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










Image Number 8 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
Stacked labyrinth chambers for use with an electrical submersible pump
Closure cap comprising a seal gasket
Storage system comprising plurality of storage system modules
System and method for providing a market-backed annuity with variable segment terms and automatic rollover
Nasal dilator and methods of fabricating medical devices
Information processing apparatus, method, and computer-readable medium
Living radical polymerization method
  Randomly Featured Patents
Gelatin-grafted-polymer particles as peptizer for silver halide emulsions
Support base for use on decked surfaces
Premium synthetic lubricants
Multiple compartment storage and dispensing apparatus
Electronic apparatus which inhibits control of certain objects during initialization processing
Watch
Guide sleeve for a length-adjustable column for chairs or tables
Shaft alignment methodologies
Sulfonyloxyphenylurea compounds and herbicidal compositions
Blanks for phase shift photomasks, and phase shift photomasks