Amplifiers
AssigneeNXP B.V.
InventorMike Splithof
Life of this patent
Estimating the term…
Abstract
A chopper amplifier and method of operation are described. The chopper amplifier comprises a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency. An amplification stage has an input arranged to receive the chopped signal and an output, and supplies an amplified signal at the output. An output chopper is arranged to integrate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal. The amplification stage is further configured to filter the chopped signal to attenuate signal components having frequencies lower than the chopper frequency.
Claims14
A chopper amplifier, comprising:
- a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency and to output a chopped signal;
- an amplification stage having an input configured to receive the chopped signal and an output,
- wherein the amplification stage is configured to supply an amplified signal at the output;
- and
- an output chopper configured to integrate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal,
- wherein the amplification stage is further configured to filter the signal passing through the amplification stage to attenuate signal components having frequencies lower than the chopper frequency;
- wherein the amplification stage includes a main amplifier and a filter attached to an input of the main amplifier or a filter attached to an output of the main amplifier;
- and
- wherein the main amplifier comprises a cascade of a voltage-to-current converter and a current-to-voltage converter.
A chopper amplifier, comprising:
- a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency and to output a chopped signal;
- an amplification stage having an input configured to receive the chopped signal and an output,
- wherein the amplification stage is configured to supply an amplified signal at the output;
- and
- an output chopper configured to integrate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal,
- wherein the amplification stage is further configured to filter the signal passing through the amplification stage to attenuate signal components having frequencies lower than the chopper frequency;
- wherein the amplification stage includes a main amplifier and a filter attached to an input of the main amplifier or a filter attached to an output of the main amplifier;
- and
- wherein the amplification stage further comprises a differential mode amplifier connected to the main amplifier and configured to govern a common mode rejection performance of the amplification stage.
A chopper amplifier, comprising:
- a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency and to output a chopped signal;
- an amplification stage having an input configured to receive the chopped signal and an output,
- wherein the amplification stage is configured to supply an amplified signal at the output;
- and
- an output chopper configured to integrate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal,
- wherein the amplification stage is further configured to filter the signal passing through the amplification stage to attenuate signal components having frequencies lower than the chopper frequency;
- wherein the amplification stage includes a main amplifier and a filter attached to an input of the main amplifier or a filter attached to an output of the main amplifier;
- and
- wherein the amplification stage further comprises a common mode amplifier connected to the main amplifier and configured to define the common mode output voltage of the main amplifier.
Dependencies are inferred from the claim text.