US 12,328,102 B2 · Methods and apparatus to improve performance of amplifiers

Abstract

An example apparatus includes: An amplifier comprising folded cascode circuitry having an input and an output, an input pair coupled to the input, clamp circuitry including: a first transistor having a first drain, a first source, and a first gate, the first source coupled to the output, a second transistor having a second drain, a second source, and a second gate, the second drain coupled to the first drain and the second gate coupled to the first drain and second drain, a third transistor having a third drain, a third source, and a third gate, the third source coupled to the output, and a fourth transistor having a fourth drain, a fourth source, and a fourth gate, the fourth drain coupled to the third drain and the fourth gate coupled to the third drain and the fourth drain.

Claims19

Dependent claims

An amplifier comprising:

folded cascode circuitry having an input and an output;
an input pair of transistors coupled to the input;
and
clamp circuitry including:
a first transistor having a first drain, a first source, and a first gate, the first source coupled to the output;
a second transistor having a second drain, a second source, and a second gate, the second drain coupled to the first drain and the second gate coupled to the first drain and second drain;
a third transistor having a third drain, a third source, and a third gate, the third source coupled to the output;
and
a fourth transistor having a fourth drain, a fourth source, and a fourth gate, the fourth drain coupled to the third drain and the fourth gate coupled to the third drain and the fourth drain.

6 more elements

An amplifier comprising:

folded cascode circuitry having an input and an output;
a first pair of input transistors coupled to the input;
a second pair of input transistors coupled to the input;
and
clamp circuitry including:
a first transistor having a first current terminal, a second current terminal, and a first control terminal, the second current terminal coupled to the output;
a second transistor having a third current terminal, a fourth current terminal, and a second control terminal, the third current terminal coupled to the first current terminal and the second control terminal coupled to the first current terminal and third current terminal;
a third transistor having a fifth current terminal, a sixth current terminal, and a third control terminal, the fifth current terminal coupled to the output;
and
a fourth transistor having a seventh current terminal, an eighth current terminal, and a fourth control terminal, the seventh current terminal coupled to the fifth current terminal and the fourth control terminal coupled to the fifth current terminal and the seventh current terminal.

7 more elements

Dependencies are inferred from the claim text.

Methods and apparatus to improve performance of amplifiers

Life of this patent

Methods and apparatus to improve performance of amplifiers

Life of this patent

Abstract

Claims19