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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
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.
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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
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.
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