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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCF5079 датащи(PDF) 17 Page - NXP Semiconductors |
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PCF5079 датащи(HTML) 17 Page - NXP Semiconductors |
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17 / 28 page  2001 Nov 21 17 Philips Semiconductors Product specification Dual-band power amplifier controller for GSM, PCN and DCS PCF5079 12.2 PA protection against mismatch High VSWR at the PA output may occur in systems where the PA is connected to the antenna via couplers and switches with low insertion loss, depending on the antenna matching. The incident and reflected power have to be monitored and care has to be taken to prevent the summed RF power does not exceed the defined maximum value at the PA output. As two sensor inputs are available in the PCF5079, two different detector signals can be combined: one for direct path and one for reflected path. These two voltages, fed to the sensor inputs, are summed inside the PCF5079 resulting in a decrease in the PA output power if there is an increase of the VSWR at the antenna port (see Fig.15). handbook, full pagewidth MGT330 PA band select switch D1 D2 C1 VS1 C2 VS2 R2 R1 RFin HB RFout RFin LB broad band coupler Fig.15 Example of PA mismatch protection circuit. Table 3 Table of components (see Fig.15) SYMBOL COMPONENT DESCRIPTION D1, D2 detector diode Philips 1PS79SB62 R1, R2 resistor R = 1 k Ω (decoupling versions) C1, C2 capacitor C = 39 pF − band select switch Motorola; Alpha Industries; M/A; COM GaAs MMIC; or discrete pin diode, e.g. Philips BAP51-03 − broad band coupler Murata LCD20 series; TDK HHM 20, 22 series |
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