Low noise amplifier
First Claim
1. A low-noise amplifier circuit to convert a single-ended input into a dual-ended output, comprising:
- an input transconductance stage circuit, including a first MOS transistor coupled in parallel with a second MOS transistor;
a current buffer circuit, including a third MOS transistor coupled in parallel with a fourth MOS transistor;
each of the first, second, third, and fourth transistors having a body, gate, source, and drain;
the input transconductance stage circuit and the current buffer circuit being cascode coupled, forming a cascode amplifier configuration;
the single-ended input being at the source of one of the first and second transistors in the input transconductance stage circuit;
the dual-ended output being a differential output across the drain of the third transistor and the drain of the fourth transistor;
the first and second transistors of the input transconductance stage circuit being cross-coupled, wherein the body of the first transistor is coupled to the source of the second transistor, and the body of the second transistor is coupled to the source of the first transistor; and
the third and fourth transistors of the current buffer circuit being cross-coupled, wherein a first capacitance is coupled between the gate of the third transistor and the source of the fourth transistor, and a second capacitance is coupled between the gate of the fourth transistor and the source of the third transistor.
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Accused Products
Abstract
A low-noise amplifier circuit to convert a single-ended input into a dual-ended output includes an input transconductance stage circuit, including a first MOS transistor coupled in parallel with a second MOS transistor; a current buffer circuit, including a third MOS transistor coupled in parallel with a fourth MOS transistor; each of the first, second, third, and fourth transistors having a body, gate, source, and drain; the input transconductance stage circuit and the current buffer circuit being cascode coupled, forming a cascode amplifier configuration; the single-ended input being at the source of one of the first and second transistors in the input transconductance stage circuit; the dual-ended output being a differential output across the drain of the third transistor and the drain of the fourth transistor; the first and second transistors of the input transconductance stage circuit being cross-coupled, wherein the body of the first transistor is coupled to the source of the second transistor, and the body of the second transistor is coupled to the source of the first transistor; and the third and fourth transistors of the current buffer circuit being cross-coupled, wherein a first capacitance is coupled between the gate of the third transistor and the source of the fourth transistor, and a second capacitance is coupled between the gate of the fourth transistor and the source of the third transistor.
22 Citations
16 Claims
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1. A low-noise amplifier circuit to convert a single-ended input into a dual-ended output, comprising:
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an input transconductance stage circuit, including a first MOS transistor coupled in parallel with a second MOS transistor; a current buffer circuit, including a third MOS transistor coupled in parallel with a fourth MOS transistor; each of the first, second, third, and fourth transistors having a body, gate, source, and drain; the input transconductance stage circuit and the current buffer circuit being cascode coupled, forming a cascode amplifier configuration; the single-ended input being at the source of one of the first and second transistors in the input transconductance stage circuit; the dual-ended output being a differential output across the drain of the third transistor and the drain of the fourth transistor; the first and second transistors of the input transconductance stage circuit being cross-coupled, wherein the body of the first transistor is coupled to the source of the second transistor, and the body of the second transistor is coupled to the source of the first transistor; and the third and fourth transistors of the current buffer circuit being cross-coupled, wherein a first capacitance is coupled between the gate of the third transistor and the source of the fourth transistor, and a second capacitance is coupled between the gate of the fourth transistor and the source of the third transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A low-noise amplifier circuit to convert a single-ended input into a dual-ended output, comprising:
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an input transconductance stage circuit including first and second MOS transistors; a current buffer circuit including third and fourth MOS transistors; the input transconductance stage circuit and the current buffer circuit being cascode coupled and forming a cascode amplifier configuration; the first and second MOS transistors in the input transconductance stage circuit being cross-coupled, wherein a body of the first transistor is coupled to a source of the second transistor, and a body of the second transistor is coupled to a source of the first transistor; the third and fourth MOS transistors in the current buffer circuit being cross-coupled, wherein a first capacitance is coupled between a gate of the third transistor and a source of the fourth transistor, and a second capacitance is coupled between a gate of the fourth transistor and a source of the third transistor; the single-ended input being at the source of one of the first and second transistors; the dual-ended output being a differential output across a drain of the third MOS transistor in the current buffer circuit and a drain of the fourth MOS transistor in the current buffer circuit. - View Dependent Claims (13, 14, 15, 16)
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Specification