Digital-to-analog converter with programmable current control

Details Digital-to-analog converter with programmable current control Digital-to-analog converter with programmable current control

2006-10-31

2006-10-31

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

C341S135000, C341S144000

Reexamination Certificate

active

07129871

ABSTRACT:
A wide gain range current digital-to-analog converter (DAC) is presented that includes a unit current cell having a current source module biased by a current source voltage bias, a differential switch module, a main cascode module biased by a first bias voltage and an attenuation cascode module biased by a second bias voltage, configured such that a particular current gain range is obtained at the main cascode module output when a unit current cell current is at or above a current threshold. The output current at the attenuation cascode module output can be input into a current attenuator when the unit current cell current is below the current threshold to obtain additional current gain range. The current attenuator can include a plurality of attenuator cells that can be programmed to a desired level of current gain in linear decibels or linear step intervals. Smaller step sizes can be obtained by programming a current source within the step intervals.

REFERENCES:
patent: 6518906 (2003-02-01), Abel et al.
patent: 6621432 (2003-09-01), Ganci
patent: 2006/0092062 (2006-05-01), Pan

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