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发明授权
CN1909364B BTL方式的放大电路 有权

BTL方式的放大电路
摘要：
本发明提供一种BTL方式的放大电路，具备第1运算放大电路，输出与输入到信号输入端子的输入信号同相的输出信号；第2运算放大电路，输出与所述输入信号反相的输出信号；分压电路，产生所述输入信号的中间电压；第1电阻元件，连接于所述第1运算放大电路的输出端子与反相输入端子之间；第2电阻元件和第3电阻元件，串联连接于所述第1运算放大电路的反相输入端子与第2运算放大电路的反相输入端子之间；第4电阻元件，连接于所述第2运算放大电路的输出端子与反相输入端子之间；和阻抗变换电路，连接于所述分压电路的中间电压节点与所述第2电阻元件和第3电阻元件的串联连接节点之间。
摘要（英）：

The invention provides an amplifier circuit of BTL system comprises a first operational amplifier 1 delivering an output signal which is in-phase with a signal inputted to a signal input terminal 11,a second operational amplifier 2 delivering an output signal having a phase reverse to that of the input signal, a voltage division circuit 14 generating the intermediate voltage of an input signal afirst resistive element R1 connected between the output terminal and the reverse phase input terminal of the first operational amplifier, a second resistive element R2 and a third resistive element R3connected in series between the reverse phase input terminal of the first operational amplifier and the reverse phase input terminal of the second operational amplifier, a fourth resistive element R4connected between the output terminal and the reverse phase input terminal of the second operational amplifier, and an impedance conversion circuit 3 connected between the intermediate voltage node of a voltage division circuit and the series connection node the second and third resistive elements.

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