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US 12,744,503 B2Granted
Method for varying amplifier gain
AssigneeNokia Solutions and Networks Oy
InventorsLorenzo Iotti, Mark Ferriss, Alexander Rylyakov
Life of this patent
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Abstract
An apparatus, e.g., an optical signal receiver, includes a trans-impedance amplifier (TIA) circuit. The TIA circuit includes a variable gain amplifier (VGA) having a tunable tail current source. The TIA circuit is configured to tune the tail current source to stabilize a DC current to a load resistor of the VGA over an operating gain range of the TIA circuit.
Claims12
An apparatus, comprising:
- a trans-impedance amplifier (TIA) circuit comprising a variable gain amplifier (VGA);
- wherein the VGA comprises an amplification stage and a current steering structure to selectably steer a fraction of a current that is being output by the amplification stage to a load resistor;
- wherein the VGA is operable to cause the current steering structure to vary said fraction;
- and wherein the VGA is configured to tune a tail current source to stabilize a DC current to the load resistor of the VGA over an operating gain range of the TIA circuit.
1 more element
An apparatus, comprising:
- a trans-impedance amplifier (TIA) circuit comprising a variable gain amplifier (VGA), the VGA configured to tune a tail current source to stabilize a DC current to a load resistor of the VGA over an operating gain range of the TIA circuit;
- wherein the VGA is a differential VGA comprising two current-steering circuits connecting to a differential amplification stage, the differential amplification stage connecting to one or more variable current sources.
Dependencies are inferred from the claim text.