Semiconductor Device and Method
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsLan-Chou Cho, Huan-Neng Chen, Chewn-Pu Jou, Feng Wei Kuo
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Abstract
A circuit includes a first digital controlled oscillator and a second digital controlled oscillator coupled to the first digital controlled oscillator. A skew detector is connected to determine a skew between outputs of the first digital controlled oscillator and the second digital controlled oscillator, and a decoder is utilized to output a control signal, based on the skew, to modify a frequency of the first digital controlled oscillator using a switched capacitor array to reduce or eliminate the skew.
Claims20
An integrated circuit device comprising:
- a first digital controlled oscillator;
- a second digital controlled oscillator coupled to the first digital controlled oscillator;
- a skew detector connected to outputs of both the first digital controlled oscillator and the second digital controlled oscillator;
- and
- a decoder connected to an output of the skew detector, wherein an output from the decoder is connected to a switch capacitor array within the first digital controlled oscillator.
An integrated circuit device comprising:
- a first digital controlled oscillator, wherein the first digital controlled oscillator comprises:
- a first set of inductors, each one of the first set of inductors having a first inductance;
- a second set of inductors, each one of the second set of inductors having a second inductance different from the first inductance, wherein individual ones of the first set of inductors are in series with individual ones of the second set of inductors;
- a switched capacitor array connected between the first set of inductors and the second set of inductors;
- and
- an active feedback device connected to one of the first set of inductors or the second set of inductors;
- and
- a second digital controlled oscillator coupled to the first digital controlled oscillator.
A method comprising:
- determining a first skew between a first clock signal and a second clock signal, the first clock signal originating from a first digital controlled oscillator, the second clock signal originating from a second digital controlled oscillator coupled to the first digital controlled oscillator;
- and
- modifying a natural frequency of the first digital controlled oscillator by sending a signal to a switched capacitor array within the first digital controlled oscillator, the signal being based on the first skew.
Dependencies are inferred from the claim text.