Trim method for high voltage drivers
First Claim
1. An integrated circuit driver for driving at least one accurate high-voltage outputs comprising:
- at least one high voltage driver channel output terminals;
an external precision high impedance resistor divider coupled externally to said at least one high voltage divider channel output terminals;
an internal resistor divider coupled to said at least one high voltage divider output terminals; and
a resistor calibration circuit;
wherein said one or more internal resistor dividers are calibrated in conformance with said external precision high impedance resistor divider until a voltage on a set of divider taps match.
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Abstract
Methods and circuits are provided to create small, power minimizing, multi-channel high voltage drivers for micro-electromechanical systems (MEMS). A resistor calibration circuit is introduced to allow on chip resistor dividers to be calibrated against a single precision high voltage resistor divider, eliminating the cost and printed circuit board real estate associated with multiple resistor dividers connected to each channel. Additionally, a multiple-power rail configuration is provided to reduce power to the overall system by producing several rails generated by a boost converter or a capacitive charge pump, where the voltage output of the rails is produced to group rails of lesser voltage requirement rather than connecting all channels to the same high voltage rail on a dynamic basis.
6 Citations
16 Claims
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1. An integrated circuit driver for driving at least one accurate high-voltage outputs comprising:
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at least one high voltage driver channel output terminals; an external precision high impedance resistor divider coupled externally to said at least one high voltage divider channel output terminals; an internal resistor divider coupled to said at least one high voltage divider output terminals; and a resistor calibration circuit; wherein said one or more internal resistor dividers are calibrated in conformance with said external precision high impedance resistor divider until a voltage on a set of divider taps match. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A precision multi-channel monolithic voltage regulation circuit comprising:
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a closed loop amplifier; a level shift; an internal divider feedback network calibrated against an external precision resistor divider; and wherein said closed loop amplifier couples a voltage to an output terminal utilizing said level shift or said transconductor in conformance with the calibrated internal divider feedback network.
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Specification