Drive circuit board and liquid ejection apparatus

A liquid ejection apparatus comprising:

• a drive circuit board configured to output a drive signal for driving a capacitive load;
• and
• a print head configured to eject a liquid by driving the capacitive load, wherein
• the drive circuit board includes:
• a drive circuit configured to output the drive signal corresponding to a base drive signal;
• and
• a wiring board provided with the drive circuit,
• the drive circuit includes:
• a first switching circuit including a first driver circuit configured to output a first drive signal corresponding to the base drive signal and a first switching element pair that is driven in accordance with the first drive signal to output a first switching signal;
• a second switching circuit including a second driver circuit configured to output a second drive signal corresponding to the base drive signal and a second switching element pair that is driven in accordance with the second drive signal to output a second switching signal corresponding to the first switching signal;
• a smoothing circuit configured to smooth the second switching signal and output the second switching signal thus smoothed as the drive signal;
• and
• a bootstrap circuit that includes a first capacitor and a diode, and is configured to shift a level of a voltage value of a power supply voltage to be supplied to the first switching element pair in accordance with the first switching signal, and then supply the power supply voltage the level of which is shifted to the second switching element,
• the first capacitor is located at a first position on the drive circuit board, the first switching element pair is located at a second position on the drive circuit board, and the second switching element pair is located at a third position on the drive circuit board, and
• a shortest distance on the drive circuit board between the first position and the second position is longer than a shortest distance on the drive circuit board between the first position and the third position.