CHA2190-99F/00(2003) View Datasheet(PDF) - United Monolithic Semiconductors
Part Name
Description
Manufacturer
CHA2190-99F/00 Datasheet PDF : 8 Pages
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20-30GHz Low Noise Amplifier
CHA2093
Chip Biasing
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.
Vd
50
25
IN
OUT
Vds1
Vds2
Vg 1
Vg 2
The two requirements are :
N°1 : Not exceed Vds = 3.5V
( 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 :
Low Noise and low consumption :
Vd = 3.5V and Id = 30mA ( Vg1=Vg2)
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.
Ref. : DSCHA20933279 - 06 Oct 03
7/8
Specifications subject to change without notice
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Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
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