# US 10,873,340 B2 · Feed-forward high resolution sensor measurement using low resolution ADC

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- Number: US 10,873,340 B2
- Document ID: US10873340B2
- Status: Granted
- Kind: B2
- Application number: 16/667,409
- Filed: 2019-10-29
- Published: 2020-04-30
- Granted: 2020-12-22
- Earliest claimed: 2018-10-29
- Assignees: The Government of the United States of America, as represented by the Secretary of the Navy
- Applicants: The Government of the United States of America, as represented by the Secretary of the Navy
- Inventors: Ray Dixon
- Web page: https://patentgrep.com/patent/US10873340B2

## CPC

- H03M 1/12: Analogue/digital converters ({H03M1/001 – } H03M1/10 take precedence)
- H03M 1/48: Servo-type converters
- H03M 1/68: with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits
- H03M 1/00: Analogue/digital conversion; Digital/analogue conversion (conversion of analogue values to or from differential modulation H03M3/00)
- H03M 1/06: Continuously compensating for, or preventing, undesired influence of physical parameters (periodically, {e.g. by using stored correction values,} H03M1/10)
- H03M 1/1071: {Measuring or testing}
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)

## Abstract

According to one aspect of the invention, a method for making relatively high resolution measurements using relatively low resolution devices includes the steps of: deriving a first anticipated measurement value; using the first anticipated measurement value as an initial feed-forward signal; comparing the initial feed forward signal to a received signal from a sensor, thereby generating a compared signal; scaling the compared signal to full scale of an analog-to-digital converter, thereby generating a scaled signal; delivering the scaled signal in binary form for computation; and iteratively performing the comparing step until the compared signal is below a predetermined threshold value.

## Claims

### Claim 1

A method for making relatively high resolution measurements using relatively low resolution devices, the method including the steps of:
deriving a first anticipated measurement value;
using the first anticipated measurement value as an initial feed-forward signal;
comparing the initial feed forward signal to a received signal from a sensor, thereby generating a compared signal;
scaling the compared signal to full scale of an analog-to-digital converter, thereby generating a scaled signal;
delivering the scaled signal in binary form for computation; and
iteratively performing the comparing step until the compared signal is below a predetermined threshold value.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of deriving a first anticipated measurement value includes obtaining an absolute accuracy measurement and operational characteristics of the sensor.

### Claim 3 (depends on 1)

The method of claim 1, wherein the step of using the first anticipated measurement value includes two digital-to-analog converters (DACs) driving a “Coarse” and “Fine” signal into a summing amplifier.

### Claim 4 (depends on 3)

The method of claim 3, wherein the “Coarse” signal is preferably scaled to the full range of a sensor feedback output signal.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
shifting the scaled signal.

### Claim 6 (depends on 1)

The method of claim 1, wherein the feed-forward signal is derived in a processor.

### Claim 7 (depends on 1)

The method of claim 1, wherein the feed-forward signal is derived in a field-programmable gate array (FPGA).