Semiconductor device and method
First Claim
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1. 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;
a first active feedback device connected to the first set of inductors;
a second active feedback device connected to the first set of inductors; and
a capacitor connected between a first inductor of the first set of inductors and a second inductor of the first set of inductors, the capacitor having a constant capacitance; and
a second digital controlled oscillator coupled to the first digital controlled oscillator.
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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.
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Citations
20 Claims
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1. An integrated circuit device comprising:
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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; a first active feedback device connected to the first set of inductors; a second active feedback device connected to the first set of inductors; and a capacitor connected between a first inductor of the first set of inductors and a second inductor of the first set of inductors, the capacitor having a constant capacitance; and a second digital controlled oscillator coupled to the first digital controlled oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit device comprising:
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a first digital controlled oscillator, the first digital controlled oscillator comprising; a first set of inductors, each inductor of the first set of inductors having a first inductance; a second set of inductors, each inductor of the second set of inductors having a second inductance different from the first inductance; a switched capacitor array connected between the first set of inductors and the second set of inductors; a first active feedback device connected between one of the first set of inductors or the second set of inductors and a ground node, the first active feedback device comprising NMOS devices, wherein a connection between the first active feedback device and the one of the first set of inductors or the second set of inductors has a constant capacitance; and a second active feedback device connected between the one of the first set of inductors or the second set of inductors and a power node; a second digital controlled oscillator coupled to the first digital controlled oscillator. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An integrated circuit device comprising:
a first digital controlled oscillator comprising; a first inductor; a second inductor having a different inductance than the first inductor; a switched capacitor array coupled between the first inductor and the second inductor; a first active feedback device, wherein the first inductor is coupled between the switched capacitor array and the first active feedback device; a second active feedback device, wherein the first inductor is coupled between the switched capacitor array and the second active feedback device; and a fixed capacitor, wherein the first inductor is coupled between the switched capacitor array and the fixed capacitor. - View Dependent Claims (16, 17, 18, 19, 20)
Specification