CHA2093RBF

20-30GHz Low Noise Amplifier

Ref. : DSCHA2093RBF2057 -26-Feb.-02-

4/8

Specifications subject to change without notice

Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE

Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09

Biasing Options

This chip inside the SMD type package is a two stage amplifier, and flexibility is provided by

the access to number of pads. The internal DC electrical schematic is given in order to use

these pads in a safe way.

IN

OUT

Vg 1

Vg 2

25

50

Vd

Vds1

Vds2

The two requirements are :

N°1:

Not exceed Vds = 3.5Volt

( internal Drain to Source voltage ).

N°2:

Not biased in such a way that Vgs becomes positive.

( internal Gate to Source voltage )

We propose two standard biasing :

1)

Low Noise and low consumption :

Vd = 3.5V and Id = 30mA ( Vg1=Vg2)

2)

Low Noise and high output power :

Vd = 4.0V and Id = 45mA.

(A separate acces to the gate voltages of the first and the output stage is provided.

Nominal bias is obtained for a typical current of 30mA for the output stage and 15 mA

for the first stage. The first step to bias the amplifier is to tune the Vg1 =-1V and Vg2

to drive 30mA for the full amplifier. Then Vg1 is reduced to obtain 45 mA of current

through the amplifier.)