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
Preserving privacy of digital communication information
Audio/video program-related hyperlink printer
Signal transfer apparatus
Double patterning method using tilt-angle deposition
Method for playing digital media files with a digital media player using a plurality of playlists
Lubricant supplying device, process cartridge, and image forming apparatus
Remedy for overactive bladder comprising acetic acid anilide derivative as the active ingredient
  Randomly Featured Patents
Method of manufacturing of spark plug cap with ignition voltage detective capacitor
Suture anchor
Echo planar imaging using 180 degrees pulses
Zoom optical system with a prescribed conjugate distance
Brush holder
Isolated nucleic acid molecules coding for tumor rejection antigen precursor dage and uses thereof.
Preservation and formulation of bioactive materials for storage and delivery in hydrophobic carriers
Foldable bicycle
Unconditional frequency compensation technique on-chip low dropout voltage regulator
Zoom lens, and camera and portable information terminal for utilizing zoom lens