Balance type differential amplifier
专利汇可以提供Balance type differential amplifier专利检索，专利查询，专利分析的服务。并且PURPOSE: To suppress the same phase noise component by connecting respective gates of a MOS FET for the first and second constant electric current sources connected commonly to respective sources of each pair of a differential input MOS FET of the first and second differential amplifier circuit to each drain of respective other differential inputs MOS FET.
CONSTITUTION: Respective gates of MOS FETs 35 and 45 for the constant electric current source of both differential amplifying circuits 30 and 40 are respectively connected to respective drains of respective differential inputs MOS FET 31 and 41, namely, connecting middle points A and B, an electric power source voltage VDD is supplied to an electric power source terminal 3, and the direct current voltages VA and VB of the connecting middle points A and B are supplied as a gate bias, an action point of the MOS FETs 35 and 45 is shifted to the vicinity of the border line of the unsaturated area and the saturated area, and the constant electric current characteristic is improved. Further, the balance input signal is mutually supplied to respective gates of the differential input MOS FET 31 and 41 by the reverse phase, and therefore, instantaneous voltages v
a and v
b of the connecting middle points A and B are also mutually changed by the reverse phase, supplied respectively to respective gates of MOS FETs 35 and 45, and the sum of electric currents iD
35 and iD
45 goes to be always constant. Thus, the same phase noise suppressing ratio is improved.
COPYRIGHT: (C)1986,JPO&Japio，下面是Balance type differential amplifier专利的具体信息内容。
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