Resources Contact Us Home
Low noise active mixer

Image Number 2 for United States Patent #5379457.

In a conventional Gilbert-cell active mixer, two local oscillator matched pairs of transistors receive a local oscillator input signal and are coupled to a radio frequency matched pair of transistors which receive a radio frequency input signal. The circuit generates an intermodulated output signal at the collectors of the local oscillator matched pairs. Noise degradation is reduced over the conventional mixer by replacing the standard radio frequency emitter degeneration resistor with a reactive element, thereby reducing thermal noise. Narrow-band input matching is achieved by insertion of a series inductive element and optional parallel capacitive element in line with the radio frequency input. Thermal noise contributed to the circuit is thereby minimized while circuit linearity is preserved in the narrow frequency band of interest.

  Recently Added Patents
Method of manufacturing semiconductor device
Systems and methods for documenting medical findings of a physical examination
Method and apparatus for allocating and obtaining IP address
Peptide vectors
Communication system and data transmission method thereof
Method of driving stereoscopic display apparatus and stereoscopic display apparatus
Adjustable box extender
  Randomly Featured Patents
Method and apparatus for displaying information with a head-up display
Compositions and methods for imparting odor resistance and articles thereof
Oil catching boom
Extension for a trimmer
Medicine cabinet
Method for ladle treatment of molten cast iron using sheathed magnesium wire
Tire pressure monitor system tool with parts number database
Position measuring instrument
Method and apparatus for light to frequency conversion
Electrically conductive bricks