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MC13851 Arkusz danych(PDF) 9 Page - Freescale Semiconductor, Inc |
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MC13851 Arkusz danych(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 34 page Application Information MC13851 Advance Information, Rev. 2.0 Freescale Semiconductor 9 Figure 6 shows the Icc current drain for a range of values for the external bias resistor Rbias. Figure 6. Icc vs. Bias Resistor R1 Value 3 Application Information The MC13851 LNA is designed for applications in the 1000 MHz to 2.5 GHz range. It has three different modes: High Gain, Low Gain (bypass) and standby. The LNA is programmable through the Gain and Enable pins. The logic truth table is given in Table 3. The internal bypass switch is designed for broadband applications. One of the advantages of the MC13851 is the simplification of the matching network in both bypass and amplifier modes. The bypass switch is designed so that changes of input and output return losses between bypass mode and active mode are minimized and the matching network design is simplified. In these application examples a balance is made between the competing RF performance characteristics of Icc, NF, gain, IP3 and return losses with unconditional stability. Conjugate matching is not used for the input or output. Instead, matching which achieves a trade-off in RF performance qualities is used. For a particular application or specification requirement, the matching can be changed to achieve enhanced performance of one parameter. Measurements are made at a bias of Vcc=2.75 V. Frequency spacing for IP3 measurements is 200 kHz. Non-linear measurements are made at Pin = -30 dBm. Typical application circuits are provided for 1575 MHz, 1960 MHz, 2140 MHz and 2.4 GHz applications. Typical RF performance is shown for two values of bias resistor R1: 1.2 k Ω and 1.5 kΩ. These two current drain levels offer variations in intercept point, gain and noise figure. Included with each application are the schematics and electrical performance. Section 4, “Printed Circuit and Bill of Materials” provides the evaluation board layout and Bill of Material for the circuits. Section 5, “Scattering and Noise Parameters” provides Smith charts with gain and noise circles for each application frequency. 3.1 1575 MHz Application This application was designed to provide typical NF = 1.28 dB, S21 gain = 19 dB, OIP3 =14.5 dBm with return losses better than -10 dB at 1575 MHz. Typical performance that can be expected from this circuit at 2.75V is listed in Table 6. The component values can be changed to enhance the performance of a particular parameter, but usually at the expense of another. Two values of bias resistor R1 are shown to y = 1.5497x2 ‐ 7.6446x + 11.822 R² = 0.981 2 2.5 3 3.5 4 4.5 5 1.1 1.3 1.5 1.7 1.9 2.1 Rbias value (kohm) Icc mA Poly. (Icc mA) |
Podobny numer części - MC13851 |
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Podobny opis - MC13851 |
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