Apparatus for overload recovery of an integrator in a sigma-delta modulator
First Claim
Patent Images
1. An apparatus comprising:
- an amplifier having an input and an output;
a capacitor coupled to the input and the output of the amplifier;
an analog-to-digital converter (ADC) coupled to the output of the amplifier;
a Digital-to-Analog converter (DAC) coupled to an output of the ADC and to the input of the amplifier; and
a circuitry coupled to the output of the ADC and the output of the DAC, wherein the circuitry is to compensate for an excess delay of at least a portion of a feedback path comprising the ADC, wherein the DAC comprises;
a p type current source;
a first p-type transistor coupled in series with the p-type current source;
a first n-type transistor coupled in series with the first p-type transistor; and
an n-type current source coupled in series with the first n-type transistor.
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Abstract
Described is an apparatus which comprises: a first integrator to receive an input signal and to generate a first output; a second integrator to receive the first output or a version of the first output and to generate a second output; and an analog-to-digital converter (ADC) to quantize the second output into a digital representation, the ADC including a detection circuit to detect an overload condition in the second output.
10 Citations
33 Claims
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1. An apparatus comprising:
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an amplifier having an input and an output; a capacitor coupled to the input and the output of the amplifier; an analog-to-digital converter (ADC) coupled to the output of the amplifier; a Digital-to-Analog converter (DAC) coupled to an output of the ADC and to the input of the amplifier; and a circuitry coupled to the output of the ADC and the output of the DAC, wherein the circuitry is to compensate for an excess delay of at least a portion of a feedback path comprising the ADC, wherein the DAC comprises; a p type current source; a first p-type transistor coupled in series with the p-type current source; a first n-type transistor coupled in series with the first p-type transistor; and an n-type current source coupled in series with the first n-type transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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integrator having an input and an output; an analog-to-digital converter (ADC) coupled to the output of the integrator; a Digital-to-Analog converter (DAC) coupled to an output of the ADC and to the input of the integrator; and circuitry coupled to the output of the ADC and the input of the integrator, wherein the DAC comprises; a p-type current source; a first p-type transistor coupled in series with the p-type current source; a first n-type transistor coupled in series with the first p-type transistor; and an n-type current source coupled in series with the first n-type transistor. - View Dependent Claims (12, 13, 14)
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15. An apparatus comprising:
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means for integrating an analog input current and generating an analog output; means for converting the analog output to a corresponding digital output; means for converting the corresponding digital output to an analog current, wherein the means for converting the corresponding digital output to the analog current includes a p-type current source a first p-type transistor coupled in series with the p-type current source;
a first n-type transistor coupled in series with the first p-type transistor; and
an n-type current source coupled in series with the first n-type transistor;means for compensating an excess delay associated with the means for converting the analog output, and for generating an output current; and means for summing the analog current with the analog input current and the output current. - View Dependent Claims (16, 17, 18)
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19. An apparatus comprising:
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a first amplifier having an input and an output; a second amplifier having an input and an output; a resistor coupled to the output of the first amplifier and the input of the second amplifier; a first capacitor coupled to the input and the output of the first amplifier; a second capacitor coupled to the input and the output of the second amplifier; a analog-to-digital converter coupled to the output of the second amplifier; a digital-to-analog converter coupled to an output of the analog-to-digital converter, wherein an output of the digital-to-analog converter is coupled to the input of the first amplifier; and a compensation circuit having an input coupled to the output of the analog-to-digital converter, wherein the compensation circuit has an output coupled to the input of the second amplifier, wherein the digital-to-analog converter comprises;
a p-type current source;
a first p-type transistor coupled in series with the p-type current source;
a first n-type transistor coupled in series with the first p-type transistor; and
an n-type current source coupled in series with the first n-type transistor. - View Dependent Claims (20)
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21. A communication device comprising:
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an antenna; a low noise amplifier coupled to the antenna; a mixer coupled to an output of the low noise amplifier; a filter coupled to the output of the mixer; and a sigma-delta modulator with an excess delay compensation circuitry, wherein the sigma-delta modulator is coupled to the first filter, wherein the sigma-delta modulator comprises a digital to analog converter which includes; a p type current source; a first p-type transistor coupled in series with the p-type current source; a first n-type transistor coupled in series with the first p-type transistor; and an n-type current source coupled in series with the first n-type transistor. - View Dependent Claims (22, 23, 24)
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25. An apparatus comprising:
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an integrator to integrate an analog input current and for generating an analog output; a analog-to-digital converter to convert the analog output to a corresponding digital output; a digital-to-analog converter to convert the corresponding digital output to an analog current; circuit for compensating excess delay associated with the analog-to digital converter, wherein the circuit is to generate an output current; and a node for summing the analog current with the analog input current and the output current, wherein the digital-to-analog converter comprises;
a p-type current source;
a first p-type transistor coupled in series with the p-type current source;
a first n-type transistor coupled in series with the first p-type transistor; and
an n-type current source coupled in series with the first n-type transistor. - View Dependent Claims (26, 27)
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28. An apparatus comprising:
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an amplifier having an input and an output; a capacitor coupled to the input and the output of the amplifier; an analog-to-digital converter (ADC) coupled to the output of the amplifier; a Digital-to-Analog converter (DAC) coupled to an output of the ADC and to the input of the amplifier; and a circuitry coupled to the output of the ADC and the input of the amplifier, wherein the circuitry is to compensate for an excess delay of at least a portion of a feedback path comprising the ADC, wherein the DAC comprises; a p-type current source; a first p-type transistor coupled in series with the p-type current source; a first n-type transistor coupled in series with the first p-type transistor; and an n-type current source coupled in series with the first n-type transistor. - View Dependent Claims (29, 30, 31, 32)
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33. A method comprising:
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integrating an analog input current and generating an analog output; converting the analog output to a corresponding digital output; converting the corresponding digital output to an analog current; compensating an excess delay associated with the means for converting the analog output, and generating an output current as a result of compensating; and summing the analog current with the analog input current and the output current, wherein converting the corresponding digital output to the analog current is performed by a circuitry that comprises;
a p type current source;
a first p-type transistor coupled in series with the p-type current source;
a first n-type transistor coupled in series with the first p-type transistor; and
an n-type current source coupled in series with the first n-type transistor.
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Specification