DIGITAL SELF-CALIBRATION FOR AUTOMATIC OFFSET CANCELLATION

    公开(公告)号:US20230179244A1

    公开(公告)日:2023-06-08

    申请号:US17457496

    申请日:2021-12-03

    CPC classification number: H04B1/16 H03F3/19 H04L27/06 H03F2200/451

    Abstract: A method for calibrating the DC operating point of a PWM receiver circuit is disclosed. The PWM receiving circuit includes an envelop detector having a first resistor string, and includes a bias circuit having a second resistor string and a plurality of switches. The second resistor string is coupled between a supply voltage and a reference voltage and functions as a voltage divider. Each switch, when closed, accesses a second voltage at a node of the second resistor string connected to the closed switch. To perform the calibration process, the plurality of switches is closed one at a time, and the second voltage is compared with a first voltage at a first node of the first resistor string. The switch that, when closed, produces the smallest difference between the first voltage and the second voltage remains closed after the calibration process, and is used for demodulating the PWM signal.

    Digital self-calibration for automatic offset cancellation

    公开(公告)号:US12081253B2

    公开(公告)日:2024-09-03

    申请号:US18352424

    申请日:2023-07-14

    CPC classification number: H04B1/16 H03F3/19 H03F3/245 H04L27/06 H03F2200/451

    Abstract: A method for calibrating the DC operating point of a PWM receiver circuit is disclosed. The PWM receiving circuit includes an envelope detector having a first resistor string, and includes a bias circuit having a second resistor string and a plurality of switches. The second resistor string is coupled between a supply voltage and a reference voltage and functions as a voltage divider. Each switch, when closed, accesses a second voltage at a node of the second resistor string connected to the closed switch. To perform the calibration process, the plurality of switches is closed one at a time, and the second voltage is compared with a first voltage at a first node of the first resistor string. The switch that, when closed, produces the smallest difference between the first voltage and the second voltage remains closed after the calibration process, and is used for demodulating the PWM signal.

    Digital self-calibration for automatic offset cancellation

    公开(公告)号:US11750234B2

    公开(公告)日:2023-09-05

    申请号:US17457496

    申请日:2021-12-03

    CPC classification number: H04B1/16 H03F3/19 H03F3/245 H04L27/06 H03F2200/451

    Abstract: A method for calibrating the DC operating point of a PWM receiver circuit is disclosed. The PWM receiving circuit includes an envelop detector having a first resistor string, and includes a bias circuit having a second resistor string and a plurality of switches. The second resistor string is coupled between a supply voltage and a reference voltage and functions as a voltage divider. Each switch, when closed, accesses a second voltage at a node of the second resistor string connected to the closed switch. To perform the calibration process, the plurality of switches is closed one at a time, and the second voltage is compared with a first voltage at a first node of the first resistor string. The switch that, when closed, produces the smallest difference between the first voltage and the second voltage remains closed after the calibration process, and is used for demodulating the PWM signal.

    DIGITAL SELF-CALIBRATION FOR AUTOMATIC OFFSET CANCELLATION

    公开(公告)号:US20230361796A1

    公开(公告)日:2023-11-09

    申请号:US18352424

    申请日:2023-07-14

    CPC classification number: H04B1/16 H04L27/06 H03F3/19 H03F3/245 H03F2200/451

    Abstract: A method for calibrating the DC operating point of a PWM receiver circuit is disclosed. The PWM receiving circuit includes an envelope detector having a first resistor string, and includes a bias circuit having a second resistor string and a plurality of switches. The second resistor string is coupled between a supply voltage and a reference voltage and functions as a voltage divider. Each switch, when closed, accesses a second voltage at a node of the second resistor string connected to the closed switch. To perform the calibration process, the plurality of switches is closed one at a time, and the second voltage is compared with a first voltage at a first node of the first resistor string. The switch that, when closed, produces the smallest difference between the first voltage and the second voltage remains closed after the calibration process, and is used for demodulating the PWM signal.

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