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
Coordinated multi-point transmission in a cellular network
Onium salt-containing polymer
Grid computing accounting and statistics management system
Touch screen guitar
Link establishment in a wireless communication environment
Temporary protective cover for an exposed junction box
Recombinant negative strand virus RNA expression systems and vaccines
  Randomly Featured Patents
Method and system for producing multiple images in a single image plane using diffraction
Electronic device having a light emitting/detecting display screen
Downhole tool with sliding valve
Apparatus for producing a three-dimensional object
Shutter assembly
Optical cross connect employing a curved optical component
Data processor
Free-size cap
Shaving razor package
Anti-snoring collar