Logarithmic photodiode amplifier thesis

For dealing with FPN, there are many standard techniques available to cancel out FPN, either with a one-time calibration step or using adaptive techniques in real-time.

Logarithmic Amplifier

For applications in which only pixel intensity change is measured, however, FPN is a constant that may be subtracted out and is thus irrelevant. The figure below shows a typical logarithmic pixel circuit. Diode D1 is the photodiode that responds to light and sinks to ground an amount of current proportional to the light striking it.

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This current is typically in the nanoamp to picoamp range. Brighter light increases the current flowing through D1 and M1, which increases the voltage drop across M1 and lowers the resulting pixel voltage. Get Support.

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Op-Amp: Current to Voltage Converter (Transimpedance Amplifier) and it's applications

Open Access Article. This paper is expanded from the conference paper: Ni, Y. The transition point calculated from Equation 5 is at electrons, which fits well with this numeric solution. The linear—logarithmic transition points match well the values calculated from Equation 6.


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This new logarithmic pixel design uses charge domain logarithmic signal compression and charge-transfer-based signal readout. This structure gives a linear response in low light conditions and logarithmic response in high light conditions. The charge transfer readout efficiently suppresses the reset KTC noise by using true correlated double sampling CDS in low light conditions.

In high light conditions, thanks to charge domain logarithmic compression, it has been demonstrated that electrons should be enough to cover a dB dynamic range with a mobile phone camera-like signal-to-noise ratio SNR over the whole dynamic range. This low electron count permits the use of ultra-small floating diffusion capacitance sub-fF without charge overflow.

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