公开(公告)号：US20230238930A1

公开(公告)日：2023-07-27

申请号：US17648897

申请日：2022-01-25

申请人： Semtech Corporation

发明人： Christopher John BORN ,  Matthew George HAGMAN ,  Darrell Iaian SMITH

IPC分类号： H03F3/45 ,  H03G3/30 ,  H04B10/67

CPC分类号： H03F3/45475 ,  H03G3/3036 ,  H04B10/673 ,  H03G2201/103 ,  H03F2200/372

摘要： A transimpedance amplifier (TIA) for converting an input current at an input node into an output voltage at an output node, the TIA comprising: a first amplifier stage having a first input coupled to the input node and a first output; a feedback path between the first output and the first input; a second amplifier stage in the feedback path having a second input, the second input coupled to the first output of the first amplifier stage; a feedback resistor in the feedback path coupled between an output of the second amplifier stage and first input of the first amplifier stage; and an output stage, comprising: a load resistor coupled between a reference voltage node and a T-coil, the T-coil comprising first and second inductors coupled in series at an inductor node, the T-coil coupled between the first output and the load resistor, the inductor node coupled to the output node of the TIA.

公开(公告)号：US20240356504A1

公开(公告)日：2024-10-24

申请号：US18303331

申请日：2023-04-19

申请人： Semtech Corporation

发明人： Behzad FARZANEH ,  Matthew George HAGMAN ,  Christopher John BORN

IPC分类号： H03F3/45 ,  H03F1/32 ,  H04B10/60

CPC分类号： H03F3/4508 ,  H03F1/32 ,  H04B10/60

摘要： This application relates to transimpedance amplifiers (TIAs), in particular to TIAs with wideband feedback. The TIA has an input stage, for receiving an input current and outputting a corresponding output voltage, with a first transistor configured as an input transistor in a first circuit branch. A reference controller is configured to provide a reference voltage with a value equal to a DC value of the output voltage and a voltage regulator is configured to receive a supply voltage and generate a regulated voltage with a voltage offset to the reference voltage, such that the voltage offset does not substantially vary with variation in at least one of the supply voltage, temperature and process variations. The regulated voltage is supplied as a supply voltage to the input stage. The TIA also includes control circuitry for controlling an effective transconductance of the first transistor to a defined value.

公开(公告)号：US20230246603A1

公开(公告)日：2023-08-03

申请号：US17591208

申请日：2022-02-02

申请人： Semtech Corporation

发明人： Matthew George HAGMAN ,  Behzad FARZANEH

IPC分类号： H03F3/08 ,  H03G3/30

CPC分类号： H03F3/087 ,  H03G3/3084

摘要： This application relates to transimpedance amplifier (TIA) apparatus, in particular to a TIA apparatus suitable for receiving data using burst mode communication. The apparatus has a transimpedance amplifier configured to generate a first voltage based on a current at an input node for an input signal. A controlled voltage source, such as a dummy TIA, generates a second voltage based on a first control current. A controller is configured to collectively control the first control current and a second control current based on an indication of input signal magnitude. The first control current controls the second voltage which may be used as a slicing level. The second control current is subtracted from the current at the input node and can provide a DC restore current.