Patent ID: 6420988
Filing Date: 2002-07-16
Classification: G09G,H03M

Abstract:
A D/A converter circuit for converting â€œnâ€  bit digital data to analog signals, comprising:a switch which is controlled by respective bits of the lower â€œmâ€  bits of â€œnâ€  bit digital data (â€œmâ€  and â€œnâ€ : natural numbers, â€œmâ€ a capacitance, being a capacitance connected to each of said switches controlled by the respective bits of said lower â€œmâ€  bits, which is greater by 2mâˆ’1 times than the respective unit capacitance; a capacitance, being a capacitance connected to each of said switches controlled by the respective bits of said upper (â€œnâ€ âˆ’â€œmâ€ ) bits, which is greater by 2nâˆ’mâˆ’1 times than the respective unit capacitance; a coupling capacitance; and two reset switches; wherein two power sources and an offset power source are connected to said D/A converter circuit; said switches select either one of the two power sources; said two reset switches control charge of electric charges into said capacitance; and analog signals are outputted, with the potential of said offset power source used as a reference potential, from a common connection end of a capacitance of the upper (â€œnâ€ âˆ’â€œmâ€ ) bits of said â€œnâ€  bit digital video data.