Patent ID: 7852122

Claim:
A transmission circuit, which transmits a differential signal having pulse time larger than a predetermined minimum pulse time, comprising: a driving unit for feeding the differential signal as a potential difference between two transmission lines; and a driven unit for receiving the differential signal by the potential difference between the two transmission lines and operating on the basis of the differential signal, wherein said driving unit comprises: two driving unit NMOS transistors each of which is provided to correspond to one of the two transmission lines and outputs a drain voltage to the corresponding transmission line; and a first current source NMOS transistor, wherein a drain terminal of the first current source NMOS transistor is connected to source terminals of the driving unit NMOS transistors, and a source terminal of the first current source NMOS transistor is supplied with a predetermined voltage, and said driven unit comprises: two driven unit NMOS transistors each of which is provided to correspond to one of the two transmission lines and receives potential of the corresponding transmission line through its gate terminal; and a second current source NMOS transistor, wherein a drain terminal of the second current source NMOS transistor is connected to source terminals of the driven unit NMOS transistors, and a source terminal of the second current source NMOS transistor is supplied with the predetermined voltage.