Low power amplifier structures and calibrations for the low power amplifier structures
AssigneeAnalog Devices, Inc.
InventorAhmed Mohamed Abdelatty ALI
Life of this patent
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Abstract
Amplifiers can be found in pipelined ADCs and pipelined-SAR ADCs as inter-stage amplifiers. The amplifiers can in some cases implement and provide gains in high speed track and hold circuits. The amplifier structures can be open-loop amplifiers, and the amplifier structures can be used in MDACs and samplers of high speed ADCs. The amplifiers can be employed without resetting, and with incomplete settling, to maximize their speed and minimize their power consumption. The amplifiers can be calibrated to improve performance.
Claims20
An open-loop amplifier, comprising:
- a differential pair of input transistors to receive differential inputs at respective gates of the differential pair of input transistors;
- a first current source to provide current for the open-loop amplifier;
- an active load at differential output nodes of the open-loop amplifier;
- and
- load resistance at the differential output nodes of the open-loop amplifier.
An open-loop amplifier, comprising:
- a first pair of input transistors to receive differential inputs at respective gates of the first pair of input transistors;
- a second pair of input transistors, which are complementary to the first pair of input transistors, to receive differential inputs at respective gates of the second pair of input transistors;
- a first current source at terminals of the first pair of input transistors to provide current for the open-loop amplifier;
- and
- load resistance at differential output nodes of the open-loop amplifier.
A method to improve performance of an open-loop amplifier, comprising:
- tracking one or more factors affecting an ideal gate-to-source voltage for operating a load transistor across differential output nodes of the open-loop amplifier in a linear region;
- and
- generating a gate voltage to drive load transistor based on the one or more factors and an ideal common-mode voltage.
Dependencies are inferred from the claim text.