<p>A quantizer-subtractor circuit is provided with a input circuit for inputting an input signal and a circuit for producing a digital signal corresponding to the input signal. The quantizer-subtractor circuit contains 2n transistors. These transistors are supplied with different bias voltages by a bias circuit. A control circuit is connected to the transistors and the input circuit and controls the currents passing through the 2n transistors. A circuit produces as a subtraction output a signal corresponding to the difference between the controlled currents passing through the transistors applied with the bias voltages having odd-ordered magnitudes and the currents flowing through the transistors applied having bias voltages with the even-ordered magnitudes.</p>
