An analogue to digital converter using insulated gate field effect transistor integrated circuits

 Circuits for converting analogue currents and voltages into digital signals have become increasingly important, as more and more digital control and computation techniques are applied to industrial, commercial and military control systems. The reason for this growing trend, of course, lies in the advantages of digital control and computation circuits - advantages which include high accuracy and wide dynamic range. These digital techniques also have disadvantages in that they are not compatible with the analogue outputs of transducers and the input to controls. A logical alternative, therefore, might be the development of transducers having digital outputs and controllers having digital inputs. One of the objects of this investigation is to produce an analogue to digital converter of reasonable accuracy such that it may be economically feasible to have one for every transducer. Hence the reason for the use of insulated gate field effect transistors, where much More complex systems can be constructed on an integrated circuit for the same chip area as for a bipolar device.