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ATA5824 Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATA5824 Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 98 page 11 4829C–RKE–09/05 ATA5823/ATA5824 A low-IF architecture is also less sensitive to second-order intermodulation (IIP2) than direct conversion receivers where every pulse or amplitude modulated signal (especially the signals from TDMA systems like GSM) demodulates to the receiving signal band at second-order non-linearities. 7.2 Input Matching at RF_IN The measured input impedances as well as the values of a parallel equivalent circuit of these impedances can be seen in Table 7-1. The highest sensitivity is achieved with power matching of these impedances to the source impedance of 50 Ω. The matching of the LNA Input to 50 Ω was done with the circuit according to Figure 7-1 and with the values of the matching elements given in Table 7-2. The reflection coefficients were always ≤ –10 dB. Note that value changes of C 1 and L1 may be necessary to compensate individual board layout parasitics. The measured typical FSK and ASK Manchester code sensitivities with a Bit Error Rate (BER) of 10 -3 are shown in Table 7-3 on page 12 and Table 7-4 on page 12. These measurements were done with multilayer inductors having quality factors according to Table 7-2, resulting in estimated matching losses of 0.8 dB at 315 MHz, 0.8 dB at 433.92 MHz and 0.7 dB at 868.3 MHz. These losses can be estimated when calculating the parallel equiva- lent resistance of the inductor with R loss = 2 × π × f × L × QL and the matching loss with 10 log(1+R In_p/Rloss). With an ideal inductor, for example, the sensitivity at 433.92 MHz/FSK/20 kBaud/ ±19.5 kHz/Manchester can be improved from –105.5 dBm to –106.7 dBm. The sensitivity also depends on the values in the registers of the control logic which examines the incoming data stream. The examination limits must be programmed in control registers 5 and 6. The measure- ments in Table 7-3 and Table 7-4 on page 12 are based on the values of registers 5 and 6 according to Table 14-3 on page 60. Figure 7-1. Input Matching to 50 Ω Table 7-1. Measured Input Impedances of the RF_IN Pin f RF/MHz Z In(RF_IN) R In_p//CIn_p 315 (44-j233) Ω 1278 Ω//2.1 pF 433.92 (32-j169) Ω 925 Ω//2.1 pF 868.3 (21-j78) Ω 311 Ω//2.2 pF ATA5823/ATA5824 RF_IN 4 C 1 L 1 |
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