Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1993-06-10
1995-03-28
Logan, Sharon D.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341118, H03M 178, H03M 106
Patent
active
054021278
ABSTRACT:
A digital-to-analog converter (i.e., D/A converter) formed on a wafer comprises a decoder, transistors (e.g., field-effect transistors) and resistors. Since the wafer provides a gap between the p-well region and the n-well region, the resistance values of the resistors formed on the p-well region differ from those of the resistors formed on the n-well region. In order to cancel such difference between the resistance values, there are provided two series of resistors in parallel between a power-applying terminal and a ground terminal, wherein each of two series of resistors contain two kinds of resistors respectively formed on the p-well region and the n-well region, while a midpoint of the first series of resistors is connected with a midpoint of the second series of resistors. Due to the direct connection between two midpoints, the potential applied to these midpoints are stabilized and set at the certain fixed voltage. Thus, it is possible to obtain a desirable precision for the linear digital-to-analog conversion characteristic of the D/A converter, regardless of the difference between the resistance values of the resistors respectively formed on the p-well region and n-well region on the wafer.
REFERENCES:
patent: 4338591 (1982-07-01), Tuthill
patent: 4591826 (1986-05-01), Seiler
patent: 4983973 (1991-01-01), Lewyn
patent: 5111205 (1992-05-01), Morlon
Logan Sharon D.
Yamaha Corporation
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