Generation of an Oscillation Signal
First Claim
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1. An apparatus, comprising:
- a phase accumulator configured to accumulate a phase increment comprising an overflow to a phase information signal;
a phase quantizer configured to quantize the phase information signal;
a mapper configured to map the quantized phase information signal to an amplitude information signal;
an amplitude quantizer having a first filter of an nth order having fixed filter coefficients and defining a transfer function, the amplitude quantizer configured to quantize the amplitude information signal and to feed back quantization noise using the first filter, wherein the feedback of the quantization noise comprises zeros at least two mutually different frequencies in the transfer function; and
a digital/analog converter configured to convert the quantized amplitude information signal to an oscillation signal.
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Abstract
Methods and apparatuses for accumulating a phase increment that comprises an overflow to a phase information signal; mapping the phase information signal to an amplitude information signal; quantizing the amplitude information signal while feeding back a quantization noise using a first filter of an nth order, so that the feedback of the quantization noise comprises zeros at least two mutually different frequencies in a transfer function of the first filter; and performing digital/analog conversion of the quantized amplitude information signal to an oscillation signal.
134 Citations
28 Claims
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1. An apparatus, comprising:
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a phase accumulator configured to accumulate a phase increment comprising an overflow to a phase information signal; a phase quantizer configured to quantize the phase information signal; a mapper configured to map the quantized phase information signal to an amplitude information signal; an amplitude quantizer having a first filter of an nth order having fixed filter coefficients and defining a transfer function, the amplitude quantizer configured to quantize the amplitude information signal and to feed back quantization noise using the first filter, wherein the feedback of the quantization noise comprises zeros at least two mutually different frequencies in the transfer function; and a digital/analog converter configured to convert the quantized amplitude information signal to an oscillation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus, comprising:
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phase accumulation means for accumulating a phase increment comprising an overflow to a phase information signal; phase quantization means for quantizing the phase information signal; mapping means for mapping the quantized phase information signal to an amplitude information signal; amplitude quantization means having a first filter of an nth order having fixed filter coefficients and defining a transfer function, the amplitude quantization means for quantizing the amplitude information signal and for feeding back quantization noise using the first filter, wherein the feedback of the quantization noise comprises zeros at least two mutually different frequencies in the transfer function; and digital/analog conversion means for converting the quantized amplitude information signal to an oscillation signal.
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11. An apparatus, comprising
a phase accumulator comprising an overflow having a phase increment default input and a j-bit phase information signal output; -
an adder comprising a first j-bit adder input coupled to the j-bit phase information signal output, a second adder input, and a j-bit adder output; a phase noise shaping feedback loop coupled between the (j−
k)th least significant bits of the j-bit adder output and the second adder input;a first filter having fixed coefficients configured to be switched into the phase noise shaping feedback loop; a lookup-table memory comprising a k-bit phase information signal input and a one-bit amplitude information signal output; a one-bit adder comprising a first one-bit adder input coupled to the one-bit amplitude information signal output, a second adder input and a one-bit adder output; an amplitude noise shaping feedback loop coupled between the (1−
m)th least significant bits of the one-bit adder output and the second adder input;a second filter comprising fixed filter coefficients configured to be switched into the amplitude noise shaping feedback loop, so that the amplitude noise shaping feedback loop comprises zeros at least two mutually different frequencies in a transfer function of the second filter; and a digital/analog converter comprising an m-bit amplitude information signal input. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus, comprising
a phase accumulator comprising an overflow and a phase increment default input; -
a digital/analog converter; a phase-to-amplitude mapper coupled between the phase accumulator and the digital/analog converter; a phase increment control having an output and defining a fixed phase increment variation curve within a predetermined phase increment variation interval, the output of the phase increment control being coupled to the phase increment default input; and a quantizer coupled between the phase-to-amplitude mapper and the digital/analog converter and comprising a noise shaping feedback loop that comprises an n-order filter having fixed filter coefficients and configured to be switched into the noise shaping feedback loop so that the noise shaping feedback loop comprises zeros at least two mutually different frequencies in a transfer function of the filter. - View Dependent Claims (17, 18)
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19. A method, comprising:
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accumulating a phase increment that comprises an overflow to a phase information signal; mapping the phase information signal to an amplitude information signal; quantizing the amplitude information signal while feeding back a quantization noise using a first filter of an nth order, so that the feedback of the quantization noise comprises zeros at least two mutually different frequencies in a transfer function of the first filter; and performing digital/analog conversion of the quantized amplitude information signal to an oscillation signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A computer-readable medium storing computer-executable instructions for performing a method, the method comprising:
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accumulating a phase increment that comprises an overflow to a phase information signal; mapping the phase information signal to an amplitude information signal; quantizing the amplitude information signal while feeding back a quantization noise using a first filter of an nth order, so that the feedback of the quantization noise comprises zeros at least two mutually different frequencies in a transfer function of the first filter; and performing digital/analog conversion of the quantized amplitude information signal to an oscillation signal.
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Specification