CHA2097A_15 Datasheet, PDF (7/8 Pages) United Monolithic Semiconductors – 20-40GHz Variable Gain Amplifier

20-40GHz Variable Gain Amplifier
Typical Bias Tuning
The circuit schematic is given below:
Vd1
Vd 2,3
IN
CHA2097a
OUT
Attenuator
Vctrl
Vg1
Vg 2
Vg 3
For gain control operation, the three drain biases are connected altogether. In a same way, all the gate
biases are connected together at the same power supply, tuned to drive a small signal operating
current of 140mA. A separate access to the gate voltages of each stage (Vg1, 2, 3) is provided for fine
tuning of the stages regarding the application.
An additional pad is provided (Vctrl) to control the gain of the circuit, driving two cold transistors in
attenuator arrangement.
Ref. : DSCHA20978021-21 Jan 08
7/8
Specifications subject to change without notice
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