Slice circuit capable of accurate conversion of an analog signal to a digital signal

A slice circuit receiving an input signal prepared by demodulating a received signal subjected to frequency modulation and having a voltage level corresponding to the frequency modulation, and converting the input signal received from an analog signal to a digital signal, comprising:

• a signal processing circuit producing, based on the input signal, one of a first processing signal including a first main signal and a first reference signal, a second processing signal including a second main signal and a second reference signal, and a third processing signal including the first main signal and the second reference signal;
• and
• a comparator comparing
• voltage levels of the first main signal and the first reference signal to provide a digital signal having a voltage level corresponding to the comparing when receiving the first processing signal,
• voltage levels of second main signal and the second reference signal to provide a digital signal having a voltage level corresponding to results of the comparing when receiving the second processing signal, and
• the voltage levels of the first main signal and the second reference signal to provide a digital signal having a voltage level corresponding to results of the comparing when receiving the third processing signal, wherein
• the first main signal is a signal having an amplified high frequency component of at least a predetermined frequency and a DC component including a predetermined voltage level, or is a signal having the high frequency component and a DC component at a voltage level changing in accordance with the DC component in the input signal,
• the second main signal is a signal having the high frequency component and a DC component the same as the DC component in the input signal,
• the first reference signal is a signal having an average voltage obtained by smoothing the input signal, and
• the second reference signal is a signal at a voltage level lower than the average voltage.