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CHA2193 Datasheet(PDF) 7 Page - United Monolithic Semiconductors |
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CHA2193 Datasheet(HTML) 7 Page - United Monolithic Semiconductors |
7 / 10 page 20-30GHz Low Noise Amplifier CHA2193 Ref. : DSCHA21939042-11 Feb 99 7/10 Specifications subject to change without notice Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 -8 -6 Input power (dBm) Gain (dB) Pout (dBm) Typical Bias Tuning for Low Noise Operation For low noise operation, a separate access to the gate voltages of the first stage ( Vgs1 ), and of the second and third stages ( Vgs2 ) is provided. Nominal bias for low noise operation is obtained for a typical current of 20 mA for the second and third stages and 10 mA for the first stage ( 50 mA for the amplifier ). The first step to bias the amplifier is to tune the Vgs1 = -1V, and Vgs2 to drive 40 mA for the full amplifier. Then Vgs1 is reduced to obtain 50 mA of current through the amplifier. A fine tuning of the noise figure may be obtained by modifying the Vgs1 bias voltage, but keeping the previous value for Vgs2. |
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