Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Liquid formulations of carboxamide arthropodicides
Light-emitting device with a spacer at bottom surface
Thin film transistor and flat panel display device including the same
Method and apparatus for variable accuracy inter-picture timing specification for digital video encoding
Image forming apparatus to automatically select a communication condition
Buffering stop structure and corresponding packing case
Myoglobin blooming agents, films, packages and methods for packaging
  Randomly Featured Patents
Display apparatus
Medical clip
Blends of polyetherimides with polyesters of 2,6-naphthalenedicarboxylic acid
Marine spill containment method and apparatus
Therapeutic agents useful for treating pain
Conveyor wheel sliding system
High-tension connector box
Program control system for portable data storage device
Tension bearing connector
Glue chipped glass and method