CHA2192

24-26.5GHz Low Noise Amplifier

Ref. : DSCHA21928155

4/6

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

Typical on Wafer Measurements

Bias conditions: Vd=3.5V, Id= 40mA

-20,00

-15,00

-10,00

-5,00

0,00

5,00

10,00

15,00

20,00

10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

Frequency ( GHz )

NF

Gain

dBS11

dBS22

Typical Bias Tuning for Low Noise Operation

For low noise operation, a separate access to the gate voltages of the input stage ( Vgs1 ) and of the

output stage ( Vgs2 ) is provided.

Nominal bias for low noise operation is obtained for a typical current of 20 mA for the output stage and

10 mA for the input stage ( 30 mA for the amplifier ).

The first step to bias the amplifier is to tune the Vgs1 = -1V, and Vgs2 to drive 20 mA for the full

amplifier. Then Vgs1 is reduced to obtain 30 mA of current through the amplifier.

A fine tuning of the noise figure may be obtained by modifying the Vgs1 bias voltage, but keeping the

previous value for Vgs2.