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22 April 2006 A new CMOS electro-optical modulator based on the charge pumping phenomenon
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In this paper, we report on a new type of CMOS electro-optical modulator (EOM), called Photonic Mixer Device (PMD), based on the Charge Pumping (CP) phenomenon, which is capable of mixing and accumulating photo-generated charge-packets synchronously with respect to a pulsed light source. The device uses two PMOS transistors with embedded photodiode to detect the intensity and phase of a modulated light signal. Using clocking between accumulation and inversion, the two transistors transfer to output charge packets which are synchronized and proportional to the light intensity. The device operates at 3.3V with no dc power consumption and is implemented in a standard 0.35μm CMOS process. Using a 1.5mW/cm2 light source pulsed at 25KHz, the device estimates a phase delay with an accuracy of 0.8%.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nicola Massari and Massimo Gottardi "A new CMOS electro-optical modulator based on the charge pumping phenomenon", Proc. SPIE 6189, Optical Sensing II, 61890A (22 April 2006);

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