Patent ID: 7141865

Claim:
A low noise semiconductor device comprising: a first region doped with impurities yielding charge carriers having a first polarity, said first region having a first region electrode operatively collected to the ground; a second region doped with impurities yielding charge carriers having a second polarity, said second polarity being opposite said first polarity, said second region being operatively connected to said first region, said second region having a second region electrode operatively arranged to input a first signal; a third region doped with impurities yielding charge carriers having said second polarity, said doping and said carrier density in said third region being substantially greater than said doping and said carrier density, respectively, in said second region, said third region being operatively connected to said second region; a fourth region doped with impurities yielding charge carriers having said first polarity, said fourth region having a fourth region electrode operatively connected to a biasing voltage, said fourth region electrode operatively outputting a second signal, said fourth region being operatively connected to said third region; a capacitor having a first capacitor electrode operatively connected to said third region and a second capacitor electrode operatively grounded.