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    • 7. 发明授权
    • Differential amplifier circuit giving reduced DC offset with unbalanced
source resistances
    • 差分放大器电路通过不平衡源极电阻降低DC偏移
    • US5485122A
    • 1996-01-16
    • US317850
    • 1994-10-04
    • Perry S. Lorenz
    • Perry S. Lorenz
    • H03G5/02H03G5/12H03F3/45
    • H03G5/025H03G5/12
    • A Voss-type electronic tone control circuit in which the output of an amplifier is connected to the circuit output. An input resistor interconnects the circuit input and the amplifier inverting input and a feedback resistor interconnects the amplifier output and inverting input. One end of a first resistor is switched between the circuit input and the amplifier output. A first capacitor is connected between the other end of the first resistor and ground. A second capacitor is connected between the other end of the first resistor and one end of a potentiometer, the other end of which is grounded. The potentiometer slider feeds the amplifier non-inverting input. The capacitance of the second capacitor is different from that of the first capacitor, which enables the resistance of the first resistor to be increased, and the resistance of the potentiometer to be reduced compared with a conventional circuit. Increasing the first resistor resistance reduces loading on the boost/cut switch. Decreasing potentiometer resistance reduces the avenge source resistance presented to the amplifier non-inverting input, and, hence, the source resistance imbalance between the inverting and non-inverting inputs. The effects of the remaining source resistance imbalance are mitigated by unbalancing the input currents of the amplifier. The base of an auxiliary input transistor is connected to the amplifier inverting input. The emitter of the auxiliary transistor is connected to the second current generator to increase the current drawn by the inverting input.
    • 一种Voss型电子音调控制电路,其中放大器的输出连接到电路输出。 输入电阻器将电路输入和放大器反相输入互连,反馈电阻将放大器输出和反相输入互连。 第一个电阻的一端在电路输入和放大器输出之间切换。 第一电容器连接在第一电阻器的另一端和地之间。 第二电容器连接在第一电阻器的另一端和电位计的另一端之间,另一端接地。 电位器滑块提供放大器非反相输入。 第二电容器的电容与第一电容器的电容不同,这使得能够增加第一电阻器的电阻,并且与常规电路相比电位器的电阻降低。 增加第一个电阻电阻会降低升压/切断开关的负载。 降低电位器电阻会降低放大器非反相输入端所产生的复仇源电阻,从而降低反相和非反相输入之间的源极电阻不平衡。 通过不平衡放大器的输入电流来减轻剩余源极电阻不平衡的影响。 辅助输入晶体管的基极连接到放大器反相输入。 辅助晶体管的发射极连接到第二电流发生器以增加由反相输入引起的电流。