Linear Power Amplifiers - High Frequency Electronics

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High Frequency Design LNA Design Figure 2 • Stability Factor (K) and Stability Meas (b). Schematic Circuit and Optimization Optimization is necessary to achieve the performance listed on the application note since the chosen substrate thickness and layout for this demonstration is different than that of the manufacturer’s reference design [3]. In addition, details like the passive component size and manufacturer information are not listed in the application note. The available Modelithics models are tailored to the specifics of manufacturer component family and body style and are substrate scalable. Model inputs were setup for applicability to the 16 mil Rogers 4003 board chosen for this design. Figure 3 shows the schematic after optimization. Figure 4 and Figure 5 include plots of the optimized simulation results. Simulations show a Gain of 15.8 dB at 1880 MHz, 0.7 dB Noise Figure, -5.4 dB Input Return Loss and -15.8 dB Output Return Loss under Vds=3V at Id=55.7mA. This is close to the manufacturer’s performance [3]. Table 5 shows the updated optimized component part list using Modelithics Models. Figure 3 • Optimized Schematic for LNA. Models shown are Modelithics CLR passive models. Layout and Fabrication As mentioned above, a 16mil Rogers 4003 substrate was used for the board fabrication. RF probe pads and grounding pads were added into Figure 6 to facilitate testing with ground-signal-ground (GSG) RF wafer Table 4 • Manufacturer’s Component Parts List for LNA Reference Design. Table 5 • Manufacturer’s Component Parts List Along with Modifications to Optimization using Modelithics Models (See Fig. 5 for details of usage in circuit). 26 High Frequency Electronics
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