cha3092 United Monolithic Semiconductors, cha3092 Datasheet - Page 5

• Manufacturer Part Number: cha3092
• Description: 20-33ghz Medium Power Amplifier
• Manufacturer: United Monolithic Semiconductors

20-33GHz Medium Power Amplifier
Typical Bias Tuning
The circuit schematic is given below :
For medium power operation, the four 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 300mA. A separate access to the gate voltages of the two first stages ( Vg1,2 ) is provided
in order to be able to tune the first stages for the application, as a lower noise amplifier or a multiplier.
An additional pad is provided for monitoring the output power, using the Build In Test. This access,
when connected to an external resistor of 10 kOhm ( typical value ) provides a DC voltage which
follows the output power level.
Note : In order to minimize the chip to chip performance spread, it is recommended to bias the chip at
Ref. : DSCHA30920356 21-Dec.-00
fixed drain current Id rather than at fixed Vg voltage.
In addition, to prevent unwanted self-biasing of the gates under gain compression, it is
preferrable to minimize as much as possible the source resistance of the Vg power supply.
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IN
Vd1
Vg1
Vg 2
Vg 2
5/7
Vg 3,4
Specifications subject to change without notice
Vd 2,3,4
Vd 2,3,4
Vdet
OU T
CHA3092