Patent ID: 7474978
Filing Date: 2009-01-06
Classification: H03F,H03G

Abstract:
1. An optical receiver, comprising: a photodetector configured to generate a current between first and second nodes in response to being illuminated with light, said photodetector being further configured to provide a parasitic capacitance between said first and second nodes; an amplifier having an input connected to said first node and an output connected to a third node, said amplifier being characterized by a frequency range over which said amplifier is to operate in a stable manner; a feedback path connecting said third node to said first node, said feedback path comprising a diode in series with a circuit element configured to have an impedance greater than a predetermined value, said diode being connected between first and fourth nodes; an output circuit connected to said fourth node, said output circuit providing an output signal to an external circuit, wherein said predetermined value depends on said frequency range and said parasitic capacitance; and a constant current source configured to cause a fixed current to flow through said transistor when said photodetector is not illuminated.