US 10,454,418 B1Granted

Voltage-controlled oscillator with high and low gain options

AssigneeXilinx, Inc.

InventorsAnkur Jain, Jaeseo Lee, Richard W. Swanson

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Abstract

In an example, a voltage-controlled oscillator (VCO) includes: an oscillator having a supply input; and a voltage regulator, coupled to the supply input. The voltage regulator includes: a first transistor and a second transistor providing a first source-coupled transistor pair, and a third transistor and a fourth transistor providing a second source-coupled transistor pair; an active load coupled to drains of the first, second, third, and fourth transistors; a first current source coupled to sources of the first and second transistors, and a second current source coupled to sources of the third and fourth transistors; a fifth transistor having a source and a drain coupled to the source and the drain, respectively, of the first transistor; and a sixth transistor having a source and a drain coupled to the source and the drain, respectively, of the third transistor.

Claims19

Dependent claims

A voltage-controlled oscillator (VCO), comprising:

an oscillator having a supply input;
and
a voltage regulator, coupled to the supply input, the voltage regulator including:
a first transistor and a second transistor providing a first source-coupled transistor pair, and a third transistor and a fourth transistor providing a second source-coupled transistor pair;
an active load coupled to drains of the first, second, third, and fourth transistors;
a first current source coupled to sources of the first and second transistors, and a second current source coupled to sources of the third and fourth transistors;
a fifth transistor having a source and a drain coupled to the source and the drain, respectively, of the first transistor;
a sixth transistor having a source and a drain coupled to the source and the drain, respectively, of the third transistor;
a low-gain input coupled to a gate of each of the first and third transistors;
a high-gain input coupled to a gate of each of the fifth and sixth transistors;
and
a replica load coupled to a gate of the fourth transistor;
wherein a gate of the second transistor is coupled to the supply input of the oscillator.

10 more elements

Dependencies are inferred from the claim text.