DAC current source with stabilizing bias

Details DAC current source with stabilizing bias DAC current source with stabilizing bias

1991-05-01

1993-12-21

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323312, 307568, G05F 316

Patent

active

052724328

ABSTRACT:
In a digital-to-analog converter (DAC) current source including a current mirror, an output transistor biased by a reference voltage and a steering transistor, a structure and a method are provided to implement the DAC current source without current spikes in the output current. Current spikes in the output current are avoided by including a transistor acting as a low-pass filter between the steering transistor and the output transistor. In one embodiment, the DAC current source circuit is implemented by PMOS transistors.

REFERENCES:
patent: 3932768 (1976-01-01), Takahashi et al.
patent: 4703250 (1987-10-01), Frappe
patent: 5105145 (1992-04-01), Neth

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