Amplifier with non-linearity cancellation
AssigneeHuawei Technologies Co., Ltd.
InventorYaqi Hu
Life of this patent
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Abstract
An amplifier circuit includes a primary differential amplifier circuit connected to receive a differential input and provide a primary differential output with a first non-linearity. A secondary differential amplifier circuit is connected to receive the differential input. The secondary differential amplifier circuit is configured to generate a secondary differential output with a second non-linearity. The secondary differential output and the primary differential output are coupled together with opposing polarities such that the second non-linearity cancels out at least the first non-linearity.
Claims17
An amplifier circuit, comprising:
- a first single-output amplifier stage having a first non-linearity;
- and
- a second single-output amplifier stage coupled to the first single-output amplifier stage, the second single-output amplifier stage having configurable non-linearity, the configurable non-linearity of the second single-output amplifier stage configured to cancel out at least a portion of the first non-linearity such that combined non-linearity of at least the first single-output amplifier stage and the second single-output amplifier stage in series is less than the first non-linearity, wherein the second single-output amplifier stage has a differential input and a single-output that is coupled to the first single-output amplifier stage.
A first single-output amplifier stage having a first non-linearity;
- and
- a second single-output amplifier stage coupled to the first single-output amplifier stage, the second single-output amplifier stage having configurable non-linearity, the configurable non-linearity of the second single-output amplifier stage configured to cancel out at least the first non-linearity such that combined non-linearity of at least the first single-output amplifier stage and the second single-output amplifier stage in series is less than the first non-linearity
- wherein the second single-output amplifier stage has a single input from the first single-output amplifier stage and wherein the second single-output amplifier stage includes a first transistor controlled by the single input and a configurable voltage source connected in series with the first transistor.
An amplifier circuit comprising:
- a first single-output amplifier stage having a first non-linearity;
- and
- a second single-output amplifier stage coupled in series with the first single-output amplifier stage, the second single-output amplifier stage having configurable non-linearity, the configurable non-linearity of the second single-output amplifier stage configured to cancel out at least the first non-linearity such that combined non-linearity of at least the first single-output amplifier stage and the second single-output amplifier stage in series is less than the first non-linearity wherein the second single-output amplifier stage has a differential input and a single-output that is coupled to the first single-output amplifier stage.
Dependencies are inferred from the claim text.