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US 10,541,654 B1Granted
Amplification with post-distortion compensation
AssigneeQUALCOMM Incorporated
InventorsMakar Snai, Ehab Abdel Ghany, Manohar Seetharam, Li-chung Chang
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Abstract
Amplification with post-distortion compensation is disclosed. In an example aspect, an apparatus includes a voltage rail and a cascode amplifier. The cascode amplifier includes an amplification node, a cascode node, and a common-source node. The cascode amplifier also includes at least one cascode transistor, an input transistor, and a compensation transistor. The cascode transistor is coupled between the amplification node and the cascode node. The input transistor is coupled between the cascode node and the common-source node. The compensation transistor is coupled between the voltage rail and the cascode node.
Claims29
An apparatus for amplification comprising:
- a voltage rail;
- and
- a cascode amplifier including:
- an amplification node;
- a cascode node;
- a common-source node;
- at least one cascode transistor coupled between the amplification node and the cascode node;
- an input transistor coupled between the cascode node and the common-source node;
- and
- a compensation transistor coupled between the voltage rail and the cascode node, the compensation transistor including a gate terminal, a source terminal, and a drain terminal, the compensation transistor comprising a diode-connected transistor in which the gate terminal is coupled to the drain terminal, the gate terminal and the drain terminal being coupled to the cascode node.
7 more elements
An apparatus for amplification comprising:
- an amplifier including:
- amplification circuitry configured to produce an amplified signal based on an input signal, the amplification circuitry including:
- a cascode node;
- input amplification circuitry coupled to the cascode node, the input amplification circuitry configured to accept the input signal and produce an input current at the cascode node based on the input signal;
- and
- cascode amplification circuitry coupled to the cascode node and configured to produce the amplified signal based on a cascode current at the cascode node;
- and
- compensation circuitry coupled to the cascode node, the compensation circuitry configured to produce a compensation current and apply the compensation current to the amplification circuitry via the cascode node to counteract a component of the input current the compensation circuitry including:
- compensation-current source circuitry configured to produce the compensation current and apply the compensation current to the amplification circuitry via the cascode node;
- and
- phase shift circuitry coupled to the compensation-current source circuitry and the input amplification circuitry.
8 more elements
An apparatus for amplification, comprising:
- an amplifier including:
- amplification circuitry configured to produce an amplified signal based on an input signal, the amplification circuitry including:
- a cascode node;
- input amplification circuitry coupled to the cascode node, the input amplification circuitry configured to accept the input signal and produce an input current at the cascode node based on the input signal;
- and
- cascode amplification circuitry coupled to the cascode node and configured to produce the amplified signal based on a cascode current at the cascode node;
- and
- compensation circuitry coupled to the cascode node, the compensation circuitry configured to produce a compensation current and apply the compensation current to the amplification circuitry via the cascode node to counteract a component of the input current,
- wherein the cascode amplification circuitry includes a regular cascode transistor coupled between an amplification node and the cascode node;
- and
- the compensation circuitry includes:
- a compensation cascode transistor coupled between the amplification node and the cascode node;
- and
- a controller coupled to the regular cascode transistor and the compensation cascode transistor, the controller configured to selectively disable the regular cascode transistor and enable the compensation cascode transistor responsive to activation of compensation functionality of the amplifier.
11 more elements
An amplifier comprising:
- amplification circuitry configured to produce an amplified signal based on an input signal, the amplification circuitry including:
- a cascode node;
- input amplification circuitry coupled to the cascode node, the input amplification circuitry configured to accept the input signal and produce an input current at the cascode node based on the input signal, the input current including a second-order input current;
- and
- cascode amplification circuitry coupled to the cascode node and configured to produce the amplified signal based on a cascode current at the cascode node;
- and
- compensation means for compensating for the second-order input current of the input amplification circuitry via the cascode node.
4 more elements
A method for amplification with post-distortion compensation, the method comprising:
- accepting an input signal at an input transistor;
- based on the input signal, producing an input current at a cascode node using the input transistor, the input current including a second-order input current;
- based on the input current, causing a cascode current at the cascode node using a cascode transistor;
- applying a compensation current at the cascode node to counteract the second-order input current;
- and
- producing an amplified signal based on the cascode current.
3 more elements
Dependencies are inferred from the claim text.