公开(公告)号：US06577187B1

公开(公告)日：2003-06-10

申请号：US09594664

申请日：2000-06-15

申请人： Matthew M. Lesko

发明人： Matthew M. Lesko

IPC分类号： H03F2100

CPC分类号： H03F3/45085 ,  H03F1/30 ,  H03F3/45475 ,  H03F3/45959 ,  H03F3/45991 ,  H03F2203/45371 ,  H03F2203/45591 ,  H03F2203/45688

摘要： A powered transducer preamplifier includes a preamplifier circuit that DC couples the preamplifier input with the preamplifier output. A biasing circuit is coupled to the preamplifier input to apply a bias voltage to power the transducer, and a DC level shifting circuit is DC coupled to the signal path of the preamplifier circuit between the input and the output to compensate for this bias voltage. The DC level shifting circuit avoids the use of reactive components, and thereby reduces phase distortion. A variety of DC level shifting circuits can be used, including a bridge circuit having four matched resistors and an inverter DC coupled between the nodes of the bridge.

摘要翻译： 一个供电的传感器前置放大器包括前置放大器电路，其将前置放大器输入端与前置放大器输出相耦合。 偏置电路耦合到前置放大器输入以施加偏置电压来为换能器供电，并且直流电平移位电路被直流耦合到输入和输出之间的前置放大器电路的信号路径，以补偿该偏置电压。 DC电平移位电路避免使用无功分量，从而减少相位失真。 可以使用各种DC电平移位电路，包括具有四个匹配电阻器的桥式电路和耦合在桥接器节点之间的逆变器DC。