBG2001X10

Manufacturer Part Number

ZNBG2001X10

Description

FET BIAS CONTROLLER

Manufacturer

ZETEX [Zetex Semiconductors]

Datasheet

1.ZNBG2001X10.pdf (7 pages)

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FET BIAS CONTROLLER

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, PMR,

cellular telephones etc. with a minimum of external

components.

With the addition of two capacitors and a resistor the

devices provide drain voltage and current control for

2 external grounded source FETs, generating the

regulated negative rail required for FET gate biasing

whilst operating from a single supply. This negative

bias, at -3 volts, can also be used to supply other

external circuits.

The ZNBG2000/1 contains two bias stages. A single

resistor allows FET drain current to be set to the

desired level. The series also offers the choice of

drain voltage to be set for the FETs, the ZNBG2000

gives 2.2 volts drain whilst the ZNBG2001 gives 2

volts.

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.

FEATURES

ISSUE 1 - AUGUST 2001

Provides bias for GaAs and HEMT FETs

Drives up to two FETs

Dynamic FET protection

Drain current set by external resistor

Regulated negative rail generator requires only 2

external capacitors

Choice in drain voltage

Wide supply voltage range

MSOP surface mount package

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.

In order 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 the range -3.5V

to 0.7V. 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.

The ZNBG2000/1 are available in MSOP10 packages

for the minimum in devices size. Device operating

temperature is -40 to 80°C to suit a wide range of

environmental conditions.

APPLICATIONS

Satellite receiver LNBs

Private mobile radio (PMR)

Single in single out C Band LNB

Cellular telephones

ZNBG2000

ZNBG2001

Related parts for ZNBG2001X10

ZNBG2001X10 Summary of contents

Page 1

FET BIAS CONTROLLER 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, PMR, cellular telephones etc. with a minimum of external components. With the ...

Page 2

ZNBG2000 ZNBG2001 ABSOLUTE MAXIMUM RATINGS Supply Voltage Supply Current Drain Current (per FET) (set by R and R ) CAL1 CAL2 ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise SYMBOL PARAMETER V Supply Voltage CC I Supply Current CC V Substrate Voltage ...

Page 3

Rcal (k) JFET Drain Current v Rcal 2.4 2.3 2.2 Vcc = 10V 2.1 2 Drain Current (mA) JFET Drain Voltage ...

Page 4

ZNBG2000 ZNBG2001 FUNCTIONAL DIAGRAM DESCRIPTION The ZNBG devices provide all the bias requirements for external FETs, including the generation of the negative supply required for gate biasing, from the single supply voltage. The diagram above shows a single stage from ...

Page 5

TYPICAL APPLICATION CIRCUIT 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 ...

Page 6

... ZNBG2000 ZNBG2001 INFORMATION CONT. ZNBG2000 GND CNB1 CNB2 ORDERING INFORMATION Part Number ZNBG2000X10 ZNBG2001X10 ZNBG2000/01 Pinout For MSOP10 Package Designator - X 1 VCC D2 G2 RCAL CSUB Package Part Mark MSOP10 ZNBG2000 MSOP10 ZNBG2001 9 6 APPLICATIONS QTY Reel 4000 4000 ISSUE 1 - AUGUST 2001 ...

Page 7

PACKAGE DIMENSIONS DIM Millimetres A 1.10 B 0.23 C 0.18 D 0.50 E 3.00 © Zetex plc 2001 Zetex plc Zetex GmbH Fields New Road Streitfeldstraße 19 Chadderton D-81673 München Oldham, ...

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