Arrangement and method for controlling gain of analog-to-digital converters
AssigneeAdvanced Micro Devices, Inc.
InventorsFiras N. Abughazaleh, Vijayakumaran V. Nair, Merle L. Miller, Michael Edward Stibila
Life of this patent
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Abstract
A gain control arrangement for use in analog-to-digital conversion includes a current generator that generates gain currents as a function of externally applied resistances. The gain currents are sequentially provided to the analog-to-digital converter, enabling the converter to use a single set of externally applied resistances to set differentiated gain factors in each of its channels.
Claims26
A gain selection arrangement for use in an analog-to-digital converter, comprising:
- a current generator, responsive to a first control signal and configured and arranged to generate a plurality of gain currents as a function of externally applied resistances and the first control signal;
- a gain current selection circuit, responsive to a second control signal and configured and arranged to sequentially provide each of the gain currents to the analog-to-digital converter;
- and
- a control circuit configured and arranged to generate the first and second control signals in response to a clock signal and a plurality of gain selection signals.
A gain selection arrangement for use in an analog-to-digital converter, comprising:
- a current generator, responsive to a first control signal and configured and arranged to generate a plurality of gain currents as a function of externally applied resistances and the first control signal;
- and
- a gain current selection circuit, responsive to a second control signal and configured and arranged to sequentially provide each of the gain currents to the analog-to-digital converter;
- wherein the current generator comprises a plurality of current sinks.
A gain selection arrangement for use in an analog-to-digital converter, comprising:
- a current generator, responsive to a first control signal and configured and arranged to generate a plurality of gain currents as a function of externally applied resistances and the first control signal;
- and
- a gain current selection circuit, responsive to a second control signal and configured and arranged to sequentially provide each of the gain currents to the analog-to-digital converter;
- wherein the gain current selection circuit comprises a plurality of transistors coupled in parallel.
A gain selection arrangement for use in an analog-to-digital converter, comprising:
- a current generator, responsive to a first control signal and configured and arranged to generate a plurality of gain currents as a function of externally applied resistances and the first control signal;
- a gain current selection circuit, responsive to a second control signal and configured and arranged to sequentially provide each of the gain currents to the analog-to-digital converter;
- and
- a current mirror arrangement responsive to the current generator and configured and arranged to provide the plurality of currents to the gain current selection circuit.
A gain selection arrangement for use in an analog-to-digital converter, comprising:
- a current generator, responsive to a first control signal and configured and arranged to generate a plurality of gain currents as a function of externally applied resistances and the first control signal;
- and
- a gain current selection circuit, responsive to a second control signal and configured and arranged to sequentially provide each of the gain currents to the analog-to-digital converter;
- wherein the gain current selection circuit is configured and arranged to selectively provide one of the plurality of gain currents to each of a plurality of channels of the analog-to-digital converter.
A method for controlling an amount of gain applied to an analog-to-digital converter, the method comprising:
- generating, in response to a first control signal, a plurality of gain currents having differentiated strengths as a function of externally applied resistances;
- and
- sequentially providing, in response to a second control signal, the gain currents to the analog-to-digital converter as a function of the differentiated strengths of the gain currents;
- further comprising generating the first and second control signals in response to a clock signal and gain selection.
A method for controlling an amount of gain applied to an analog-to-digital converter, the method comprising:
- generating, in response to a first control signal, a plurality of gain currents having differentiated strengths as a function of externally applied resistances;
- and
- sequentially providing, in response to a second control signal, the gain currents to the analog-to-digital converter as a function of the differentiated strengths of the gain currents;
- further comprising generating at least one of the first and second control signals in a preselected sequence.
A method for controlling an amount of gain applied to an analog-to-digital converter, the method comprising:
- generating, in response to a first control signal, a plurality of gain currents having differentiated strengths as a function of externally applied resistances;
- and
- sequentially providing, in response to a second control signal, the gain currents to the analog-to-digital converter as a function of the differentiated strengths of the gain currents;
- further comprising generating bias voltages as a function of the gain currents.
A method for controlling an amount of gain applied to an analog-to-digital converter, the method comprising:
- generating, in response to a first control signal, a plurality of gain currents having differentiated strengths as a function of externally applied resistances;
- and
- sequentially providing, in response to a second control signal, the gain currents to the analog-to-digital converter as a function of the differentiated strengths of the gain currents;
- further comprising generating the gain currents as a function of received codes.
A gain selection arrangement for use in an analog-to-digital converter, comprising:
- means for generating, in response to a first control signal, a plurality of gain currents having differentiated strengths as a function of externally applied resistances;
- means for sequentially providing, in response to a second control signal, the gain currents to the analog-to-digital converter as a function of the differentiated strengths of the gain currents;
- and
- control means for generating the first and second control signals in response to a clock signal and a plurality of gain selection signals.
Dependencies are inferred from the claim text.