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
Adaptive period network session reservation
White light emitting lamp and white LED lighting apparatus including the same
Printing apparatus having extendable functionality and method thereof
Polymers derived from benzobis(silolothiophene) and their use as organic semiconductors
Combination of the application of antibodies for immunostimulation together with glucocorticoids
Display fixture for highlighting products
Method and apparatus for supporting HARQ
  Randomly Featured Patents
Ileal reservoir device
Synchronization control capable of establishing synchronization without transmission of distance information between control and local earth stations
Post mount
Agricultural header transport kit
Epithermal neutron detector
Alignment hanger and method for building a barrier of concrete blocks
Error correction apparatus
Curable compositions and process
Combined watch and bracelet
Device for attaching the extremity of a link to an object, particularly a watch