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
Cabinet door with tread pattern
Methods of saccharification of polysaccharides in plants
Reduction of HMF ethers with metal catalyst
Methods of preventing and treating viral infections by inhibiting the deISGylation activity of OTU domain-containing viral proteins
Inhibitor of casein kinase 1delta and casein kinase 1E
Crowd validated internet document witnessing system
  Randomly Featured Patents
Semiconductor optical sensors
Closure for a container
Cable semiconducting shields
Digital file distribution in a social network system
Method for reducing the amount of needed memory in a TDM switch system
Lightwave distance measuring apparatus and method
Card-holding device in a card-processing apparatus
Image forming apparatus, image forming method and image forming program
Fuel injection
Engine idling duration control