Transmitter and operating method of transmitter
AssigneeElectronics and Telecommunications Research Institute
InventorsMin-Hyung Cho, Young-deuk Jeon, In San Jeon, Jin Ho Han
Life of this patent
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Abstract
Disclosed is a transmitter which includes a channel driver that includes a pull-up transistor and a pull-down transistor connected between a power node and a ground node and outputs a voltage between the pull-up transistor and the pull-down transistor as a transmit signal, and a pre-driver that controls the pull-up transistor and the pull-down transistor in response to a driving signal and controls the channel driver such that the transmit signal is overshot at a rising edge of the driving signal and the transmit signal is undershot at a falling edge of the driving signal.
Claims19
A transmitter comprising:
- a channel driver including a pull-up transistor and a pull-down transistor connected between a power node and a ground node, and configured to output a voltage between the pull-up transistor and the pull-down transistor as a transmit signal;
- and
- a pre-driver configured to control the pull-up transistor and the pull-down transistor in response to a driving signal and to control the channel driver such that the transmit signal is overshot at a rising edge of the driving signal and the transmit signal is undershot at a falling edge of the driving signal,
- wherein the pre-driver causes the overshoot and the undershoot of the transmit signal by adjusting a level of a pull-up signal to be applied to the pull-up transistor,
- wherein the pre-driver adjusts the pull-up signal to a first level at the rising edge of the driving signal, and
- wherein the first level is two times a power supply voltage.
An operating method of a transmitter which includes a first transistor and a second transistor connected between a power node and a ground node and transmits a voltage between the first transistor and the second transistor, the method comprising:
- driving the first transistor with a first voltage in response to a first edge of a driving signal;
- driving the first transistor with a second voltage after a given time;
- and
- driving the first transistor with a third voltage in response to a second edge of the driving signal,
- wherein the second voltage is lower than the first voltage and is higher than the third voltage,
- wherein the first voltage is two times the second voltage.
A transmitter comprising:
- a pull-up transistor and a pull-down transistor connected between a power node and a ground node;
- a first voltage control circuit configured to receive a driving signal and to output one of a first voltage and a second voltage in response to the driving signal;
- a first transistor configured to output an output voltage of the first voltage control circuit to a gate of the pull-up transistor when the driving signal is at a first level;
- a second transistor configured to output a ground voltage to the gate of the pull-up transistor when the driving signal is at a second level;
- a second voltage control circuit configured to receive the driving signal and to output one of the first voltage and the second voltage in response to the driving signal;
- a third transistor configured to output an output voltage of the second voltage control circuit to a gate of the pull-down transistor when the driving signal is at the second level;
- and
- a fourth transistor configured to output the ground voltage to the gate of the pull-down transistor when the driving signal is at the first level,
- wherein the first voltage is two times the second voltage.
Dependencies are inferred from the claim text.