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TH7122 with External PA and LNA
The output power and the sensitivity of TH7122x transceivers for SRD are enough for many applications. They can deliver up to 10dBm output power and have a sensitivity of up to -105dBm in FSK mode.
However, some parameters of the standard TH7122x EVB can be improved. The standard EVB does not have much RF selectivity, so the image rejection of the boards at high frequencies is low. In some cases the leakage from the receiver VCO to the input is also high. For some applications the customer needs a better sensitivity and a higher output power. The aim of this application note is to show how to improve these parameters. One PCB layout has been designed for both TH7122 and TH71221 transceivers. A summary of the measured results is shown below.
Current Revision:
001
File Type: Application Note
File Size: 1.0 MB
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