The invention relates to a
signal pre-
amplifier circuit of an
aerospace-grade photoelectric
encoder, belonging to a
signal amplifier circuit involved in the technical field of photoelectric encoders and aiming at solving the technical problem of providing the
signal amplifier circuit of the
aerospace-grade photoelectric
encoder. The technical scheme of the invention is that: the signal pre-amplifier circuit comprises a first to a third input resistors, a first to a third inverted input resistors, a
negative feedback resistor, a first to a fourth bias resistors and an amplifier; after the second positive input
resistor and the third positive input
resistor are connected in parallel, one end is grounded and the other end is connected with the first positive input resistor, and the other end of the first positive input resistor is connected with a positive input pin of the amplifier; after the second inverted input resistor and the third inverted input resistor are connected in parallel, one end is grounded and the other end is connected with the first inverted input resistor, and the other end of the first inverted input resistor is connected with the negative input pin of the amplifier; one end of the
negative feedback resistor is connected with an output pin of the amplifier, and the other end of the
negative feedback resistor is connected with the nvegative input pin of the amplifier; after the second bias resistor and the third bias resistor are connected in parallel, one end is connected with a
positive power supply V+, the other end is connected with the fourth bias resistor in series, and the other end of the fourth bias resistor is grounded; and one end of the first bias resistor is connected with the positive input pin of the amplifier, and the other end of the first bias resistor is connected with a connection point A of the second bias resistor, the third bias resistor and the fourth bias resistor.