Linear Power Amplifiers - High Frequency Electronics

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High Frequency Design Power Amps needs to be used as a saturated amplifier, P1dB and P3dB performance can be improved by tuning bias condition as a saturated amplifier. Figures 5e and 5f show performance of the PA as a VGA. PA gain has been varied using gate bias. Performance of 17.7 - 19.7 GHz Linear Power Amplifier (RFPA1702) Figures 6a - 6f show measured performance RFPA1702. This PA covers 18 GHz band of P2P radio application. All the measurements are taken at Vd=5.5, Id (total) =1.3A unless otherwise noted. Figures 6a - 6c show the PAs gain and OIP3 (at P OUT =+15 and +24dBm/ SCL) versus frequency behavior over temperature. Figure 6c shows P1dB and P3dB behavior of the PA when biased to achieve best IM3 performance. Figures 6e - 6f show performance of the PA as a VGA. PA gain has been varied using gate bias. P OUT = 22/21 and 20 dBm for the various bands. P1dB and Psat was measured under best IM3 tuned case, if the amp needs to be used as a saturated amplifier a different biasing scheme can be used for better P OUT performance at the cost of IM3/OIP3. All PA designs incorporate on-chip package compensation networks for good I/O match and are packaged in a low-cost 6 x 6 ceramic package for better thermal performance. Due to superior IM3/OIP3 performance of these PAs, they are well suited for high data rate and complex modulation systems. About the Authors: The authors work at RFMD, where Sushil Kumar is Director, Engineering; Kent Story is a Staff Design Engineer; Ron Kielmeyer is a Staff Design Engineer; Tariq Lodhi is a Senior Design Engineer; and Ian Hardcastle is a Staff Design Engineer. References: 1. http://www.rfmd.com/CS/Documents/ RFPA1002DS.pdf 2. http://www.rfmd.com/CS/Documents/ RFPA1003DS.pdf 3. http://www.rfmd.com/CS/Documents/ RFPA1702DS.pdf Conclusion The performance of RFMD’s linear power amplifiers is summarized in Table 2. These PAs demonstrate high gain and high IM3/OIP3 values at high P OUT (total) = 28 dBm for 10, 11, 13, and 15 GHz band applications. For 18, 23, and 26 GHz bands, the IM3/OIP3 was measured at P OUT (total) = 27 and 26 dBm. These PAs show very good performance as VGAs and, by adjusting gate bias, a gain dynamic range of >15 dB can be achieved. These PAs maintain decent IM3/OIP3 performance, a much desired feature to dynamically adjust power consumption of a PA. IM5 performance of the PAs is >60 dBc at Table 2 • Summary of RFMD’s Linear Power Amplifiers. 40 High Frequency Electronics
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Linear Power Amplifiers - High Frequency Electronics

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