Transimpedance amplifier protection circuits

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United States of America Patent

APP PUB NO 20070152136A1
SERIAL NO

11325477

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A TIA protection circuit comprises a TIA bias supply V.sub.TIA for applying a bias voltage to the TIA, an APD bias supply V.sub.APD for applying a bias voltage to an APD connected to an input of the TIA, and TIA protection means for reducing the bias voltage applied to the APD to a safe level when the power supplied to the TIA is removed so as to protect the input of the TIA from the application of an excessive voltage. This provides fast protection against high voltages to the input stage of a CMOS-based TIA that is simple and reliable in operation. Due to space limitations and power consumption constraints in small form factor pluggable modules, such as XFP and SFP modules, the circuit must be simple, small and require very low power. Several alternative protection schemes are possible, one using a circuit in parallel with the APD bias supply and one using circuit in series with the APD bias supply. The parallel protection scheme uses a fast switch in parallel with the APD bias supply so that, when the TIA bias voltage is turned off for any reason, the protection switch will connect the APD cathode (and TIA input) to ground (0V). In the serial protection scheme the protection switch is connected between the APD and APD bias supply so that, when the TIA bias voltage is turned off for any reason, the protection switch will isolate the APD cathode from the high voltage APD bias supply.

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Patent Owner(s)

Patent OwnerAddress
BOOKHAM TECHNOLOGY PLCNORTHHAMPTONSHIRE NN12 8EQ

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hagman, Matthew Ottawa, CA 1 8
Pan, Qi Didcot, GB 171 1555
Yao, Jianquo Didcot, GB 1 8

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