Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and apparatus for amplifying a signal










Image Number 11 for United States Patent #5673001.

A unique method and apparatus modifies the load impedance at the output of a power amplifier by varying a voltage variable capacitor (VVC) (310) to maximize the efficiency of the power amplifier (304). A comparator (509) generates amplifier control signal (211) based upon a detected power output signal (216) and a reference signal. In addition to providing power control, the control signal is also coupled to a VVC circuit (506) to control the output impedance of the power amplifier. In an alternate embodiment, a separate VVC control signal (527) based upon a comparison of the power control signal and the battery voltage is coupled to a VVC. In another alternate embodiment, a second VVC can be coupled in parallel to the first VVC. The second VVC is preferably controlled by a signal (805) based upon the current in the power amplifier. Finally, an alternate embodiment incorporates a VVC circuit (506) at the input of the power amplifier to compensate for variations in input impedance to improve other power amplifier parameters such as IM, gain, output power and noise level.








 
 
  Recently Added Patents
Architectural panel with bamboo rings light density embossed surface
Medical capsule housing formed by thermal welding
High purity diphenyl sulfone, preparation and use thereof for the preparation of a poly(aryletherketone)
Method and CTDevice for computer tomographic spiral scanning of a patient
Method and apparatus for policy-based network access control with arbitrary network access control frameworks
Sulfonated amorphous carbon, process for producing the same and use thereof
Stable light source device
  Randomly Featured Patents
Customizable indicator light
Collated nails having tape recesses
Robust catheter tubing
Method for treating vasospastic cardiovascular diseases heterocyclic amide derivatives
Acyl capped quinone-coupled polyphenylene oxides
Fiber optics differential pressure transducer
Method and apparatus for the automatic analysis of the concentration of an individual component of a fluid in a metal-depositing bath having several components
Rotary grinder method and apparatus
Self-erecting end-load top-dispensing container
Method and apparatus for volume scoring calcification concentrations of a CT scan