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US 7,126,508 B2Granted
Analog-to-digital conversion system, correction circuit, and correction method
AssigneeNEC Electronics Corporation
InventorKatsutoshi Seki
Life of this patent
Estimating the term…
Abstract
Disclosed is an interleaved ADC comprising first and second component ADCs that use pipelined ADCs extracts an image component, which is generated by a gain error, with the use of a band pass filter for correcting the gain error so that the power of the image component is minimized.
Claims20
An analog-to-digital conversion system comprising:
- a pipelined analog-to-digital conversion circuit for receiving an analog signal and converting the analog signal to a digital signal for output;
- and
- a correction circuit for controlling a correction of a gain error of said analog-to-digital conversion circuit,
- said correction circuit including:
- a filter for receiving the output signal of said analog-to-digital conversion circuit and extracting a predetermined frequency component generated by a gain error of said analog-to-digital conversion circuit;
- and
- a control circuit for calculating a power of the frequency component extracted by said filter and for generating a control signal for correcting the gain error of said analog-to-digital conversion circuit, based on the frequency component extracted by said filter and supplying the generated control signal to said analog-to-digital conversion circuit.
4 more elements
An analog-to-digital conversion system comprising:
- a pipelined analog-to-digital conversion circuit for receiving an analog signal and converting the analog signal to a digital signal for output;
- and
- a correction circuit for controlling a correction of a gain error of said analog-to-digital conversion circuit.
- said correction circuit including:
- a filter for receiving the output signal of said analog-to-digital conversion circuit and extracting a predetermined frequency component generated by a gain error of said analog-to-digital conversion circuit;
- and
- a control circuit for generating a control signal for correcting the gain error of said analog-to-digital conversion circuit, based on the frequency component extracted by said filter and supplying the generated control signal to said analog-to-digital conversion circuit,
- wherein a band-limited signal is supplied to an analog input terminal of said analog-to-digital conversion circuit;
- wherein, in said correction circuit, said filter selectively extracts a signal having a predetermined range of frequency band including a frequency obtained by subtracting a center frequency of the band-limited signal from a Nyquist frequency by letting the signal pass through said filter;
- and
- wherein said control circuit comprises;
- a power calculation unit for calculating a power of the frequency component extracted by said filter;
- and
- a correction control unit for receiving the power calculated by said power calculation unit, generating the control signal for correcting the gain error of said analog-to-digital conversion circuit to reduce a value of the power, and supplying the control signal to said analog-to-digital conversion circuit.
11 more elements
An analog-to-digital conversion system comprising:
- a plurality of parallel pipelined analog-to-digital conversion circuits, each receiving an analog signal at an analog input terminal thereof, converting the analog signal to a digital signal, and outputting the converted signal, said plurality of analog-to-digital conversion circuits receiving clock signals as sampling clock signals, phases of said clock signals being spaced each other;
- a multiplexer for receiving and multiplexing a plurality of digital signal outputs from said plurality of analog-to-digital conversion circuits;
- a band pass filter for receiving the output signal of said multiplexer and extracting a predetermined frequency component generated by a gain error of said analog-to-digital conversion circuits;
- a power calculation unit for calculating a power of the frequency component extracted by said band pass filter;
- and
- a correction circuit control unit for supplying control signals to said plurality of analog-to-digital conversion circuits for correcting the gain error of said analog-to-digital conversion circuits to reduce a value of the power of the frequency component.
3 more elements
A correction circuit for correcting a gain error of a pipelined analog-to-digital conversion circuit that receives an analog signal, converts the analog signal to a digital signal, and outputs the converted signal, said correction circuit comprising:
- a filter for receiving the output signal of said analog-to-digital conversion circuit and extracting a frequency component generated by a gain error of said analog-to-digital conversion circuit;
- and
- a control circuit for calculating a power of the frequency component extracted by said filter and outputs a control signal for correcting the gain error of said analog-to-digital conversion circuit to reduce a value of the power.
A correction method for a pipelined analog-to-digital conversion circuit that receives an analog signal, converts the analog signal to a digital signal, and outputs the converted signal, said correction method comprising:
- receiving the output signal of said analog-to-digital conversion circuit and extracting a frequency component, generated by a gain error of said analog-to-digital conversion circuit by a filter;
- correcting the gain error of said analog-to-digital conversion circuit based on the frequency component extracted by said filter;
- and
- calculating a power of the frequency component extracted by said filter.
1 more element
A correction method for a pipelined analog-to-digital conversion circuit that receives an analog signal, converts the analog signal to a digital signal, and outputs the converted signal, said correction method comprising:
- receiving the output signal of said analog-to-digital conversion circuit and extracting a frequency component, generated by a gain error of said analog-to-digital conversion circuit by a filter;
- correcting the gain error of said analog-to-digital conversion circuit based on the frequency component extracted by said filter;
- receiving a band-limited signal at an analog input terminal of said analog-to-digital conversion circuit;
- selectively letting a signal pass through said filter, said signal having a predetermined range of frequency band including a frequency obtained by subtracting a center frequency of the band-limited signal from a Nyquist frequency,
- calculating a power of a frequency component output by said filter;
- and
- generating a control signal for correcting the gain error of said analog-to-digital conversion circuit to reduce the calculated power.
4 more elements
An analog-to-digital conversion system comprising:
- analog-to-digital conversion means for receiving an analog signal and converting the analog signal to a digital signal for output;
- and
- correction means for controlling a correction of a gain error of said analog-to-digital conversion circuit,
- said correction means including:
- filter means for receiving the output signal of said analog-to-digital conversion means and extracting a predetermined frequency component generated by a gain error of said analog-to-digital conversion means;
- and
- control means for generating a control signal for correcting the gain error of said analog-to-digital conversion means, based on the frequency component extracted by said filter means and supplying the generated control signal to said analog-to-digital conversion means.
4 more elements
Dependencies are inferred from the claim text.