Texas Instruments Corporation

Jafar Sadique Kaviladath

Neeraj Shrivastava

Visvesvaraya Appala Pentakota

Shagun Dusad

Himanshu Varshney

Supreet Joshi

A buffer circuit includes a first differential signal input, a second differential signal input, a first source follower circuit, and a second source follower circuit. The first source follower circuit includes a first signal output, and a first input transistor. The first input transistor is coupled to the first differential signal input, and is configured to drive the first signal output. The second source follower circuit includes a second signal output, a second input transistor, and a cascode transistor. The second input transistor is coupled to the second differential signal input, and is configured to drive the second signal output. The cascode transistor is coupled to the second input transistor and the first signal output, and is configured to compensate for non-linearity of the second input transistor based on an output signal provided at the first signal output.

Source follower with non-linearity cancellation

A circuit, which is usable in a flash analog-to-digital converter, includes a first switch configured to provide a first reference voltage to a first reference node responsive to a first control signal and a second switch configured to provide the first reference voltage to a second reference node responsive to a second control signal. A third switch is coupled to the first switch and is configured to provide a second reference voltage to the first reference node responsive to a clock signal. Further, a fourth switch is coupled to the second switch and configured to provide the second reference voltage to the second reference node responsive to the clock signal.

Reference voltage control circuit for a two-step flash analog-to-digital converter

In some examples, a system comprises an analog-to-digital converter (ADC) to receive an analog input signal and a reset signal, the ADC to convert the analog input signal into a digital signal. The system comprises a digital-to-analog converter (DAC), coupled to the ADC, to convert the digital signal into an internal analog signal. The system includes a first capacitor, coupled to the DAC, to receive the internal analog signal. The system comprises a first switch, coupled to the first capacitor, to provide the analog input signal to the first capacitor. The system comprises a second switch to couple the first capacitor to ground.

Analog-to-digital converter

The disclosure provides a current steering digital to analog converter (DAC) that includes a plurality of DAC elements. At least one DAC element of the plurality of DAC elements is coupled to a calibration circuit. The calibration circuit includes a fixed current source coupled to a primary node of the DAC element through a first estimation switch. A digital code generator is coupled to the primary node, and generates a first digital code corresponding to a primary voltage generated at the primary node. The digital code generator generates a second digital code. A correction DAC is coupled to the digital code generator and generates a bias voltage based on the second digital code. The bias voltage is provided to the DAC element such that a current flowing through each DAC element of the plurality of DAC elements is equal.

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Kozhikode, India

Jafar Sadique Kaviladath