Double-sampled, sample-and-hold circuit with downconversion
First Claim
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1. A circuit comprising:
- a sampling circuit configured to double-sample a first input signal and a second input signal, and to provide a first output voltage and a second output voltage to an amplifier, wherein the sampling circuit is switchable in a manner that downconverts the first input signal and the second input signal; and
the amplifier, coupled to the first sampling circuit, configured to hold the first output voltage and the second output voltage.
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Abstract
A device (200, FIG. 2) includes receive hardware (204) which performs analog-to-digital conversion. In accordance with an embodiment of the invention, the receive hardware includes a pipelined analog-to-digital converter (320, FIG. 3). Sample-and-hold circuitry (410, FIG. 4) associated with the analog-to-digital converter is configured (FIGS. 8, and 12-14) and switched (FIG. 7) in a manner that provides intermediate frequency to baseband downconversion and skew-insensitive double-sampling.
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Citations
27 Claims
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1. A circuit comprising:
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a sampling circuit configured to double-sample a first input signal and a second input signal, and to provide a first output voltage and a second output voltage to an amplifier, wherein the sampling circuit is switchable in a manner that downconverts the first input signal and the second input signal; and
the amplifier, coupled to the first sampling circuit, configured to hold the first output voltage and the second output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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an amplifier, which receives an input signal and produces an amplified signal;
a mixer, which receives and downconverts the amplified signal to an intermediate frequency (IF) input signal;
a variable gain amplifier, which adjusts a power level of the IF input signal based on a dynamic range of an analog-to-digital converter; and
the analog-to-digital converter, which receives an amplified IF signal from the variable gain amplifier, downconverts the amplified IF signal, and converts the amplified IF signal into digital information, wherein the analog-to-digital converter includes a sampling circuit configured to double-sample a first input signal and a second input signal, and to provide a first output voltage and a second output voltage to a second amplifier, wherein the sampling circuit is switchable in a manner that downconverts the first input signal and the second input signal, the second amplifier, coupled to the first sampling circuit, configured to hold the first output voltage and the second output voltage, and a converter, coupled to the second amplifier. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A device comprising:
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receive hardware, which includes a sampling circuit configured to double-sample a first input signal and a second input signal, and to provide a first output voltage and a second output voltage to an amplifier, wherein the sampling circuit is switchable in a manner that downconverts the first input signal and the second input signal, the amplifier, coupled to the first sampling circuit, configured to hold the first output voltage and the second output voltage, and a converter, coupled to the amplifier, which produces digital information; and
one or more processors, coupled to the receive hardware, capable of processing the digital information. - View Dependent Claims (17, 18, 19, 20)
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21. A method for downconverting an analog signal and performing analog-to-digital conversion, comprising:
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providing a sampling circuit that receives a differential input signal including a first input signal and a second input signal, wherein the sampling circuit includes a first capacitor, a second capacitor, a first set of switches that are switchable together, and that are coupled to the first capacitor and the second capacitor, a third capacitor, a fourth capacitor, and a second set of switches that are switchable together, and that are coupled to the third capacitor and the fourth capacitor;
closing the first set of switches, which causes the first capacitor to be charged by the first input signal, the second capacitor to be charged by the second input signal, and a first output voltage across the third capacitor and a second output voltage across the fourth capacitor to be provided to an amplifier;
opening the first set of switches;
closing the second set of switches, which causes the third capacitor to be charged by the first input signal, the fourth capacitor to be charged by the second input signal, and a third output voltage across the first capacitor and a fourth output voltage across the second capacitor to be provided to the amplifier; and
opening the second set of switches. - View Dependent Claims (22, 23, 24)
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25. A method for downconverting an analog signal and performing analog-to-digital conversion, comprising:
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double-sampling a first input signal and a second input signal, using a sampling circuit, to provide a first output voltage and a second output voltage;
downconverting the first input signal and the second input signal using the sampling circuit; and
holding the first output voltage and the second output voltage. - View Dependent Claims (26, 27)
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Specification