ZBNG4000 データシートの表示（PDF） - Zetex => Diodes

部品番号

コンポーネント説明

メーカー

ZBNG4000

FET BIAS CONTROLLER

Zetex => Diodes 

ZNBG4000 ZNBG4001

ZNBG6000 ZNBG6001

APPLICATIONS INFORMATION (Continued)

The ZNBG devices have been designed to protect the external FETs from adverse operating

conditions. With a JFET connected to any bias circuit, the gate output voltage of the bias circuit

can not exceed the range -3.5V to 0.7V, under any conditions including powerup and powerdown

transients. Should the negative bias generator be shorted or overloaded so that the drain current

of the external FETs can no longer be controlled, the drain supply to FETs is shut down to avoid

damage to the FETs by excessive drain current.

The following diagrams show the ZNBG4000/1 and ZNBG6000/1 in typical LNB applications.

Within each FET gain stage the numbering system indicates how the bias stages relate to the

application circuits. This is important when RCAL values are used to set differing drain currents.

Dual standard or enhanced LNB block diagram

4-143

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