Many sensors output a voltage waveform.
Thus no signal conditioning circuitry is needed to perform the conversion to a voltage. However, dynamic range modification, impedance transformation, and bandwidth reduction may all be necessary in the signal conditioning system depending on the amplitude and bandwidth of the signal and the impedance of the sensor. The circuits discussed in this section and in subsequent sections are treated as building blocks of a human-computer input system. Their defining equations for their operation are given without proof. For a more detailed description of how they work, see Design with Operational Amplifiers and Analog Integrated Circuits , Franco 1988 or The Art of Electronics , Horowitz and Hill 1989.