Analog to digital converter with interpolation of reference ladder
AssigneeBroadcom Corporation
InventorJan Mulder
Life of this patent
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Abstract
An N-bit analog to digital converter includes a reference ladder connected to an imput voltage at one end, and to ground at another end, an array of differential amplifiers whose differential inputs are connected to taps from the reference ladder, wherein each amplifier has a first differential input connected to the same tap as a neighboring amplifier, and a second differential imput shifted one tap from the neighboring amplifier, and an encoder that converts outputs the array to an N-bit output.
Claims40
An input stage of an analog to digital converter comprising:
- an array of differential amplifiers whose differential inputs are connected to interpolated voltage taps and to a signal input,
- wherein each differential amplifier has a first differential input connected to the same interpolated voltage tap as a neighboring amplifier, and a second differential input shifted by an integer number of interpolated voltage taps from the neighboring amplifier, and
- wherein a zero crossing of outputs of the differential amplifiers represents the signal input.
An input stage of an analog to digital converter comprising:
- a plurality of differential amplifiers whose differential inputs are connected to interpolated voltage taps and to a signal input,
- wherein any pair of neighboring differential amplifiers has one set of differential inputs of the same polarity connected to the same interpolated voltage tap, and one set of differential inputs of the same polarity connected to a different interpolated voltage tap, and
- wherein a zero crossing of outputs of the differential amplifiers represents the signal input.
An input stage of an analog to digital converter comprising:
- an array of differential amplifiers whose inputs are connected to interpolated voltage taps and to a signal input,
- wherein each amplifier has a first polarity input corresponding to one interpolated tap such that adjacent amplifiers share the one interpolated voltage tap, and
- wherein each amplifier has a second polarity input such that adjacent amplifiers are connected to other interpolated voltage taps, and
- wherein a zero crossing of outputs of the differential amplifiers represents the signal input.
An input stage of an analog to digital converter comprising:
- a plurality of amplifiers whose inputs are connected to a plurality of interpolated voltage taps and to a signal input,
- wherein each amplifier has inputs shifted by a fraction of an interpolated voltage tap relative to its adjacent amplifier, and
- wherein a zero crossing of outputs of the differential amplifiers represents the signal input.
Dependencies are inferred from the claim text.