A D/A conversion circuit which can perform D/A conversion at high speed and with high precision is disclosed. The D/A conversion circuit comprises an analog reference power supply, an output buffer, a multiplexer, a pre-buffer, and a current changeover switch. The pre-buffer operates with a power supply...http://www.google.com.hk/patents/US6549196?utm_source=gb-gplus-share專利 US6549196 - D/A conversion circuit and liquid crystal display device
