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MC13155 Scheda tecnica(PDF) 6 Page - Motorola, Inc |
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MC13155 Scheda tecnica(HTML) 6 Page - Motorola, Inc |
6 / 16 page MC13155 6 MOTOROLA ANALOG IC DEVICE DATA In the S–parameters measurements, the IF is treated as a two–port linear class A amplifier. The IF amplifier is measured with a single–ended input and output configuration in which the Pins 16 and 7 are terminated in the series combination of a 47 Ω resistor and a 10 nF capacitor to VCC ground (see Figure 14. S–Parameter Test Circuit). The S–parameters are in polar form as the magnitude (MAG) and angle (ANG). Also listed in the tables are the calculated values for the stability factor (K) and the Maximum Available Gain (MAG). These terms are related in the following equations: K = (1– IS11 I2 – I S22 I2 + I ∆ I2 ) / ( 2 I S12 S21 I ) where: I ∆ I = I S11 S22 – S12 S21 I. MAG = 10 log I S21 I / I S12 I + 10 log I K – ( K2 – 1)1/2 I where: K > 1. The necessary and sufficient conditions for unconditional stability are given as K > 1: B1 = 1 + I S11 I2 – I S22 I2 – I ∆ I2 > 0 IN2 DEC2 VEE1 RSSI Buffer RSSI VEE2 LIMO2 QUAD2 QUAD1 LIMO1 VCC2 DETO2 DETO1 VCC1 DEC1 IN1 9 10 11 12 13 14 15 16 8 7 6 5 4 3 2 1 Figure 14. S–Parameter Test Circuit SMA IF Input VEE + 100n 1.0n 47 1.0n C15 1.0n C2 1.0n SMA 47 1.0n IF Output 10 µ Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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