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
Virtual links in a routed ethernet mesh network
Methods, systems, and computer program product for virtually modifying surface region curvature to detect protrusions
Data communication system, data transmitting apparatus, data transmitting method, and method for determining packet size and redundancy
Mono-body defibrillation probe
Configuration and incentive in event management environment providing an automated segmentation of consideration
Liquid crystal display apparatus
  Randomly Featured Patents
Human powered piezoelectric power generating device
Real time seismic telemetry system
Roll `n` tone
Production of pigments
Toner for developing electrostatic image
Chrysanthemum plant named `Mega Time Yellow`
Catheter with thin film electrodes and method for making same
Clock spring connector
Vending machine dispensing system