cha2093 United Monolithic Semiconductors, cha2093 Datasheet - Page 7

• Manufacturer Part Number: cha2093
• Description: 20-30ghz Low Noise Amplifier
• Manufacturer: United Monolithic Semiconductors

20-30GHz 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 = 3.5V
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 : Vd = 4.0V and Id = 45mA. A separate access 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.
Chip Biasing
Ref. : DSCHA20933279 - 06 Oct 03
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 ( Vg1=Vg2)
50
7/8
Vg 2
Vd
Specifications subject to change without notice
Vds2
25
OUT
CHA2093