Transmitter based on RLM compensation and operating method thereof

A pulse amplitude modulation 4-level transmitter comprising:

• a driver including an edge driver configured to output a first signal and a fourth signal based on a selection drive signal and including an edge most significant bit (MSB) driver and an edge least significant bit (LSB) driver and a middle driver configured to output a second signal and a third signal based on the selection drive signal and one or more body bias voltages and including a middle MSB driver and a middle LSB driver;
• a body bias circuit configured to provide, to the middle driver, a first body bias voltage and a second body bias voltage based on a first body bias control signal;
• a control circuit configured to provide the selection drive signal to the driver and to transmit the first body bias control signal to the body bias circuit based on a first comparison result;
• and
• a comparator configured to provide the first comparison result of comparing a level of the second signal with a second level;
• wherein the first body bias voltage is applied to a transistor of the middle MSB driver, the second body bias voltage is applied to a transistor of the middle LSB driver, and
• wherein the driver is configured to select the middle MSB driver and the middle LSB driver based on the selection drive signal and to output the second signal based on the first body bias voltage and the second body bias voltage.

A pulse amplitude modulation 4-level transmitter comprising:

• a driver including an edge driver configured to output a first signal and a fourth signal based on a selection drive signal and including an edge most significant bit (MSB) driver and an edge least significant bit (LSB) driver and a middle driver configured to output a second signal and a third signal based on the selection drive signal and one or more body bias voltages and including a middle MSB driver and a middle LSB driver;
• a body bias circuit configured to provide, to the middle driver, a first body bias voltage and a second body bias voltage based on a body bias control signal;
• a control circuit configured to provide the selection drive signal to the driver and transmit the body bias control signal to the body bias circuit based on a comparison result;
• and
• a comparator configured to provide the comparison result of comparing a level of the third signal with a third level;
• wherein the first body bias voltage is applied to a transistor of the middle MSB driver, the second body bias voltage is applied to a transistor of the middle LSB driver, and
• wherein the driver is configured to select the middle MSB driver and the middle LSB driver based on the selection drive signal and to output the second signal based on the first body bias voltage and the second body bias voltage.