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AssigneeInternational Business Machines Corporation
InventorsRobert Andrew Kertis, Peter John Windler
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A circuit is disclosed which adjusts the phase of a signal within an LC sinusoidal or a ring or other capacitive oscillator. The circuit uses FETs as capacitors. The gates of the FETs are connected to the capacitive node of the oscillator. The variable voltage source changes the state of the FET from depleted to inverted mode or from inverted to depleted mode which in turn dramatically changes the capacitance of the FET. The change of state exists for only a few clock cycles, typically less than five cycles, so that only the capacitance within the oscillator is instantaneously affected which changes adds as incremental/decremental frequency to adjust only the phase of the oscillation frequency. In this fashion, the average oscillation frequency not affected.
An LC sinusoidal oscillator comprising;
A phase correction circuit for an oscillator circuit having a capacitive element, said phase correction circuit comprising:
A phase correction circuit connected to an oscillator, the oscillator comprising a fixed capacitive element to determine oscillation frequency, the phase correction circuit comprising at least one FET whose source and drain are electrically connected together, the at least one FET further connected to an incremental/decremental voltage source wherein an incremental/decremental voltage is applied for a sufficient time to allow the at least one FET to transition from either a depleted to an inverted mode or from an inverted to a depleted mode thereby providing an instantaneous incremental/decremental phase adjustment of the oscillator frequency.
Dependencies are inferred from the claim text.