Apparatus and methods for generating an electronic signal responsive to selected light

Apparatus for generating an electronic signal in response to light, comprising:

• a first photodiode for converting light to a corresponding first electronic signal;
• a second photodiode for converting the light to a corresponding second electronic signal;
• a circuit for manipulating the first and second electronic signals to generate an output signal in response to the light;
• one of either the first silicon photodiode or the second photodiode having an optical thickness of about 7.0 micrometers;
• and
• and the other silicon photodiode having an optical thickness of about 3.5 micrometers;
• further comprising a circuit operable to multiply the first electronic signal by the ratio of the optical thicknesses of the second photodiode to the first photodiode to obtain a first product;
• and thereafter, the circuit operable to subtract the second electronic signal from the first product, so as to obtain a reduced lone wavelength response in the near infra-red and a resultant spectral response similar to a human eye.