Calibrated current source
AssigneeAnalog Devices, Inc.
InventorsWilliam G. J. Schofield, Douglas A. Mercer
Life of this patent
Estimating the term…
Abstract
A calibrated current source includes current source having an output node; a calibration circuit; a load circuit; a cascode switching circuit including a pair of cascode switches, one connected between the local circuit and output node, the other connected between the calibration circuit and the output node; and a bias circuit selectively applying a bias voltage to the cascode switches to selectively connect the load circuit and the calibration circuit to the output node while maintaining a constant voltage at the output node and across the current source to provide a consistent current to the load and calibration circuits.
Claims5
A calibrated current source comprising:
- a current source having an output node;
- a calibration circuit;
- a load circuit;
- a cascode switching circuit including a pair of cascode switches, one connected between said load circuit and output node, the other connected between said calibration circuit and said output node;
- and a bias circuit for selectively applying a bias voltage to said cascode switches to selectively connect said load circuit and said calibration current to said output node while maintaining a constant voltage at said output node and across said current source to provide a consistent current to said load and calibration circuits.
Dependencies are inferred from the claim text.