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US 12,738,899 B2Granted
Transconductor with current limiter
AssigneeNokia Solutions and Networks Oy
InventorsMark Ferriss, Lorenzo Iotti, Alexander Rylyakov
Life of this patent
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Abstract
An apparatus, such as a coherent optical receiver, includes a transimpedance amplifier (TIA) with differential outputs, and a multi-tanh type current limiter connected across the differential outputs of the transimpedance amplifier. The multi-tanh type current limiter includes two tanh-type current limiters shifted in voltage and connected to subtract an output current thereof from an output current of the TIA.
Claims8
An apparatus comprising:
- a transimpedance amplifier (TIA) with differential outputs;
- and
- a multi-tanh type current limiter connected across the differential outputs of the transimpedance amplifier, wherein the multi-tanh type current limiter comprises first and second tanh-type current limiters connected to subtract an output current thereof from an output current of the TIA, wherein the first and second tanh-type current limiters are biased to be shifted in voltage, and
- wherein the TIA includes a degenerated transistor pair at an output thereof.
1 more element
Dependencies are inferred from the claim text.