Texas Instruments Corporation

Venkata Ramanan R

Nitin Kumar Agarwal

Kunal Suresh Karanjkar

Venkat Ramakrishna Saripalli

Per Torstein Roine

Srinivasa Chakravarthy

An example device includes: switch circuitry configured to: connect, in a first state based on a control signal, a first switch input to a first switch output and a second switch input to a second switch output; and connect, in a second state based on the control signal, the first switch input to the second switch output and the second switch input to the first switch output; an operational amplifier configured to: generate, in response to the control signal, a first voltage based on a gain and the connections in the first state; and generate, in response to the control signal, a second voltage based on the gain and the connections in the second state; and an Analog to Digital Converter (ADC) configured to convert the first voltage and the second voltage into a digital value based on a multiplication of the input voltage and the gain.

Methods and apparatus to reduce error in operational amplifiers

A circuit includes a first switch assembly having a first input node and a first output node, and a second switch assembly having a second input node and a second output node. The circuit further includes a third switch assembly an operational amplifier, and a buffer. The third switch assembly has a third input node and a third output node. The third input node is coupled to the second output node, and the third output node is coupled to the first output node. The buffer has a buffer input and a buffer output. The buffer input is coupled to an input stage of the operational amplifier. The buffer output is coupled to the third switch assembly.

Multi-channel multiplexer

In described examples, an amplifier can be arranged to generate a first stage output signal in response to an input signal. The input signal can be coupled to control a first current coupled from a first current source through a common node to generate the first stage output signal. A replica circuit can be arranged to generate a replica load signal in response to the input signal and in response to current received from the common node. A current switch can be arranged to selectively couple a second current from a second current source to the common node in response to the replica load signal.

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Venkata Ramanan R