D/A converter
AssigneeKawasaki Microelectronics, Inc.
InventorsMasayuki Ueno, Masatoshi Takada, Tatsuyuki Araki
Life of this patent
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Abstract
A high accuracy D/A converter includes D/A converter sections including 64 current cells for outputting a current corresponding to 1 LSB of 8-bit input data and a D/A converter section including 63 current cells, a reference current generating section for supplying the respective D/A converter sections with reference currents, and a decoder for activating each of the current cells from the D/A converter sections to the D/A converter section in the stated order in a cyclic manner when the 8-bit input data value is increased, and deactivating one each of the activated current cells from the D/A converter section to the D/A converter section in the stated order in a cyclic manner when the 8-bit input data value is decreased.
Claims5
A D/A converter, comprising:
- M number of D/A converter sections in which 2N−1 current cells, each current cell outputs a current corresponding to 1 LSB of N-bit input data upon activation are allocated by substantially the same number of the current cells, the D/A converter outputting an added value of currents output from activated current cells in respective D/A converter sections or outputting a voltage obtained by subjecting to voltage conversion the added value of the currents;
- a reference current generating section for supplying each of the D/A converter sections with a reference current;
- and
- a decoder for activating at least one current cell in D/A converter section, from the first to M-th D/A converter sections in sequence in a cyclic manner when a value of the N-bit input data is increased, and deactivating at least one activated current cell in D/A converter section from the M-th to first D/A converter sections in sequence in a cyclic manner when the value of the N-bit input data is decreased, wherein a maximum value of the number of the current cells to be continuously activated or continuously deactivated in the respective D/A converter sections is limited to a number smaller than the number of all the current cells in the respective D/A converter sections.
Dependencies are inferred from the claim text.