Pipelined analog-to-digital converter with mid-sampling comparison
First Claim
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1. An apparatus including double-sampled pipeline analog-to-digital conversion (ADC) circuitry having a plurality of serially coupled 1.5 bit ADC stages, comprising:
- at least one electrode to convey an upstream residue signal from an upstream ADC stage;
residue signal generation circuitry coupled to said at least one electrode and responsive to said upstream residue signal, an analog quantization signal, a reset control signal and a first portion of a plurality of clock signals by providing a downstream residue signal;
sub-ADC circuitry coupled to said at least one electrode and responsive to said upstream residue signal and a latch control signal by providing first and second digital quantization signals;
digital-to-analog conversion (DAC) circuitry coupled to said sub-ADC circuitry and said residue signal generation circuitry, and responsive to said first and second digital quantization signals by providing said analog quantization signal; and
timing and control circuitry coupled to said residue signal generation circuitry and said sub-ADC circuitry, and responsive to at least a main clock signal by providing said reset control signal, said first portion of said plurality of clock signals and said latch control signal, wherein each one of said first portion of said plurality of clock signals includes respective leading and trailing signal state transitions, said latch control signal includes leading and trailing signal state transitions, and at least one of said leading and trailing latch control signal state transitions occurs approximately midway said leading and trailing clock signal state transitions.
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Abstract
A double-sampled pipeline analog-to-digital conversion (ADC) system and method in which latching of the intrastage digital quantization signals occurs approximately midway the leading and trailing edges of the clock signals.
15 Citations
12 Claims
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1. An apparatus including double-sampled pipeline analog-to-digital conversion (ADC) circuitry having a plurality of serially coupled 1.5 bit ADC stages, comprising:
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at least one electrode to convey an upstream residue signal from an upstream ADC stage; residue signal generation circuitry coupled to said at least one electrode and responsive to said upstream residue signal, an analog quantization signal, a reset control signal and a first portion of a plurality of clock signals by providing a downstream residue signal; sub-ADC circuitry coupled to said at least one electrode and responsive to said upstream residue signal and a latch control signal by providing first and second digital quantization signals; digital-to-analog conversion (DAC) circuitry coupled to said sub-ADC circuitry and said residue signal generation circuitry, and responsive to said first and second digital quantization signals by providing said analog quantization signal; and timing and control circuitry coupled to said residue signal generation circuitry and said sub-ADC circuitry, and responsive to at least a main clock signal by providing said reset control signal, said first portion of said plurality of clock signals and said latch control signal, wherein each one of said first portion of said plurality of clock signals includes respective leading and trailing signal state transitions, said latch control signal includes leading and trailing signal state transitions, and at least one of said leading and trailing latch control signal state transitions occurs approximately midway said leading and trailing clock signal state transitions. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus including double-sampled pipeline analog-to-digital conversion (ADC) circuitry having a plurality of serially coupled 1.5 bit ADC stages, comprising:
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residue signal generator means for receiving an upstream residue signal from an upstream ADC stage, an analog quantization signal, a reset control signal and a first portion of a plurality of clock signals and in response thereto generating a downstream residue signal; sub-ADC means for receiving said upstream residue signal and a latch control signal and in response thereto generating first and second digital quantization signals; digital-to-analog conversion (DAC) means for receiving said first and second digital quantization signals and in response thereto generating said analog quantization signal; and timing and control means for receiving at least a main clock signal and in response thereto generating said reset control signal, said first portion of said plurality of clock signals and said latch control signal, wherein each one of said first portion of said plurality of clock signals includes respective leading and trailing signal state transitions, said latch control signal includes leading and trailing signal state transitions, and at least one of said leading and trailing latch control signal state transitions occurs approximately midway said leading and trailing clock signal state transitions. - View Dependent Claims (7)
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8. A method of performing double-sampled pipeline analog-to-digital conversion (ADC) of a signal with a plurality of serially coupled 1.5 bit ADC stages, comprising:
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receiving an upstream residue signal from an upstream ADC stage; receiving an analog quantization signal; receiving a reset control signal; receiving a first portion of a plurality of clock signals; receiving a latch control signal; receiving at least a main clock signal; generating a downstream residue signal in response to said upstream residue signal, said analog quantization signal, said reset control signal and said first portion of a plurality of clock signals; generating first and second digital quantization signals in response to said upstream residue signal and said latch control signal; generating said analog quantization signal in response to said first and second digital quantization signals; and generating said reset control signal, said first portion of said plurality of clock signals and said latch control signal in response to at least said main clock signal; wherein each one of said first portion of said plurality of clock signals includes respective leading and trailing signal state transitions, said latch control signal includes leading and trailing signal state transitions, and at least one of said leading and trailing latch control signal state transitions occurs approximately midway said leading and trailing clock signal state transitions. - View Dependent Claims (9, 10, 11, 12)
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Specification