Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1996-04-18
1998-07-14
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341133, H03M 178
Patent
active
057811407
ABSTRACT:
The two-segment ladder circuit disclosed comprises a front-end resistor for reducing a reference voltage to an internal voltage, a resistor network for receiving the internal voltage and generating a plurality of branch currents having magnitude that form a decreasing geometrical series with a ratio of 1/2, and a resistor for terminating the resistor network. The terminating resistor and resistors of the resistor network can be diffused resistors or well resistors, which require less chip area. In addition, the front-end resistor can be a polysilicon resistor, which is capable of withstanding the high reference voltage and has less resistance variation according to the voltage across it. The two-segment ladder circuit can be used as a building block for a digital-to-analog converters.
REFERENCES:
patent: 3728719 (1973-04-01), Fish
patent: 4804940 (1989-02-01), Takigawa et al.
patent: 4864304 (1989-09-01), Shigehara et al.
patent: 4891645 (1990-01-01), Lewis et al.
patent: 5119095 (1992-06-01), Asazawa
patent: 5134456 (1992-07-01), Kobatake
patent: 5212484 (1993-05-01), Hillis
patent: 5691721 (1997-11-01), Kim
Hoff Marc S.
Industrial Technology Research Institute
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