ZNBG3010Q16

FET BIAS CONTROLLER AND POLARITY SWITCH ISSUE 1 - FEBRUARY 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 ZNBG3010/11 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. Drain current setting of the ZNBG3010/11 is user selectable over the range 0 to 15mA, this is achieved with addition of a single resistor. The series also offers the choice of drain voltage to be set for the FETs, the ZNBG3010 gives 2.2 volts drain whilst the ZNBG3011 gives 2 volts. ZNBG3010 ZNBG3011 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. It is possible to use less than the devices full complement of FET bia...