Trim circuits and methodologies for data converters

Details Trim circuits and methodologies for data converters Trim circuits and methodologies for data converters

2006-04-25

2006-04-25

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S155000

Reexamination Certificate

active

07034735

ABSTRACT:
An improved digital-to-analog converter comprises a reference node, switches providing an input digital signal, and an output stage including at least one resistive element. A resistance ladder, coupled to the switches, includes branches corresponding respectively to bit positions, in which selective operation of the switches in response to the input digital signal produces a corresponding analog output signal from the output stage. The ladder includes a first trim structure coupled to the most significant bit position (MSB) and a second trim structure in the output stage resistive element or elements. The first trim structure is configured to adjust the gain of the converter without affecting the relative bit weights of the bit positions, and wherein the resistances of the first and second trim structures are substantially of a prescribed ratio prior to any trimming.

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LTC1599; LT/TP 1199 4K; “16-Bit Byte Wide, Low Glitch Multiplying DAC with 4-Quandrant Resistors”; Linear Techhnology Corporation; c. 1999; pp. 1-20; USA, no month.

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