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
Transmitter and receiver for streaming media including packet padding
Method and apparatus for accessing and downloading information from the internet
Connector with shielding device and method for manufacturing connector
Methods and systems for dynamic spectrum arbitrage
Email certificates
Fuse part in semiconductor device and method for forming the same
Method and apparatus for a cryptographically assisted commercial network system designed to facilitate buyer-driven conditional purchase offers
  Randomly Featured Patents
Generating device having magneto generator
Syringe safety device
Insulation displacing terminal with cantilever spring contact members
Apparatus for preventing heat damage in an electromagnetic clutch
Method and apparatus for reconstructing and acoustic field
Monitoring distortion of a spinning mirror
Purification of aluminum chloride
Image display device and method of driving the same
Printing apparatus and method
Removal of bacterial endotoxin in a protein solution by immobilized metal affinity chromatography