Electric circuit board and liquid ejection head

A liquid ejection head comprising:

• an electric circuit board including
• a booster circuit configured to generate a pump drive signal having a pump drive voltage for driving a circulating pump to circulate a liquid, by boosting a pump reference signal having a reference voltage based on a booster circuit drive signal,
• a first wiring for transmitting the pump drive signal,
• a second wiring for transmitting the pump reference signal,
• a third wiring for transmitting the booster circuit drive signal, and
• a plurality of fourth wirings for transmitting signals related to an ejection element configured to eject the liquid, wherein
• the second wiring and the third wiring each have a portion disposed at a position spaced apart from the first wiring by a distance shorter than a protection distance, and have a short circuit protection circuit connected thereto, and
• the plurality of fourth wirings include one or more first type wirings disposed at a position spaced apart from the first wiring by a distance longer than the protection distance;
• a liquid circulation unit including the circulating pump;
• and
• an ejection unit having a plurality of the ejection elements configured to eject a liquid supplied from the liquid circulation unit.