| 摘要 |
<p>Disclosed is a printhead in which mixture of noise between the power supplies of analog and digital systems is suppressed, and a circuit for processing a small analog signal, e.g., temperature sensing circuit does not decrease in precision even for a high clock frequency. In the printhead including an element board (H1100) on which a digital circuit including a driver & heater array (101) and an analog circuit including a temperature sensing block (121) are formed by a semiconductor process, and an electrical circuit board (H1300) having a plurality of external input terminals (H1301) for inputting/outputting signals from/to the element board, the power supply (Vdd) of the digital circuit and the power supply (VddA) of the analog circuit are arranged apart from each other on the element board (H1100), and commonly connected to the other terminal of a capacitor (160) having one terminal grounded on the electrical circuit board (H1300). <IMAGE></p> |
