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MGA-85563 Datasheet(PDF) 9 Page - AVAGO TECHNOLOGIES LIMITED |
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MGA-85563 Datasheet(HTML) 9 Page - AVAGO TECHNOLOGIES LIMITED |
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9 / 13 page  9 PCB Materials FR-4 or G-10 type materials are good choices for most low cost wireless applications using single or multi-layer printed circuit boards. Typical single-layer board thick- ness is 0.020 to 0.031 inches. Circuit boards thicker than 0.031 inches are not recommended due to excessive inductance in the ground vias. For noise figure critical or higher frequency applications, the additional cost of PTFE/glass dielectric materials may be warranted to minimize transmission line loss at the amplifier’s input. Application Example The printed circuit layout in Figure 19 can be used with the MGA-85563 for frequencies from 800 MHz through 6 GHz. This layout is a microstripline design (solid ground- plane on the backside of the circuit board) with 50 Ω in- terfaces for the RF input and output. The circuit is fabri- cated on 0.031-inch thick FR-4 dielectric material. Plated through holes (vias) are used to bring the ground to the top side of the circuit where needed. Multiple vias are used to reduce the inductance of the paths to ground. IN OUT Rbias +Vd MGA-85-A Figure 19. Multi-purpose PCB Layout. 1.9 GHz Design To illustrate the simplicity of using the MGA-85563, a 1.9 GHz amplifier for PCS type receiver applications is present- ed. To achieve minimum noise figure, the 50 Ω input to the amplifier is matched to *opt. From the table of Typical Noise Parameters, the value of *opt at 1.9 GHz is found to be 0.56 +33°. The conjugate of *opt, 0.56 -33°, is plotted on the Smith chart as Point A in Figure 20. The addition of a 0.108 inch length (actual length on FR-4; electrical length is 11.7° of 50 Ω transmission line (MLIN) rotates Point A around to the R = 1 circle on the Smith chart. A series 5.6 nH inductor (L1) is then all that is re- quired to complete the match to 50 Ω. A 1 C A ( Γopt) B 2 -2 B 0.5 0.5 0.2 -0.2 0.2 2 -0.5 -1 MLIN RF Input C (50 Ω) L1 Figure 20. Input Impedance Match. The output of the MGA-85563 is already well matched to 50 Ω and no additional matching is needed. The resulting RF circuit is shown in Figure 21. 5.6 nH 50 Ω 0.108 in. RF Outp MGA- 85563 RF Input Figure 21. Input Circuit for 1.9 GHz. A schematic diagram of the complete 1.9 GHz circuit with the input noise match and DC biasing is shown in Figure 22. RFC RF Input C4 C3 Vd RF Output Notes: L1 = 5.6 nH RFC = 22 nH C1 – C4 = 56 pH MLIN = 0.108 inch, 50 Ω (C1, C4 and Rb are optional) L1 C1 C2 MLIN Rb Figure 22. Schematic of 1.9 GHz Circuit. DC bias is applied to the MGA-85563 through the RFC at the RF Output pin. The power supply connection is by- passed to ground with capacitor C3. Provision is made for an additional bypass capacitor, C4, to be added to the bias line near the +3 volt connection. C4 will not normal- ly be needed unless several stages are cascaded using a common power supply. The optional resistor, Rb, may be added if desired to in- crease device current to handle higher level signals. The use of the bias-setting resistor will not affect the input matching circuit. |
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