Gain stabilization
AssigneeQUALCOMM Incorporated
InventorsKentaro Yamamoto, Aram Akhavan, Ganesh Kiran, Lei Sun, Elias Dagher, Dinesh Jagannath Alladi
Life of this patent
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Abstract
An apparatus is disclosed for gain stabilization. In an example aspect, the apparatus includes an amplifier and a gain-stabilization circuit. The amplifier has a gain that is based on a bias voltage and an amplification control signal. The gain-stabilization circuit is coupled to the amplifier and includes a replica amplifier. The replica amplifier has a replica gain that is based on the bias voltage and the amplification control signal. The gain-stabilization circuit is configured to adjust at least one of the bias voltage or the amplification control signal based on a gain error associated with the replica amplifier.
Claims30
An apparatus comprising:
- a pipeline analog-to-digital converter comprising:
- at least two stages;
- and
- at least one amplification circuit coupled between the at least two stages, the at least one amplification circuit comprising:
- an amplifier having a gain that is based on a bias voltage and an amplification control signal;
- and
- a gain-stabilization circuit coupled to the amplifier, the gain-stabilization circuit comprising:
- a replica amplifier corresponding to the amplifier, the replica amplifier configured to have a replica gain that is based on the bias voltage and the amplification control signal,
- the gain-stabilization circuit configured to adjust at least one of the bias voltage or the amplification control signal based on a difference between an input voltage and an output voltage of the replica amplifier.
An apparatus comprising:
- a pipeline analog-to-digital converter comprising:
- at least two stages;
- and
- at least one amplification circuit coupled between the at least two stages, the at least one amplification circuit comprising:
- amplification means for providing a gain that is based on a bias voltage and an amplification control signal;
- and
- gain-stabilization means for substantially stabilizing the gain of the amplification means, the gain-stabilization means comprising:
- replication means for providing a replica gain that is based on the bias voltage and the amplification control signal;
- and
- means for adjusting at least one of the bias voltage or the amplification control signal based on a difference between an input voltage and an output voltage of the replication means.
A method for gain stabilization within at least one amplification circuit of a pipeline analog-to-digital converter, the at least one amplification circuit coupled between at least two stages of the pipeline analog-to-digital converter, the method comprising:
- amplifying an input signal using an amplifier of the at least one amplification circuit having a gain based on a bias voltage and an amplification control signal;
- amplifying a calibration input voltage using a replica amplifier of the at least one amplification circuit having a replica gain that is based on the bias voltage and the amplification control signal;
- and
- adjusting at least one of the bias voltage or the amplification control signal based on a difference between an input voltage and an output voltage of the replica amplifier.
An apparatus comprising:
- an amplifier having a gain that is based on a bias voltage and an amplification control signal;
- and
- a gain-stabilization circuit coupled to the amplifier and comprising:
- a gain-error correction circuit;
- and
- switching circuitry configured to selectively:
- provide an input signal to an input of the amplifier;
- or
- provide a calibration input voltage to the input of the amplifier and connect an output of the amplifier to the gain-error correction circuit,
- the gain-error correction circuit configured to determine a gain error associated with the amplifier based on the switching circuitry connecting the output of the amplifier to the gain-error correction circuit, the gain error representing a difference between the calibration input voltage and an output voltage of the amplifier,
- the gain-stabilization circuit configured to adjust at least one of the bias voltage or the amplification control signal based on the gain error.
Dependencies are inferred from the claim text.