This invention provides a semiconductor circuit which can fetch and store analog and multilevel data by using a simple circuit. This invention also provides a multilevel memory which can freely change the number of quantizing levels by using external signals. The semiconductor circuit comprises a first circuit which converts first signals into a group of quantized signals, a second circuit which converts the signal group into second multilevel signals, and means which feeds back the second signals to the first circuit as first signals. The semiconductor circuit further has a means which electrically separates at least one signal included in the signal group from the input of the second circuit, and a means which feeds back the second signals to the input of the second circuit instead of the signal separated.
