Test setup Conditions of LMS6002D TxPLL frequency 2140 MHz TxLPF 5 MHz TxVGA1 -10 dB TxVGA2 25 dB RxPLL frequency 2137 MHz TxLPF 5 MHz Active LNA LNA2 RxVGA2 30 dB RxVGA1 120 Internal RF Loopback to LNA2 path.
Reset the transceiver. Enable Tx and Rx path. Set TxLPF and RX LPF to 5 MHz. Set Tx frequency to f MHz (2.14GHz in this example) Set Rx frequency to f - 3 MHz (2.137GHz in this example). Enable loopback mode on LNA #2. Set relevant Tx and Rx VGA gains: • TxVGA1 set to -10 dB. • TxVGA2 set to 25 dB. • RxVGA1 set to 120. • RxVGA2 set to 30 dB. 7. Open RXOUT switch. 8. Send 0x000 to DACs. 9. Execute Tx path and RX path auto-calibration sequence to remove DC offset. 10. Apply 1 MHz digital CW tone to DACs. 11. Tune Tx LOFT by minimizing 3 MHz signal in the Rx DFT spectrum. 12. Tune Tx IQ BB phase and gain correction values to minimize TX SSB signal at 2 MHz. 13. Enable the averaging filter in BB to minimize remaining receiver DC offset component. 14. Tune Rx IQ BB phase and gain to minimize RX SSB signal at -4 MHz. 15. Save all calibration values.
Red Curve Measured SSB with analyzer. Best SSB level achieved below -70 dBc Blue Curve Measured SSB via digital interface. Samples are collected with DIO card on PC. DFT length is 7180 samples. Best SSB level achieved below -55 dBc. Green Curve Measured SSB via digital interface. Samples are collected with DIO card on PC. DFT length is 7180 samples. The average function is enabled (10 times). Best SSB level achieved below -65 dBc.
Red Curve Measured SSB with analyzer. Best SSB level achieved below -70 dBc Blue Curve Measured SSB via digital interface. Samples are collected with DIO card on PC. DFT length is 7180 samples. Best SSB level achieved below -60 dBc. Green Curve Measured SSB via digital interface. Samples are collected with DIO card on PC. DFT length is 7180 samples. The average function is enabled (10 times). Best SSB level achieved below -65 dBc.
Gain error correction block Software in baseband initially applies course gain variation on the I or Q channel and measures the loop back signal via the LMS6002D receiver to measure the optimum value. The example block for gain correction is shown below:
Phase error correction block The baseband S/W applies a course phase multiplier on the I or Q channel and measures the loop back signal via the LMS6002D receiver to measure the optimum value. The process is then repeated using a finer control step to ascertain the optimum phase and gain offset value to be applied. The example block for gain correction is shown below:
25 dB. RxPLL frequency 2137 MHz. TxLPF. 5 MHz. Active LNA. LNA2. RxVGA2. 30 dB. RxVGA1. 120. Internal RF Loopback to LNA2 path. Digital IQ interface running at. 30.72 MHz. 1MHz CW signal is generated by. DIO card. Data fed to Tx DAC's. Tx and Rx I/Q imbalance calibration done from PC via digital interface.
Default RxVGA2 DC offset calibration method gives unstable calibration results. ⢠The noise, which is introduced in every VGA2 gain stage (Stage A and Stage ...
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