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ZNBG3111

Zetex Semiconductors
Part Number ZNBG3111
Manufacturer Zetex Semiconductors
Description FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
Published Apr 17, 2005
Detailed Description FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION ISSUE 2 - APRIL 1998 DEVICE DESCRIPTION The ZNBG series ...
Datasheet PDF File ZNBG3111 PDF File

ZNBG3111
ZNBG3111

Overview
FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION ISSUE 2 - APRIL 1998 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 three 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 ZNBG3110/11 includes bias circuits to drive up to three external FETs.
A control input to the device selects either one of two FETs as operational, the third FET is p e r m a n e n t l y a ct i v e .
T hi s f e a t u r e i s particularly used as an LNB polarisation switch.
Also specific to LNB applications is the 22KHz tone detection and logic outpu...


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