Signal transmission circuit device, semiconductor device, method and apparatus for inspecting semiconductor device, signal transmission device, and motor drive apparatus using signal transmission device

摘要

Disclosed is a signal transmission circuit device (200) including a feedback signal transmission unit (210) that feeds back a control output signal (Sout) as a feedback signal (Sf) to an input side circuit (200A). A logical comparison circuit (212) detects “mismatch” between input and output by performing logical comparison between a control input signal (Sin) and the feedback signal (Sf). When a state of “mismatch” between input and output occurs, a first pulse generating circuit (202) or a second pulse generating circuit (204) outputs a first correction signal (Sa1) or a second correction signal (Sa2) corresponding to a potential (high level or low level) of the control input signal (Sin), and corrects the control output signal (Sout) to the same potential (high level or low level) as the control input signal (Sin). With such configuration, the mismatch between input and output can be automatically corrected.

主权项

1. A signal transmission circuit device for transmitting signals between an input side circuit and an output side circuit, comprising:
a first pulse generating circuit that receives a control input signal input to the input side circuit and outputs a first correction signal; a second pulse generating circuit that receives the control input signal and outputs a second correction signal; an input signal transmission unit that receives the first correction signal and the second correction signal, and transmits a signal from the input side circuit to the output side circuit; an input signal restoration circuit that receives an output signal of the input signal transmission unit and outputs a control output signal equivalent to the control input signal; a feedback signal transmission unit that receives the control output signal, transmits a signal from the output side circuit to the input side circuit, and outputs a feedback signal; and a logical comparison circuit that receives the control input signal and the feedback signal, performs logical comparison between the control input signal and the feedback signal, and outputs a logical comparison signal, wherein the first pulse generating circuit receives the logical comparison signal together with the control input signal, and outputs the first correction signal when the control input signal and the logical comparison signal become a first combination, and the second pulse generating circuit receives the logical comparison signal together with the control input signal, and outputs the second correction signal when the control input signal and the logical comparison signal become a second combination different from the first combination, wherein each of the input signal transmission unit and the feedback signal transmission unit includes at least one isolator that is a transformer, and wherein the input side circuit, the output side circuit, and the transformer are formed on different semiconductor substrates, respectively.