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CHA2094B Datasheet(PDF) 6 Page - United Monolithic Semiconductors |
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CHA2094B Datasheet(HTML) 6 Page - United Monolithic Semiconductors |
6 / 8 page CHA2094b 36-40GHz Low Noise Amplifier Ref. : DSCHA20949312 – 08-Nov.-99 6/8 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 Typical Bias Tuning for Low Noise Operation The circuit schematic is given below: IN OUT Vd Vg 1,2 Vg 3 100 100 50 For low noise operation, a separate access to the gate voltages of the two first stages (Vgs1&2), and of the output stage (Vgs3) is provided. Nominal bias for low noise operation is obtained for a typical current of 20 mA for the output stage and 15 mA for each of the two first stages (50 mA for the amplifier). The first step to bias the amplifier is to tune the Vgs1&2 = -1V, and Vgs3 to drive 20 mA for the full amplifier. Then Vgs1&2 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&2 bias voltage, but keeping the previous value for Vgs3. |
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Similar Description - CHA2094B |
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