Amplifier with increased gain stability
AssigneeQUALCOMM Incorporated
InventorsPingli HUANG, Lalitkumar NATHAWAD
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Abstract
Certain aspects of the present disclosure are directed towards an amplifier. The amplifier generally includes: a first input transistor with a source coupled to a first node; a second input transistor with a source coupled to a second node; at least one resistive element coupled between the first node and the second node; a first current mirror including a first set of transistors with gates coupled to a drain of the first input transistor, a drain of a transistor of the first set of transistors being coupled to the first node; and a second current mirror including a second set of transistors with gates coupled to a drain of the second input transistor, a drain of a transistor of the second set of transistors being coupled to the second node.
Claims20
An amplifier, comprising:
- a first input transistor with a source coupled to a first node;
- a second input transistor with a source coupled to a second node;
- at least one resistive element coupled between the first node and the second node;
- a first current mirror including a first set of transistors with gates coupled to a drain of the first input transistor, a drain of a transistor of the first set of transistors being coupled to the first node;
- and
- a second current mirror including a second set of transistors with gates coupled to a drain of the second input transistor, a drain of a transistor of the second set of transistors being coupled to the second node.
A method for signal amplification by an amplifier, comprising:
- receiving a first input signal at a gate of a first input transistor with a source coupled to a first node;
- receiving a second input signal at a gate of a second input transistor with a source coupled to a second node, the first input signal and the second input signal forming a differential signal pair;
- generating a first current from the first node to the second node based on the first input signal and the second input signal, wherein at least one resistive element is coupled between the first node and the second node;
- generating, via a transistor of a first set of transistors of a first current mirror coupled to the first input transistor, a second current to be provided to the first node based on the first input signal;
- and
- generating, via a transistor of a second set of transistors of a second current mirror coupled to the second input transistor, a third current to be provided to the second node based on the second input signal.
An electronic device, comprising:
- an analog-to-digital converter (ADC);
- and
- a residue amplifier configured to amplify a residue analog signal from the ADC, the residue amplifier including:
- a first input transistor with a source coupled to a first node;
- a second input transistor with a source coupled to a second node;
- at least one resistive element coupled between the first node and the second node;
- a first current mirror including a first set of transistors with gates coupled to a drain of the first input transistor, a drain of a transistor of the first set of transistors being coupled to the first node;
- and
- a second current mirror including a second set of transistors with gates coupled to a drain of the second input transistor, a drain of a transistor of the second set of transistors being coupled to the second node.
Dependencies are inferred from the claim text.