Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Radio apparatus having first and second amplifiers and which performs direct current offset correction of the first and second amplifiers










Image Number 5 for United States Patent #8489030.

A radio apparatus capable of correcting a direct current offset with high accuracy in a short time is provided. A radio apparatus according to an embodiment includes a first amplifier amplifying a signal inputted to an input terminal with amplification gain determined by a variable resistor to generate a first amplified signal, and a second amplifier amplifying the first amplified signal to generate a second amplified signal. Further, the radio apparatus includes a first correcting unit correcting a direct current offset of the first amplifier, and a second correcting unit correcting a direct current offset of the second amplifier. The radio apparatus also includes a reference voltage source or reference current source supplying a reference voltage or reference current for referring a direct current offset to the first amplifier and the second amplifier, a gain controller controlling the amplification gain of the first amplifier; and a correction controller controlling the gain controller to set the amplification gain to maximum and controlling the first and second correcting units to perform correction of the second correcting unit based on the second amplified signal obtained by inputting the reference voltage or the reference current to an input terminal of the second amplifier, and thereafter perform correction of the first correcting unit based on the second amplified signal obtained by inputting the reference voltage or the reference current to an input terminal of the first amplifier.








 
 
  Recently Added Patents
Mobile terminal and controlling method thereof
Navigation device, navigation method, and navigation program
Electronic component, a semiconductor wafer and a method for producing an electronic component
Polyureas made from aminocrotonates and enaminones
Temporal document trainer and method
Coated article and method for making the same
Method and a system for registering a 3D pre-acquired image coordinates system with a medical positioning system coordinate system and with a 2D image coordinate system
  Randomly Featured Patents
Fermemtation process for the high level production of bovine growth hormone
Illumination device with LED with a self-supporting grid containing luminescent material and method of making the self-supporting grid
Door facing
Monitoring several distributed resource elements as a resource pool
Method for the sorption of gaseous contaminants by means of nanostructured sorbers in the form of a fiber
Diode with lead terminal for solar cell
Portable ski carrier
Pivoted jaw pipe wrench of the three-arm lever type
Chlorination of hydroquinone
Chemical vapor deposition of chalcogenide materials via alternating layers