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UAA1570HL Datasheet(PDF) 11 Page - NXP Semiconductors |
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UAA1570HL Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 76 page  1999 May 10 11 Philips Semiconductors Product specification Global Positioning System (GPS) front-end receiver circuit UAA1570HL 7 FUNCTIONAL DESCRIPTION The programmability of the UAA1570HL and flexible interface definitions allow the device to be configured for a wide range of applications. To restrict the content of this document the functional description of the device will generally concentrate on the C/A-code application circuit based on the default frequency plan. The application circuit does not allow easy measurement, calibration and documentation of the many sub-block characteristics which ensure good system performance. Therefore, test boards have been developed which allow direct measurement of the sub-block characteristics. The tables and graphs reflect the UAA1570HL specification as derived from simulation and measured results in these characterization board environments. The tables and graphs do not directly specify application board expectations. The functional description however, focuses on the default application. The RF system diagram (see Fig.3) illustrates the default application of the UAA1570HL in the Philips GPS demonstration board. In this application the UAA1570HL is intended to be operated directly from a passive GPS antenna through a very short antenna cable. Any cable loss in this demonstrator adds directly to the system noise figure and should therefore be minimized. LNA1 can be powered down in the UAA1570HL to accommodate applications built around external LNAs, typically where long antenna cable runs are required. The first LNA is assumed to be matched with a 2nd-order band-pass structure to provide some input selectivity, since no dielectric or SAW filter has been used in the demonstration board. It should be noted that low loss RF SAW filters now make it possible to significantly improve the jam immunity of this amplifier, by placing a SAW filter at the output of the antenna. On the demonstration board the first LNA is followed by a low loss RF SAW filter (<2.4 dB). On the demonstration board the second LNA has been matched to 50 Ω using a simple transmission line structure. Finally, another identical RF SAW filter follows the second LNA into the first mixer. |
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