H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 1/66 (2006.01) H03K 17/041 (2006.01) H03K 17/042 (2006.01)
Patent
CA 2112070
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.
Sim & Mcburney
University Of Waterloo
LandOfFree
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