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MC13821 Scheda tecnica(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC13821 Scheda tecnica(HTML) 10 Page - Freescale Semiconductor, Inc |
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10 / 42 page  Application Information MC13821 Advance Information, Rev. 1.0 10 Freescale Semiconductor Figure 8. Input 3rd Order Intercept Point vs. Icc for the 2140 MHz Application Circuit (Rbias varied from 1.2 k Ω to 3 kΩ) 3 Application Information The MC13821 SiGe:C LNA is designed for applications in the 1000 MHz to 2.4 GHz range. It has three different modes: High Gain, Low Gain (Bypass) and Disabled. The IC is programmable through the Gain and Enable pins. The logic truth table is given in Table 5. 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 utilized. For a particular application or spec requirement, the matching can be changed to achieve enhanced performance of one parameter at the expense of other parameters. Application information for 1575, 1960, 2140 and 2400 MHz are shown. For each application, two current drain examples are provided. Typical RF performance is shown for two values of bias resistor R1: 1.2 k Ω and 2 k Ω, see Table 6, Table 7, Table 8, and Table 9. These two current drain states offer variation in intercept point, gain, and noise figure. For 1960 and 2140 MHz, additional application circuits are shown. These demonstrate specific performance characteristics and utilize varying input and output matches and different biasing resistors. Measurements are made at a bias of VCC = 2.75 V. Freq. spacing for IP3 measurements is 200 kHz. Non-linear measurements are made at Pin = -30 dB. The board loss corrections for these boards are: Input 0.16 dB, Output 0.2 dB. Gain and NF results incorporate these corrections in order to better reflect the actual performance of the device. 3.1 1575 MHz Application This application circuit was designed to provide NF < 1.2 dB, S21 gain > 18 dB, OIP3 of 18 dBm with S11 better than -10 dB and S22 better than -10 dB at 1575 MHz with unconditional stability from 100 MHz to 10 GHz. Typical performance that can be expected from this circuit at 2.75 V VCC is listed in Table 6. Input 3rd Order Intercept Point vs. Icc 2140 MHz Application Circuit -2 -1 0 1 2 3 4 5 6 12 34 5 Icc (mA) |
Codice articolo simile - MC13821 |
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Descrizione simile - MC13821 |
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