Resources Contact Us Home
Method and apparatus to compensate AM-PM delay mismatch in envelope restoration transmitter

Image Number 6 for United States Patent #7453927.

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.

  Recently Added Patents
Reliability fire pressure switch
Non-aqueous solution process for the preparation of cross-linked polymers
Touch panel structure and manufacturing method thereof
Cooling structure for electronic device
Method and apparatus for performing real time anomaly detection
Pet grooming brush and vacuum attachment
Method for eliciting an immune response to human telomerase reverse transcriptase
  Randomly Featured Patents
Method for making single transistor non-volatile electrically alterable semiconductor memory device
Ride-on toy
Surface-functionalized biocidal polymers
Device for the excitation of waves and especially ultrasonic waves including a cell
Electrical circuits with button plated contacts and assembly methods
Phenyloxazolidinones having a c-c bond to 4-8 membered heterocyclic rings
Game ball
Low inertia apparatus and method for accumulating and applying tension to webs
Disposable liquid supply kit for use in an endoscope