Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Quadrature modulation apparatus, method, program, and recording medium










Image Number 5 for United States Patent #7944989.

An RF signal, which has been obtained by a quadrature modulation, is corrected without performing quadrature demodulation. There are included an in-phase multiplier, a quadrature multiplier, an adder, a power detector, and an error determining part. The in-phase multiplier outputs an in-phase conversion signal by mixing an in-phase local signal of a predetermined local frequency with an in-phase correction user signal obtained by adding an in-phase user signal to an in-phase correction signal of a sinusoidal voltage outputted from an in-phase correction signal output unit. The quadrature multiplier outputs a quadrature conversion signal by mixing a quadrature local signal, which is different in phase by 90 degrees from the in-phase local signal, with a quadrature correction user signal obtained by adding a quadrature user signal to a quadrature correction signal, which is different in phase by 90 degrees from the in-phase correction signal, from a quadrature correction signal output unit. The adder adds the in-phase conversion signal to the quadrature conversion signal. The power detector measures an output voltage of the adder. The error determining part determines, based on the measurement result of the power detector, the error of the quadrature modulation.








 
 
  Recently Added Patents
Perspective runway system
System and method for providing security in browser-based access to smart cards
Data processing method
Bioelectric battery for implantable device applications
Collaborative computing community role mapping system and method
Para-xylylene based microfilm elution devices
Engineered enzymes with methionine-gamma-lyase enzymes and pharmacological preparations thereof
  Randomly Featured Patents
Method for forming a transistor having gate dielectric protection and structure
Managing information about relationships in a social network via a social timeline
System and method for displaying market data in an electronic trading environment
Process for producing the antibiotic nosiheptide
Lightweight aggregate and process for its production
Composition suitable for use in the production of laser beam recording/reading means
Surge prevention control system for dynamic compressors
Substituted 2-aminothiochromones
Armored pipe connected to a steel lining of a prestressed cast pressure tank
Flash EEPROM array with P-tank insulated from substrate by deep N-tank