Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1993-12-22
1996-08-20
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341133, 327433, H03M 166
Patent
active
055482880
ABSTRACT:
An improved current cell and current switch is described for use in digital-to-analog converters and other current mode circuits. The current switch is implemented using BiCMOS circuitry which is characterized by an absence of base current error and a switching speed which is approximately twice as fast as the switching speed of prior art MOS-based switches. According to one embodiment, the current cell is implemented in BiCMOS which offers higher output resistance, smaller minimum voltage, and improved accuracy over prior art MOS-based self-calibrated current cells. According to another embodiment, the current cell is implemented in CMOS and is characterized by a significant reduction in charge injection, leakage current and error due to coupling of the cell output voltage back to the storage node, as compared with prior art MOS-based current cells. Furthermore, a current-steering digital-to-analog converter is described which incorporates the improved current cell and current switch of the present invention.
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University of Waterloo
Williams Howard L.
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