Numerically-controlled oscillator capable of generating cosine signal and sine signal only using cosine look up table and operating method of the numerically-controlled oscillator
AssigneeElectronics and Telecommunications Research Institute
InventorsSeok SEO, Min Joung SHEEN, Gweon Do JO
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Abstract
A numerically-controlled oscillator (NCO) and an operating method of the NCO are provided. According to the NCO and the operating method of the NCO, it is possible to reduce the size of a lookup table memory by using a lookup table, which stores a plurality of phase compensation values for different phases obtained by using a cosine function or a sine function. Thus, it is possible to easily calculate cosine and sine addresses and cosine and sine signs and to quickly provide a cosine phase compensation signal and a sine phase compensation signal.
Claims17
A numerically-controlled oscillator (NCO) comprising:
- a lookup table memory which stores a plurality of phase compensation values for different phases;
- an address generator which calculates a number of addresses and a number of signs corresponding to an input phase;
- and
- a sign converter which converts the signs of a number of phase compensation values respectively corresponding to the addresses with reference to the signs.
An operating method of an NCO, the operating method comprising:
- setting a plurality of phase compensation values for different phases;
- calculating a number of addresses and a number of signs corresponding to an input phase;
- and
- converting the signs of a number of phase compensation values respectively corresponding to the addresses with reference to the signs.
Dependencies are inferred from the claim text.