CHA2091-99F/00 UMS [United Monolithic Semiconductors], CHA2091-99F/00 Datasheet - Page 7

• Manufacturer Part Number: CHA2091-99F/00
• Description: 36-40GHz Low Noise Amplifier
• Manufacturer: UMS [United Monolithic Semiconductors]

36-40GHz Low Noise Amplifier
This chip 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.
The two requirements are :
N°1 : Not exceed Vds = 3.5Volt
N°2 : Not biased in such a way that Vgs becomes positive.
We propose two standard biasing :
Low Noise and low consumption :
Low Noise and high output power :
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.
Chip Biasing
Ref. : DSCHA20919340 -06 Dec. 99
Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE
Tel.: [phone] - Fax : [phone]
IN
Vg 1
Vds1
( internal Drain to Source voltage ).
( internal Gate to Source voltage )
Vd = 3.5V and Id = 30mA.
Vd = 4.0V and Id = 45mA.( A separate acces to
50
7/8
Vg 2
Vd
Specifications subject to change without notice
Vds2
25
OUT
CHA2091