Optical receiver
AssigneeFirecomms Limited
InventorsPatrick MURPHY, Colm DONOVAN, Ciaran CAHILL
Life of this patent
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Abstract
A receiver has a differential transimpedance amplifier (4) with two inputs and two outputs. The differential transimpedance amplifier (4) provides a differential output and this is peak-detected (15, 16) to provide amplitude reference signals. The differential transimpedance amplifier output and the amplitude reference signals are fed to a differential summing amplifier (10), which provides a fully differential signal to a comparator, or to an automatic gain control circuit (5) to regulate the differential transimpedance amplifier gain. The differential summing amplifier (10) output is a fully differential signal, thereby having lower distortion for DC and burst mode receiver applications.
Claims15
An optical receiver comprising:
- a differential transimpedance amplifier TIA having input cascodes, and being arranged to receive one or more photodiode inputs and to provide at least two outputs, positive and negative,
- a positive peak detector receiving the positive differential TIA output, a negative peak detector receiving the negative differential TIA output, and each providing a peak detection output as an amplitude reference signal,
- a differential summing amplifier arranged to receive the outputs of the differential TIA and the amplitude reference signals from the peak detectors,
- wherein said differential summing amplifier directly or indirectly provides an output for the optical receiver,
- wherein the receiver further comprises an automatic gain circuit for the differential transimpedance amplifier, and wherein the differential summing amplifier is connected at its output to the automatic gain circuit.
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Dependencies are inferred from the claim text.