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
Circuit device for preventing radiation emission in portable terminal with two cameras
Backlight assembly, method for driving backlight assembly, and liquid crystal display having the same
Terminal device and image printing method
Sponge
Flexible quantization
Cake knife handle
Signal processing apparatus, display apparatus having the same, and signal processing method
  Randomly Featured Patents
Noninvasive genetic immunization, expression products therefrom, and uses thereof
Load control system for standard electric utility meter
Holder for eyeglasses
Cemented carbide with binder phase enriched surface zone
Measuring relative deflection of interspaced toothed wheels on a less than once per revolution basis
USB portable storage drive
Thermoplastic resin container for which completion of retort processing can be confirmed and method for producing the same
Serial nuclear transfer of ungulate embryos
Epoxy resin composition, prepreg and fiber-reinforced composite material
Aperture stop and manufacturing method thereof