Patent ID: 8428155

Claim:
A printed circuit board comprising: a transmission circuit configured to transmit a signal; a receiving circuit configured to receive a signal; a main transmission line configured to connect the transmission circuit and the receiving circuit to each other and propagate a signal from the transmission circuit to the receiving circuit; a sub transmission line, one end thereof being connected to a connection point between the transmission circuit and the main transmission line, and an impedance value thereof being equal to or higher than a parallel impedance value of an output impedance value of the transmission circuit and an impedance value of the main transmission line; and a resistor connected to the other end of the sub transmission line, resistance thereof being lower than the impedance value of the sub transmission line, wherein the sub transmission line has a length which satisfies 0.5×Tr≦Td≦0.5×Tmin, where Td is a signal propagation time required to propagate the signal from the one end to the other end of the sub transmission line, Tmin is a minimum pulse width of the signal transmitted by the transmission circuit, and Tr is a rise time of the signal transmitted by the transmission circuit.