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US 7,804,363 B2Granted
Open loop DC control for a transimpedance feedback amplifier
AssigneeMarvell International Ltd.
InventorThart Fah Voo
Life of this patent
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Abstract
A transimpedance amplifier having open-loop DC control is provided. The open-loop feedback control may provide a DC bias that is configurable based on the characteristics of an input device, such as, a photodiode or a magnetoresistor. The open-loop feedback control may provide quick recovery from voltage level variations and may provide stability for the amplifier.
Claims16
Control circuit for a transimpedance feedback amplifier, comprising:
- an open-loop DC control circuit in DC communication with a transimpedance feedback amplifier and that provides a DC bias voltage to the transimpedance feedback amplifier, wherein the DC bias voltage is adjusted using a variable current source.
A method for providing a control circuit for a transimpedance feedback amplifier, comprising:
- DC coupling an open-loop DC control circuit to the transimpedance feedback amplifier;
- generating a DC bias voltage using the open-loop DC control circuit;
- providing the DC bias voltage to the transimpedance feedback amplifier;
- and
- varying the DC bias voltage of the open-loop DC control circuit using a variable current source.
2 more elements
Dependencies are inferred from the claim text.