Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Transducer displacement protection
Non-transitory computer readable recording medium storing print management program, print management device, print management method, and print system
Optical power measurement method, optical line terminal and optical network unit
Apparatus for focus beam analysis of high power lasers
Eyeglasses
Polarity switching member of dot inversion system
Organic light-emitting display and method of manufacturing the same
  Randomly Featured Patents
Bonded composite intake manifold
Direct conversion receiver with tri-phase architecture
Air conditioner for a vehicle having learing function and control method
Mobile electronic device
Combined astragal extrusion and seal
Instant messaging object store
System and method for integrated delivery of media and synchronized transcription
Shaken idiophone
Implantable prosthesis having textured bearing surfaces
Device for organic neutralization and removal of phosphorus compounds present in water basins