Weighted addition circuit

摘要

A weighted addition circuit contains a plurality of resistances, each of which is connected to a common output at one terminal and to different input voltages at the other terminal. The voltage at the common output terminal is a balance voltage of the input resistances. The common output terminal is connected to an amplifier having an odd number of stages of inverters and a feedback resistance connecting the output of the last inverter stage to the input of the first inverter stage. Grounded low pass capacitors and/or balance resistors are also be included in the amplifier to improve the stability of the circuit and prevent undesirable oscillation. Providing a circuit containing a balance voltage of the parallel-connected input resistances allows for precise weighted addition of any number of inputs while still maintaining a small and simple circuit structure.