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MADC-010736-TR0200 Datasheet(PDF) 5 Page - M/A-COM Technology Solutions, Inc. |
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MADC-010736-TR0200 Datasheet(HTML) 5 Page - M/A-COM Technology Solutions, Inc. |
5 / 6 page Receiver, High IIP3, SMD 40.5 - 43.5 GHz Rev. V2 MADC-010736 5 5 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: https://www.macom.com/support 5 App Note [1] Biasing - The MADC-010736 is operated by biasing VD1, VD2, and VD3 at 4.0 V. The corresponding drain currents are set to 10 mA, 100 mA, and 180 mA respectively. VG4 requires a fixed voltage bias of nominally –3.0 V. It is recommended to use active bias on VG1, VG2, VG3 to keep the currents in VD1, VD2, and VD3 constant, in order to maintain the best performance over temperature. Depending on the supply voltages available and the power dissipation constraints, the bias circuits may include a single transistor or a low power operational amplifier, with a low value resistor in series with the drain supply to sense the current. Make sure to sequence the applied voltage to ensure negative gate bias is available before applying the positive drain supply. App Note [2] I/Q - For highest gain, best image rejection and lowest noise figure all 4 IF ports should be used. I/ I* and Q/Q* will combine through two 180 degree hybrid couplers generating inphase and quadrature phase components. Inphase and quadrature signals then need to be combined through 90 degree hybrid combiner to create IF output. App Note [3] Board Layout - It is recommended to provide 100 pF decoupling capacitors as close to the bias pins as possible. Additional 10 nF and 1 µF on each of the bias lines are recommended placed a distance further away. 90 deg Hybrid IF Output Q* Q I I* VG4 RF VD2 VG2 VD1 VG1 VD3 VG3 LO 1 2 3 4 5 6 7 13 12 11 10 9 8 Q* Q I I* IRM LNA BUF BUF 2X 180 deg Hybrid 180 deg Hybrid |
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