公开(公告)号：US20200259311A1

公开(公告)日：2020-08-13

申请号：US16274261

申请日：2019-02-13

申请人： Semtech Corporation

发明人： Jonah Edward Nuttgens ,  James Stephen Mason

IPC分类号： H01S5/068 ,  H01L31/02 ,  H01L31/147 ,  G01J1/42 ,  G01J1/44

摘要： A photodiode current comparison circuit has a first current source coupled to a circuit node configurable to operate in a first mode, a second current source coupled to the circuit node configurable to operate in a second mode opposite the first mode, and a third current source switchable to route a current to the circuit node in response to a data signal using a transistor coupled between the circuit node and the third current source. A photodiode is coupled to the circuit node. In a first configuration, an anode of the photodiode is coupled to the circuit node and a cathode of the photodiode is coupled to a power supply terminal. In a second configuration, a cathode of the photodiode is coupled to the circuit node and an anode of the photodiode is coupled to a power supply terminal. An amplifier provides an error signal of the photodiode.

公开(公告)号：US10914627B2

公开(公告)日：2021-02-09

申请号：US16274261

申请日：2019-02-13

申请人： Semtech Corporation

发明人： Jonah Edward Nuttgens ,  James Stephen Mason

IPC分类号： G01J1/42 ,  G01J1/44 ,  H01L31/02 ,  H01L31/147 ,  H01S5/068 ,  H01S5/042

摘要： A photodiode current comparison circuit has a first current source coupled to a circuit node configurable to operate in a first mode, a second current source coupled to the circuit node configurable to operate in a second mode opposite the first mode, and a third current source switchable to route a current to the circuit node in response to a data signal using a transistor coupled between the circuit node and the third current source. A photodiode is coupled to the circuit node. In a first configuration, an anode of the photodiode is coupled to the circuit node and a cathode of the photodiode is coupled to a power supply terminal. In a second configuration, a cathode of the photodiode is coupled to the circuit node and an anode of the photodiode is coupled to a power supply terminal. An amplifier provides an error signal of the photodiode.

公开(公告)号：US10680715B1

公开(公告)日：2020-06-09

申请号：US16518582

申请日：2019-07-22

申请人： Semtech Corporation

发明人： Jonah Edward Nuttgens ,  Andrew Hana ,  James Stephen Mason

IPC分类号： H04B10/564 ,  H04B10/50 ,  H03M1/06

摘要： An OMA controller circuit utilizes a first ADC with an input coupled for receiving a residual error signal indicating a difference between a monitoring signal and a target data signal. A second ADC has an input coupled for receiving the target data signal. A first digital filter has an input coupled to an output of the first ADC, and a second digital filter has an input coupled to an output of the second ADC. A digital multiplier has a first input coupled to an output of the first digital filter and a second input coupled to an output of the second digital filter. An integrator has an input coupled to an output of the digital multiplier and an output providing an average error signal with sign and magnitude. The digital multiplier uses a four quadrant multiplier to perform a cross-correlation on the residual error and the target data signal.