Method for tia transimpedance control
AssigneeNokia Solutions and Networks Oy
InventorsLorenzo Lotti, Mark Ferriss, Alexander Rylyakov
Life of this patent
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Abstract
A transimpedance amplifier (TIA) includes a voltage amplifier and a first set of variable-resistors connected in parallel as a variable shunt feedback to the voltage amplifier. A control circuit is connected to control the variable resistors of the first set in a manner responsive to a TIA gain control voltage VGC. The control circuit includes a ramp generator and a reference set of variable-resistors connected in parallel. The ramp generator is configured to generate, responsive to an output voltage of the control circuit, a plurality of ramp voltages such that each of the voltages adjusts a corresponding one of the variable-resistors of the first set and of the reference set.
Claims14
An apparatus, comprising:
- a transimpedance amplifier (TIA) comprising:
- a voltage amplifier;
- and
- a first set of variable-resistors connected in parallel as a variable shunt feedback to the voltage amplifier;
- a control circuit connected to control the variable-resistors of the first set in a manner responsive to a TIA gain control voltage VGC, the control circuit comprising a reference set of variable-resistors connected in parallel;
- and
- a ramp generator configured to generate, responsive to an output voltage of the control circuit, a plurality of ramp voltages such that each of the voltages adjusts a corresponding one of the variable-resistors of the first set and the reference set.
Dependencies are inferred from the claim text.