Degenerated transimpedance amplifier with wire-bonded photodiode for reducing group delay distortion
AssigneeInternational Business Machines Corporation
InventorsWooram Lee, Jonathan E. Proesel
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Abstract
An integrated circuit includes a degeneration network configured to improve group delay across one or more variations, wherein the degeneration network includes a transimpedance amplifier with one or more degeneration inductors. The transimpedance amplifier further includes one or more transistors, and the one or more degeneration inductors are connected after at least one emitter of the one or more transistors.
Claims12
A method for improving group delay across one or more variations corresponding to a transimpedance amplifier, the method comprising:
- producing a degeneration impedance by a degeneration inductor;
- wherein the transimpendance amplifier comprises an inverting amplifier including the degeneration inductor;
- monitoring the degeneration impedance through a tracking feedback loop;
- and
- adjusting an inductance of the degeneration inductor to alter the degeneration impedance in response to the one more variations;
- wherein the inverting amplifier comprises:
- a first transistor coupled to a positive voltage input;
- and
- a second transistor coupled to a negative voltage input;
- wherein the degeneration inductor is connected between emitters of the first and second transistors.
A method for improving group delay across one or more variations corresponding to a transimpedance amplifier, the method comprising:
- producing, by one or more inductors, a degeneration impedance;
- wherein the transimpendance amplifier comprises an inverting amplifier including the one or more inductors;
- monitoring the degeneration impedance;
- and
- adjusting an inductance of the one or more inductors to alter the degeneration impedance in response to the one more variations;
- wherein the inverting amplifier comprises:
- a first transistor coupled to a positive voltage input;
- and
- a second transistor coupled to a negative voltage input;
- wherein the one or more inductors are connected between emitters of the first and second transistors.
Dependencies are inferred from the claim text.