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ATA5824 Datasheet(PDF) 11 Page - ATMEL Corporation

Part # ATA5824
Description  UHF ASK/FSK Transceiver
Download  98 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA5824 Datasheet(HTML) 11 Page - ATMEL Corporation

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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
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)
1278
Ω//2.1 pF
433.92
(32-j169)
925
Ω//2.1 pF
868.3
(21-j78)
311
Ω//2.2 pF
ATA5823/ATA5824
RF_IN
4
C
1
L
1


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