Method and apparatus to compensate AM-PM delay mismatch in envelope restoration transmitter
A technology of transmitters and transceivers, applied in the parts, electrical components, transmission systems, etc. of amplifying devices, can solve problems such as transmission time difference sensitivity, and achieve the effect of optimizing performance
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[0026] As mentioned above, the presence of delay mismatch in the AM and PM signal chains of the ER transmitter can reduce ACLR and EVM performance. According to an aspect of the present invention, the effect of the delay mismatch is detected using the receiver after the TX signal loops back to the receiver. In this way, the effect of the delay mismatch is detectable using the existing RX measurement function, avoiding additional circuitry, cost and complexity.
[0027] FIG. 2 is a block diagram of the ER RF transceiver of the mobile station 10 according to the present invention. The receiver (RX) 14 is used to adjust the AM and PM path delays of the transmitter (TX) 12. As used herein, the term "mobile station" can include cellular radio telephones with or without multi-row displays; personal communication system (PCS) terminals that can combine cellular radio telephones with data processing, fax, and data communication capabilities; can include Wireless phones, pagers, Internet / I...
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