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1. (WO2019050651) APPLICATION FRONTALE À FAIBLE BRUIT POUR MONITEUR DE FRÉQUENCE CARDIAQUE UTILISANT LA PHOTOPLÉTHYSMOGRAPHIE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

What is claimed is:

1. An apparatus comprising:

an amplifier;

a first current source;

a first pair of resistors coupled to the first current source and the amplifier;

a pair of devices coupled to the first pair of resistors;

a photo-diode coupled to the pair of devices;

a second pair of resistors coupled to the pair of devices and the photo-diode; and a second current source coupled to the second pair of resistors.

2. The apparatus of claim 1, wherein the amplifier comprises a first input coupled to a first resistor of the first pair and to a first device of the pair of devices.

3. The apparatus of claim 2, wherein the amplifier comprises a second input coupled to a second resistor of the first pair and to a second device of the pair of devices.

4. The apparatus of claim 3, wherein the amplifier comprises a first output coupled to a third resistor, and wherein the third resistor is coupled to the first input of the amplifier.

5. The apparatus of claim 3, wherein the amplifier comprises a second output coupled to a fourth resistor, and wherein the fourth resistor is coupled to the second input of the amplifier.

6. The apparatus of claim 1, wherein the first current source comprises a p-type transistor.

7. The apparatus of claim 1, wherein the second current source comprises an n-type

transistor.

8. The apparatus of claim 1, wherein the pair of devices comprises common-gate amplifiers.

9. The apparatus of claim 1, wherein the amplifier comprises a transimpedance amplifier.

10. An apparatus comprising:

an amplifier having an input and an output;

a resistor coupled to the input and the output of the amplifier;

a first current source coupled to the input of amplifier;

a second current source;

a cascode device coupled to the first and second current sources; and

a photo-diode coupled to the cascode device and the second current source.

11. The apparatus of claim 10, wherein the amplifier comprises a transimpedance amplifier.

12. The apparatus of claim 10, wherein the cascode device comprises a common-gate

amplifier.

13. The apparatus of claim 10, wherein the first current source comprises a p-type transistor, and wherein the second current source comprises an n-type transistor.

14. A wearable device comprising:

a first current source to detect a light from a media;

a cascode device coupled in series with the current source;

a second current source coupled in series with the cascode device;

an amplifier coupled to the second current source and the cascode device, wherein the amplifier is to provide an output; and

an intellectual property (IP) block to receive a filtered version of the output of the amplifier and to determine a condition of the media according to the output of the amplifier.

15. The wearable device of claim 14, comprises a wireless interface to allow the IP block to communicate with another device.

16. The wearable device of claim 14 comprises:

a level shifter to level shift the output to a lower voltage level; and

a track-and-hold circuit to track the level-shifted output voltage and then to hold it.

17. The wearable device of claim 16 comprises a gain stage with a low pass filter, wherein the gain stage is to amplify the output of the track-and-hold circuit and is to filter the amplified output.

18. The wearable device of claim 17 comprises an analog-to-digital converter to convert the filtered amplified output to a digital representation which is the filtered version of the output voltage provided to the IP block.

19. The wearable device of claim 14 comprises a light source driver, wherein the IP block is operable to adjust intensity of the light emitted by the light source by controlling the light source driver.

20. The wearable device of claim 14, wherein the media is part of a living body, and wherein the condition is a heartbeat.

21. The wearable device of claim 14, wherein the first current source comprises a photodiode coupled in parallel to an n-type device.

22. A system comprising: a memory, a processor coupled to a memory, the processor

including an apparatus according to any one of claims 1 to 9; a wireless interface to allow the processor to communicate with another device.

23. A system comprising: a memory, a processor coupled to a memory, the processor

including an apparatus according to any one of claims 10 to 13; and a wireless interface to allow the processor to communicate with another device.