公开(公告)号：US20240195375A1

公开(公告)日：2024-06-13

申请号：US18356519

申请日：2023-07-21

Applicant: Nokia Solutions and Networks Oy

Inventor： Lorenzo Lotti ,  Mark Ferriss ,  Alexander Rylyakov

IPC: H03G3/30 ,  H03F1/30 ,  H03F1/32 ,  H03F3/45 ,  H03G1/00

CPC classification number: H03G3/3084 ,  H03F1/301 ,  H03F1/3211 ,  H03F3/45475 ,  H03G1/0088

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.