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The ZABG4003 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 two resistors, the ZABG4003 provides drain voltage and current control for up to 4 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 ZABG4003 uses two resistors to split control between two pairs of FETs. This allows the operating current of input FETs to be adjusted to minimize noise, whilst the following FET stages can separately be adjusted for maximum gain.
Low Power LNB’s
Twin LNB’s and Quad LNB’s
General Purpose LNA Bias
Provides Bias for up to 4 GaAs and HEMT FETs
Operating Range of 2.1V to 5V
Ultra-low Operating Current of 0.95mA
Dynamic FET Protection
Amplifier FET Drain Current Selectable (4mA to 15mA)
Regulated Negative Rail Generator Requires only 1 External Capacitor