Semiconductor device and method
First Claim
Patent Images
1. An integrated circuit device comprising:
- 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; and
an active feedback device connected between one of the first set of inductors or the second set of inductors and a ground node, the active feedback device comprising NMOS devices, wherein a connection between the active feedback device and the one of the first set of inductors or the second set of inductors has a constant capacitance;
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, anda decoder connected to an output of the skew detector, wherein an output from the decoder is connected to a switched capacitor array within the first digital controlled oscillator.
1 Assignment
0 Petitions
Accused Products
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.
59 Citations
20 Claims
-
1. An integrated circuit device comprising:
-
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; and an active feedback device connected between one of the first set of inductors or the second set of inductors and a ground node, the active feedback device comprising NMOS devices, wherein a connection between the active feedback device and the one of the first set of inductors or the second set of inductors has a constant capacitance; 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 switched capacitor array within the first digital controlled oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 20)
-
-
8. 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, the switched capacitor array being coupled between a first inductor and a second inductor, the first inductor having a different inductance than the second inductor, the first inductor being coupled between the switched capacitor array and a first active feedback device, the first inductor being further coupled between the switched capacitor array and a second active feedback device, wherein a fixed capacitor is coupled between first inductor and the first active feedback device. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. An integrated circuit device comprising:
-
a first digital controlled oscillator, wherein the first digital controlled oscillator comprises; 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, wherein individual inductors of the first set of inductors are in series with individual inductors of the second set of inductors; a switched capacitor array connected between the first set of inductors and the second set of inductors; an active feedback device connected between one of the first set of inductors or the second set of inductors and a ground node, the active feedback device comprising NMOS devices; and a capacitor connected between the active feedback device and the one of the first set of inductors or the second set of inductors, the capacitor comprising a constant capacitance capacitor; 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 the switched capacitor array within the first digital controlled oscillator. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification