Opitical detector with adjustable spectral response

摘要

An optical detector includes a first set of one or more photodiodes configured to generate a first photocurrent according to a first spectral response function of an incident light, a second set of one or more photodiodes configured to generate a second photocurrent according to a second spectral response function of the incident light, and a third set of one or more photodiodes configured to generate a third photocurrent according to a third spectral response function of the incident light. The optical detector further includes a module configured to output an indication of the intensity of the incident light according to a fourth spectral response function based on each of the first photocurrent, the second photocurrent, and the third photocurrent.

主权项

1. A method comprising:
receiving an indication of a first photocurrent from one or more photodiodes configured to generate the first photocurrent in response to an incident light according to a first spectral response function, wherein the one or more photodiodes configured to generate the first photocurrent include p-type substrates and n-type wells within the p-type substrates, and wherein the one or more photodiodes configured to generate the first photocurrent are unshielded from the incident light; receiving an indication of a second photocurrent from one or more photodiodes configured to generate the second photocurrent in response to the incident light according to a second spectral response function, wherein the second spectral response function is different from the first spectral response function, wherein the one or more photodiodes configured to generate the second photocurrent include p-type substrates, n-type wells within the p-type substrates, and p-type diffusions within the n-type wells and shorted to the n-type wells, and wherein the one or more photodiodes configured to generate the second photocurrent are unshielded from the incident light; receiving an indication of a third photocurrent from one or more photodiodes configured to generate the third photocurrent in response to the incident light according to a third spectral response function, wherein the third spectral response function is different from the first spectral response function and from the second spectral response function, wherein the one or more photodiodes configured to generate the third photocurrent include p-type substrates and n-type wells within the p-type substrates, and wherein the one or more photodiodes configured to generate the third photocurrent are shielded from the incident light; outputting an indication of the intensity of the incident light according to fourth spectral response function, wherein the indication of the intensity of the incident light is based on each of the first photocurrent, the second photocurrent, and the third photocurrent, wherein the fourth spectral response function is different from the first spectral response function, from the second spectral response function, and from the third spectral response function; and shorting p-type diffusions within n-type wells to the n-type wells of one or more photodiodes configured to generate the first photocurrent to reconfigure one or more photodiodes configured to generate the first photocurrent according to the first spectral response function as one or more photodiodes configured to generate the second photocurrent according to the second spectral response function.