| 摘要 |
PURPOSE: A numerically controlled oscillator in particular for a radio frequency signal receiver is provided to reduce an energy consumption as much as possible while overcoming the drawbacks of oscillators of the prior art. CONSTITUTION: An oscillator(8) essentially includes a first accumulation stage for a number Ob of most-significant bits of the binary word with Nb bits received at its input and a second accumulation stage for a number Pb of least-significant bits of the binary word. The second accumulation stage is formed of a phase register(9), called the LSBA(Least Significant Bit Accumulator) register, for the Pb least-significant bits of the binary word, followed by a phase accumulator(11) supplying a certain number of output signals or output bits. The Pb bits stored in register(9) are placed at the input of accumulator(11) to be added at each clock stroke at the second frequency CLK/N to Pb preceding output bits of accumulator(11). Normally, the Pb preceding output bits are in an equal number to the Pb bits from register(9). At each clock stroke at the second frequency imposed on the accumulator, a running total addition is performed at the output of accumulator(11).
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