| 摘要 |
The present invention relates to a filter circuit and more particularly to an improved technique for arranging electronic components in a filter. The invention is a filter which uses one or more piezo-crystal devices (680) linked to a differential amplifier (500). The transfer function of the filter is tuned by the arrangement of capacitors, resistors, and inductors, between the signal input (640) and the positive input (540) and the negative input (520) of the amplifier (500), as well as by the arrangement of the resistors, capacitors, and inductors in the negative feedback path. The resistors, capacitors, and inductors to achieve a desired transfer function can be determined by calculation utilizing the transfer function equation. The stray capacitance neutralizing filter circuit can be used in a communication or signaling system. |
