Patent ID: 8816772
Filing Date: 2014-08-26
Classification: H03F,H03G

Abstract:
1. A differential circuit, comprising: an amplifying stage including first to third units, a pair of load resistors, a current source, and a power supply; and a control stage including fourth and fifth units, wherein one of said load resistors, said second unit, said first unit, and said current source constitute a first current path between said power supply and a ground, and another of said load resistors, said third unit, said first unit, and said current source constitute a second current path between said power supply and said ground, wherein said second and third units each reduce a first current flowing in said first path and a second current flowing in said second path, respectively, wherein said fourth unit is connected to said second unit and said one of said load resistors to compensate said first current reduced by said second unit, and said fifth unit is connected to said third unit and said other load resistor to compensate said second current reduced by said third unit and, wherein said second and third units receive a control signal, and said fourth and fifth units receive a complementary control signal compementary to said control signal, said control signal determining reduction of said first and second currents by second and third units, respectively, said complementary control signal determining compensation of said first and second currents by said fourth and fifth units, respectively.