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I have been tasked to investigate the impedance matching on a product of ours, that uses a CC1070 transmitter IC.
I need some information / confirmation on the setup to measure the impedance looking into the CC1070 matching network from the antenna side.
I have in the past successfully analysed a CC1101 design, where the CC1101, being a transceiver, was put into RX mode. A network analyser confirmed a 50 ohm input impedance into the balun, as per the reference design.
Being a transmitter, how does the CC1070 need to be configured, in order to make a measurement using a network analyser?
I am assuming that the device also needs to be powered, configured for transmit (In my case it is asynchronous OOK at 433MHz) with the RF data input line tied low, so as to ensure that no carrier is transmitted.
I would recommend to do it the other way around: Remove the CC1070 and measure the impedance seen from the RF_OUT pin with the antenna connector terminated with 50 ohm. Then the impedance should be close to 91+j16 as stated in table 3 in the CC1070 datasheet.
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In reply to TER:
That is a great idea! I'll do just that. Thankyou!
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