AMIS-53000 Datasheet, PDF (20/99 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53000 Frequency Agile Transceiver
Data Sheet
Figure 9: Receiver LNA Output Inductor Selection
5.2.2. IF Filter
A passive poly-phase filter and active filtering are used in the AMIS-53000 for frequency selectivity and rejection of the image
frequency. It is designed to provide an optimal image rejection of 50dB at 500kHz.
5.2.3. Data Filter
The OOK low-pass data filter is used for additional post-detection signal filtering in accordance with the OOK signal data rate (1.2, 1.8,
2.4, 4.8, 7.2, 9.6, 14.4, 19.2kHz). The RSSI buffer is used to drive the RSSI signal off chip for external monitoring, and can also be
internally configured for monitoring other signals such as the analog temp sense voltage or bandgap voltage.
5.3 Transmitter
The AMIS-53000 transmitter is a two-stage output amplifier. When both stages are selected, the highest output power at frequencies
from 300MHz to 928MHz is +15dBm. When only one stage is used, the AMIS-53000 can output up to 0dBm with better power
efficiency than when outputting the same power level with both stages. The voltage output level on the RFPWR pin controls the RF
output power level of the AMIS-53000. A DC connection must be made between the RFOUT pin and the RFPWR pin. The non-linear
output of the AMIS-53000 may require external components to match to a load and to reduce the spurious harmonics.
The output impedance of the AMIS-53000 can be matched to the impedance of an external load, using the spreadsheet AMIS-
53RFMATCH.xls provided by AMIS. This spreadsheet is explained in the application note, AMIS-52X00 Antenna Impedance Matching
Considerations. The goal of the transmit output matching with this spreadsheet is to optimize the output power while reducing the
harmonic power.
AMI Semiconductor – Aug. 05, Rev. 1.0
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