Slew rate adjusting transmitter circuit

A transmitter circuit, comprising:

• a first capacitance having a first terminal and a second terminal, the second terminal of the first capacitance being electrically connected to a ground voltage;
• a first current pump circuit electrically connected to the first terminal of the first capacitance and configured to charge or discharge the first capacitance in accordance with a first input signal to allow the first terminal of the first capacitance to output a first voltage;
• a first voltage clamping circuit electrically connected to the first terminal of the first capacitance;
• a second voltage clamping circuit electrically connected to the first terminal of the first capacitance,
• wherein when the first current pump circuit charges the first capacitance according to the first input signal, the first terminal of the first capacitance outputs a first voltage, and when the first voltage reaches a high reference voltage, the second voltage clamping circuit performs voltage clamping such that the first voltage remains at the high reference voltage,
• wherein when the first current pump circuit discharges the first capacitance according to the first input signal, the first terminal of the first capacitance outputs the first voltage, and when the first voltage reaches a low reference voltage, the first voltage clamping circuit performs voltage clamping such that the first voltage remains at the low reference voltage,
• wherein a charging rate or a discharging rate at which the first current pump circuit charges or discharges the first capacitance determines a rising slew rate or a falling slew rate of the first voltage,
• and wherein when the first voltage reaches the low reference voltage or the high reference voltage, the first current pump circuit stops charging or discharging the first capacitance according to the voltage clamping of the first voltage clamping circuit or the second voltage clamping circuit.

A transmitter circuit, comprising:

• a first capacitance having a first terminal and a second terminal, the second terminal of the first capacitance being electrically connected to a ground voltage;
• a first current pump circuit electrically connected to the first terminal of the first capacitance and configured to charge or discharge the first capacitance in accordance with a first input signal to allow the first terminal of the first capacitance to output a first voltage, wherein the first voltage is between a low reference voltage and a high reference voltage;
• a second capacitance having a first terminal and a second terminal, the second terminal of the second capacitance being electrically connected to the ground voltage;
• a second current pump circuit electrically connected to the first terminal of the second capacitance and configured to charge or discharge the first capacitance in accordance with a second input signal to allow the first terminal of the second capacitance to output a second voltage, wherein the second voltage is between the low reference voltage and the high reference voltage,
• wherein a charging rate or a discharging rate at which the first current pump circuit charges or discharges the first capacitance determines arising slew rate or a falling slew rate of the first voltage,
• and wherein the charging rate or discharging rate at which the second current pump circuit charges or discharges the second capacitance determines the rising slew rate or falling slew rate of the second voltage.