Device comprising a symmetrical amplifier
AssigneeKoninklijke Philips Electronics N.V.
InventorStephane Bouvier
Life of this patent
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Abstract
This device finds interesting applications in the field of interface circuits for optical fibers. There is proposed in this circuit to utilize a symmetrical amplifier (19) to which an automatic gain control circuit (27) is added which is insensitive to variations of the offset voltage of this amplifier. This control circuit (27) comprises peak detectors which give the best results in a circuit of this type intended for processing signals at very high frequencies.
Claims3
A device comprising a symmetrical amplifier which has, inter alia, at least one input terminal for receiving a voltage to be amplified, a pair of output terminals for producing a symmetrical amplified voltage, and a symmetrical amplifier circuit having inputs for being connected to said input terminal, and outputs for being connected to said output terminals, and also a gain control for receiving a gain control signal, characterized in that said amplifier furthermore includes a circuit for measuring the amplitude of signals to produce said gain control signal, which circuit is formed by amplitude detectors of the same type, connected to produce measurements which represent the amplitude of electrical magnitudes at said output terminals.
Dependencies are inferred from the claim text.