The present invention provides an
noise suppression circuit comprises an internal circuit which has a high and a low level terminals. The low level terminal is connected to a low level power supply (GND) line. The
noise suppression circuit further comprises a first
transistor in which one main
electrode is connected to the high level terminal of the circuit, a bypass
capacitor connected between the other main
electrode of the first
transistor and the low level power supply line, and a second
transistor connected between the other main
electrode of the first transistor and a high level power supply (VDD) line. The first transistor is conductive when the internal circuit is active, and is not conductive when the internal circuit is inactive. The second transistor is not conductive when the internal circuit is active, and is conductive when the internal circuit is inactive. Moreover, a communication circuit for setting the number of data buses to be newly added to be less than two times a transmission data, then encoding the data to be sent so as to make the numbers of "0" and "1" in the data to be sent through the data buses equal to each other and accordingly reducing the increase of the number of the data buses to a minimum and thereby suppressing the common phase power supply
noise is provided. A communication apparatus comprising the communication circuit is also provided. Furthermore, the bypass
capacitor C for
noise suppression circuit is formed in an empty space in a ASIC. A polysilicon layer constituting one electrode of the bypass
capacitor is formed in the substrate
contact region formed between basic cells regularly arranged, each including a plurality of nMOS and pMOS transistors. This bypass capacitor C is connected between the high and the low level power supply lines to reduce the current running through the power supply line to suppress the EMI noise.