Method and apparatus to compensate AM-PM delay mismatch in...

Details Method and apparatus to compensate AM-PM delay mismatch in... Method and apparatus to compensate AM-PM delay mismatch in...

2003-09-26

2008-11-18

Vo, Don N (Department: 2611)

Pulse or digital communications

Transceivers

C375S224000

Reexamination Certificate

active

07453927

ABSTRACT:
An RF transceiver includes an Envelope Restoration (ER) transmitter (TX) and a receiver (RX). A method includes providing the TX with a programmable delay element in at least one of an AM path and a PM path; making an RF connection between an output of the TX and an input of the RX; and when receiving a signal through the RF connection, determining a delay value for use in programming the programmable delay element. The method includes measuring an effect on a parameter of a delay mismatch between the AM path and the PM path for use in determining the delay value. Adjacent Channel Leakage Ratio (ACLR); Own-Channel Power (OCP) or Bit Error Ratio (BER) may be measured in this regard. When measuring ACLR, delay is adjusted to minimize ACLR; when measuring OCP, delay is adjusted to maximize OCP; and when measuring BER, delay is adjusted to minimize BER.

REFERENCES:
patent: 2002/0058486 (2002-05-01), Persson
patent: 2002/0082792 (2002-06-01), Bourde et al.
patent: 2002/0105378 (2002-08-01), Tapio
patent: 2002/0168020 (2002-11-01), Justice et al.
patent: 2003/0118143 (2003-06-01), Bellaouar et al.
patent: 2004/0219891 (2004-11-01), Hadjichristos
“Digital Multimode Technology Redefines the Nature of RF Transmission”, Applied Microwave & Wireless, Aug. 2001, 7 pages.

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