Semiconductor device and method
First Claim
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1. An integrated circuit, comprising:
- a signal generator;
a first inverter connected to the signal generator through a first coupling capacitor;
a reference signal generating circuit connected to the signal generator through a second coupling capacitor, the reference signal generating signal being configured to generate a reference signal;
a pull down block, comprising one or more pull down branches, wherein each pull down branch of the one or more pull down branches is connected to an output of the first inverter and to one or more programmable input signals, and wherein each pull down branch is configured to adjust a voltage threshold of the first inverter in response to the one or more programmable input signals to which the respective pull down branch is connected being activated;
a second inverter, wherein an input of the second inverter is connected to the output of the first inverter;
a first comparator, configured to compare an output of the second inverter to the reference signal to generate a pulse signal.
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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. A differential pulse injection oscillator circuit and a pulse injection signal generator circuit are also provided.
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Citations
20 Claims
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1. An integrated circuit, comprising:
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a signal generator; a first inverter connected to the signal generator through a first coupling capacitor; a reference signal generating circuit connected to the signal generator through a second coupling capacitor, the reference signal generating signal being configured to generate a reference signal; a pull down block, comprising one or more pull down branches, wherein each pull down branch of the one or more pull down branches is connected to an output of the first inverter and to one or more programmable input signals, and wherein each pull down branch is configured to adjust a voltage threshold of the first inverter in response to the one or more programmable input signals to which the respective pull down branch is connected being activated; a second inverter, wherein an input of the second inverter is connected to the output of the first inverter; a first comparator, configured to compare an output of the second inverter to the reference signal to generate a pulse signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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generating, by a signal generator, a sinusoidal signal; adjusting, by one or more programmable pull down branches, a voltage threshold of a first inverter; generating, by the first inverter, a first signal using the sinusoidal signal, wherein the first signal is a square wave signal alternating between a low value and a high value, and wherein a time duration of the low values of the first signal depend at least in part on the adjusted voltage threshold of the first inverter; generating a second signal by inverting the first signal; generating a first reference signal; and generating a first pulse signal by comparing the second signal and the first reference signal. - View Dependent Claims (10, 11, 12)
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13. An integrated circuit, comprising:
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a reference signal generator, configured to generate a reference signal; a first inverter; a pull down block, comprising one or more pull down branches, wherein each pull down branch of the one or more pull down branches is connected to an output of the first inverter and to one or more programmable input signals, and wherein each pull down branch of the one or more pull down branches is configured to adjust a voltage threshold of the first inverter in response to the one or more programmable input signals to which the respective pull down branch is connected being activated; a second inverter, wherein an input of the second inverter is connected to the output of the first inverter and to each of the one or more pull down branches; a comparator, configured to compare an output of the second inverter to the reference signal to generate a positive reference pulse signal; an LC tank oscillator circuit; a positive pulse injection circuit, wherein an output of the comparator is connected to an input of the positive pulse injection circuit, and an output of the positive pulse injection circuit is connected to a first node of the LC tank oscillator circuit; and a negative pulse injection circuit, wherein an output of the negative pulse injection circuit is connected to a second node of the LC tank oscillator circuit, and wherein an input of the negative pulse injection circuit is configured to receive a negative reference signal, wherein the negative reference signal is an inverse of the positive reference pulse signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification