Renesas Technology Corp.

Takeshi Ooshita

Katsushi Asahina

Takuji Komeda

In a transmission signal correction circuit, a first output circuit outputs a data string to outside. A second output circuit for correction is connected in parallel with the first output circuit. The second output circuit receives the data string to add the data string to an output signal of the first output circuit during a period when a control signal is kept generated. A data string detection circuit generates the control signal when detecting a signal sequence, in the data string, that affects a transmission waveform.

Transmission signal correction circuit

An impedance control circuit includes a reference voltage output circuit for outputting one of a plurality of reference voltages; a variable resistor; a comparator and a control circuit. The comparator includes a first input terminal supplied with a reference voltage from the reference voltage output circuit and a second input terminal connected to the variable resistor, and compares the voltages at the first and second input terminals. The control circuit controls the variable resistor and establishes a plurality of impedances corresponding to the reference voltages in response to the signal output from the comparator. It enables the single impedance control circuit to control the plurality of different impedances on the semiconductor integrated circuit.

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Tokyo, Japan

Takeshi Ooshita