PURPOSE: To provide a sine wave oscillating circuit capable of easily generating a sine wave by combination of a smaller number of kinds of parts and capable of being formed as one body on a semiconductor substrate. ;CONSTITUTION: Two inverter logic circuits 10 and 14 and one LC element 12 are included to constitute a sine wave oscillating circuit 1. The LC element 12 includes first and second spiral electrodes, which are formed approximately in parallel like concentric circles on the semiconductor substrate, and a spiral pn junction layer which has the p area and the n area connected to these electrodes respectively, and each electrode functions as an inductor conductor, and a capacitor like a distributed constant due to the pn junction layer is formed between them. The output of the inverter logic circuit 10 is fed back to the input side through one spiral electrode and the output of the inverter logic circuit 14 is inputted to the other spiral electrode to oscillate a sine wave. Each of components can be formed on the semiconductor substrate, and the whole of them can be formed as one body.;COPYRIGHT: (C)1996,JPO
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