Texas Instruments Corporation

Wen Li

Srinath Mathur Ramaswamy

Arup Polley

Liming Xiu

Sriram Narayanan

Ajit Sharma

Seung Bae Lee

Xiaopeng Li

The circuitry of an optical receiver reduces the ambient DC component and the pleth DC component to leave a pleth signal with substantially only a pleth AC component. The circuitry also provides gain control and can provide transmit power control to change the range of the pleth AC component to occupy a desired input range of an analog-to-digital converter.

Optical receiver chain for components of a photoplethysmograph signal

A method and apparatus for a digital video display. A digital display device receives an analog signal representing an image formed of pixels in video lines and a signal containing a synchronization waveform for the image. An analog-to-digital converter (ADC) receives the analog signal and converts it to a sampled digital waveform. A phase-locked loop including a programmable frequency divider controls the sampling time for the ADC. The programmable frequency divider is controlled by a dividing-ratio algorithm that selects a dividing ratio, measures the number of pixels in a video line using the dividing ratio, and recomputes the dividing ratio by multiplying the selected dividing ratio by the expected number of pixels in a video line and dividing by the measured number of pixels. The sampling phase for the ADC is selected by a sampling-phase control algorithm that minimizes a function representative of the flatness of the sampled digital waveform.

Method and apparatus for a digital display

Growing community of inventors

McKinney, TX, United States of America

Wen Li