公开(公告)号：US20240195371A1

公开(公告)日：2024-06-13

申请号：US18356608

申请日：2023-07-21

申请人： Nokia Solutions and Networks Oy

发明人： Mark Ferriss ,  Lorenzo Iotti ,  Alexander Rylyakov

IPC分类号： H03F3/45 ,  G05F1/56

CPC分类号： H03F3/45475 ,  G05F1/56 ,  H03F2200/129

摘要： An apparatus, such as a coherent optical receiver, includes a trans-impedance amplifier (TIA) and a low dropout (LDO) voltage regulator circuit for providing a supply voltage to the TIA. The LDO circuit is configured to adjust the supply voltage responsive to a DC voltage at an output of the TIA. In some implementations the LDO circuit may provide only a fraction of a supply current to the TIA, with another fraction provided by a partial current replica source.

公开(公告)号：US20240195364A1

公开(公告)日：2024-06-13

申请号：US18356576

申请日：2023-07-21

申请人： Nokia Solutions and Networks Oy

发明人： Mark Ferriss ,  Lorenzo Iotti ,  Alexander Rylyakov

IPC分类号： H03F1/52 ,  H03F3/45

CPC分类号： H03F1/52 ,  H03F3/45475 ,  H03F2200/426

摘要： 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.

公开(公告)号：US20240195374A1

公开(公告)日：2024-06-13

申请号：US18356478

申请日：2023-07-21

申请人： Nokia Solutions and Networks Oy

发明人： Lorenzo Iotti ,  Mark Ferriss ,  Alexander Rylyakov

IPC分类号： H03G3/30 ,  H03F3/45

CPC分类号： H03G3/30 ,  H03F3/45197 ,  H03G2201/103

摘要： 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.

公开(公告)号：US20240195375A1

公开(公告)日：2024-06-13

申请号：US18356519

申请日：2023-07-21

申请人： Nokia Solutions and Networks Oy

发明人： Lorenzo Lotti ,  Mark Ferriss ,  Alexander Rylyakov

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

CPC分类号： H03G3/3084 ,  H03F1/301 ,  H03F1/3211 ,  H03F3/45475 ,  H03G1/0088

摘要： 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.

公开(公告)号：US20240195373A1

公开(公告)日：2024-06-13

申请号：US18356462

申请日：2023-07-21

申请人： Nokia Solutions and Networks Oy

发明人： Lorenzo Iotti ,  Mark Ferriss ,  Alexander Rylyakov

IPC分类号： H03G3/30 ,  H03F3/45

CPC分类号： H03G3/30 ,  H03F3/45475 ,  H03G2201/103

摘要： An apparatus, such as a coherent optical receiver, includes a TIA, the TIA including a cascode circuit having a cascode node. A first tunable element is connected to tunably shunt the cascode node to vary a voltage gain of the TIA, e.g., up to a first amount. Implementations of the TIA further include another tunable element connected to vary a load of the cascode circuit to vary the voltage gain, e.g., up to a second amount. A current steering circuit may be provided to vary the voltage gain up to a third amount, each of the amounts being only a fraction of a target voltage gain variation of the TIA.