초록 ▼

The present invention relates to a D/A converter circuit which is capable of independently controlling the output voltage amplitude VOUT and the reference voltage. The D/A converter circuit converts "n" bit digital data ("n": natural number) to analog signals, wherein the respective bits of said "n"

The present invention relates to a D/A converter circuit which is capable of independently controlling the output voltage amplitude VOUT and the reference voltage. The D/A converter circuit converts "n" bit digital data ("n": natural number) to analog signals, wherein the respective bits of said "n" bit digital data control a switch, control charge and discharge of electric charges in the capacitance connected to said switch, and output analog signals with the offset potential used as a reference potential.

대표청구항 ▼

1. A D/A converter circuit for converting "n" bit digital data to analog signals, comprising:a switch which is controlled by respective bits of the lower "m" bits of "n" bit digital data ("m" and "n": natural numbers, "m"<"n"), and a switch which is controlled by respective bits of the upper ("n"-"m

1. A D/A converter circuit for converting "n" bit digital data to analog signals, comprising:a switch which is controlled by respective bits of the lower "m" bits of "n" bit digital data ("m" and "n": natural numbers, "m"<"n"), and a switch which is controlled by respective bits of the upper ("n"-"m") bits of "n" bit digital data; a capacitance, being a capacitance connected to each of said switches controlled by the respective bits of said lower "m" bits, which is greater by 2m-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 ("n"-"m") bits, which is greater by 2n-m-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 ("n"-"m") bits of said "n" bit digital video data.