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
Methods and devices for enforcing network access control utilizing secure packet tagging
PCSK9 antagonists
Optical article including an antireflecting coating having antifog properties and process for making same
Aisle barrier
Digital broadcast receiver and method for processing caption thereof
Haloalky -substituted amides as insecticides and acaricides
Protection circuit, substrate for electro-optical device, electro-optical device, electrophoretic display device, electronic apparatus, and manufacturing method of electro-optical device
  Randomly Featured Patents
Exercise apparatus
Surround sound headphone system
Composite polyester films and their use as protective layers for photopolymer plates, and photopolymer plates comprising said films
Device for collecting heavy oil and transferring it to suitable container
Process for developing or peeling alkali-type photosensitive film and apparatus used therein
Support pedestals
Solid polymer electrolyte chlor-alkali electrolytic cell
High gain read circuit for 3D integrated pixel
Visualizing transaction traces as flows through a map of logical subsystems
Hearing protective device that includes cellular earmuffs