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CC1010-RTR1 Folha de dados(PDF) 128 Page - Texas Instruments |
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CC1010-RTR1 Folha de dados(HTML) 128 Page - Texas Instruments |
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128 / 152 page  CC1010 SWRS047 Page 128 of 152 17.22 Optional LC Filter An optional low-pass LC filter may be added between the antenna and the matching network in certain applications. The filter will reduce the emission of harmonics and increase the receiver selectivity. The filter topology is shown in Figure 44. Component values are given in Table 38. The filter is designed for 50 Ω terminations. The component values may have to be tuned to compensate for layout parasitics. The design equations for a 3dB equal ripple filter are: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ⋅ ⋅ ≈ 1333 . 0 1 1 2 RF C f π ω C L ω 6 . 35 = , C C ω 067 . 0 = where ωc is the cut-off frequency and fRF is the transmitted RF frequency. L71 C71 C72 L71 C71 C72 Figure 44. LC Filter Item 315 MHz 434 MHz 869 MHz 915 MHz C71 30 pF 20 pF 10 pF 10 pF C72 30 pF 20 pF 10 pF 10 pF L71 15 nH 12 nH 5.6 nH 4.7 nH Table 38. LC Filter component values |
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