Circuit with noise shaper
First Claim
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1. A circuit, comprising:
- an oscillator configured to generate an output signal, said output signal having a frequency;
a feedback value generator coupled to said oscillator, said feedback value generator comprising a noise shaper circuit and being configured to generate a feedback value depending on said output signal, the feedback value being noise shaped, wherein said feedback value generator comprises;
a phase shifter circuit configured to shift a phase of said output signal controlled by said noise shaper circuit and to output a phase shifted output signal, anda phase quantizer configured to receive said phase shifted output signal;
a reference value generator configured to generate a reference value depending on a predetermined value;
a combiner configured to combine said reference value and said feedback value, and to output a combined value; and
a loop filter configured to generate a control signal to control said oscillator depending on said combined signal.
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Abstract
In an embodiment, a circuit comprising an oscillator is provided. The oscillator is controlled based on a feedback value and an input reference value. The feedback value or the reference value or both are generated using noise shaping.
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Citations
15 Claims
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1. A circuit, comprising:
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an oscillator configured to generate an output signal, said output signal having a frequency; a feedback value generator coupled to said oscillator, said feedback value generator comprising a noise shaper circuit and being configured to generate a feedback value depending on said output signal, the feedback value being noise shaped, wherein said feedback value generator comprises; a phase shifter circuit configured to shift a phase of said output signal controlled by said noise shaper circuit and to output a phase shifted output signal, and a phase quantizer configured to receive said phase shifted output signal; a reference value generator configured to generate a reference value depending on a predetermined value; a combiner configured to combine said reference value and said feedback value, and to output a combined value; and a loop filter configured to generate a control signal to control said oscillator depending on said combined signal. - View Dependent Claims (2, 3, 4)
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5. A circuit, comprising:
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an oscillator comprising a control input and an output, a reference clock input, a phase quantizer comprising an input, an output and a clock input, said input of said phase quantizer being coupled with said output of said oscillator and said clock input of said phase quantizer being coupled with said reference clock input, a first storage and a second storage, a noise shaper circuit comprising an input, an output and a clock input, said input of said noise shaper being coupled with said second storage, and a combiner comprising a first input, a second input, a third input and an output, a first input of said combiner being coupled with said first storage, a second input of said combiner being coupled with said output of said noise shaper and a third input of said combiner being coupled with said output of said phase quantizer, and a loop filter comprising an input, an output and a clock input, said clock input of said loop filter being coupled with said reference clock, said output of said loop filter being coupled with said control input of said oscillator and said input of said loop filter being coupled with said output of said combiner. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A circuit, comprising:
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an oscillator comprising an output and a control input, a phase shifter circuit comprising an input, an output and a control input, said input of said phase shifter circuit being coupled with said output of said oscillator, a noise shaper circuit comprising an output and a clock input, said output of said noise shaper circuit being coupled with said control input of said phase shifter circuit and said clock input of said noise shaper circuit being coupled with a reference clock input, a phase quantizer comprising an input and an output, said input of said phase quantizer being coupled with said output of said phase shifter, a storage comprising an output, a combiner comprising a first input, a second input and an output, said first input of said combiner being coupled with said output of said storage and said second input of said combiner being coupled with said output of said phase quantizer, and a loop filter comprising an input and an output, said input of said loop filter being coupled with said output of said combiner and said output of said loop filter being coupled with said control input of said oscillator. - View Dependent Claims (12, 13, 14, 15)
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Specification