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AT86RF211DAI-R 数据表(PDF) 14 Page - ATMEL Corporation |
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AT86RF211DAI-R 数据表(HTML) 14 Page - ATMEL Corporation |
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14 / 48 page  14 AT86RF211 1942C–WIRE–06/02 Figure 16. LC Band-pass Filter • 10 nF capacitors cut DC response forward and backward. • The first network has the low cut-off frequency. • The second network has the high cut-off frequency. IF2 Amplifier Chain The input impedance of the IF2 amplifier is 1700 Ω. This value enables the use of popu- lar filters with impedance between 1500 Ω and 2000Ω. It is directly connected to the FSK demodulator. The bandwidth is internally limited to 1 MHz to minimize the noise before the discriminator. It acts like a band pass filter centered at 455 kHz with capacitive cou- pling between stages of amplifier and mixer. Total voltage gain is typically 86 dB. Thanks to the capacitive coupling, no slow DC feedback loop is needed enabling a fast turn on time. IF2DEC has to be decoupled with at least 2.2 nF. Figure 17. Input of the IF2 Amplifier Schematic F2 F1 10 nF 10 nF ~ F1 ~ F2 40 kHz or higher global response Filter gain Frequency 1900 Ω IF2IN IF2DEC |
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