EP0325926A2
Expired / Lapsed
EP
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Oversampling A/D converter and method for performing A/D conversion
Assignee: Motorola Solutions Inc
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Filing: 1989-01-09
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Granted: —
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Expires: 2009-01-09
Abstract
Abstract An oversampling converter (76) for converting an analog input signal to a high resolution digital equivalent is provided. The oversampling converter (76) uses sigma delta modulation utilizing single integration. A plurality of quantization circuits (79, 80, 81) provide a plurality of output signals (Y1, Y2, Y3), each output signal containing data information and an error component. Each quantization circuit performs an integration of a difference of an input signal and a feedback signal before quantizing the integrated signal as one of the output signals. A filter (77), such as a decimation filter, is coupled to the converter (76) for receiving the multiple outputs of the converter (76) and providing a filtered converted digital output signal.
Inventors
- 👤 Nicholas Van Bavel
- 👤 Tim A. Williams
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 13:16
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/30; H03M3/39; H03M3/412; H03M3/414; H03M3/418
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
247 words
In an oversampling A/D converter (76) for receiving an analog input signal and operating at a predetermined sampling frequency, said A/D converter having a plurality of quantization loops (79,80,81), each quantization loop (79) comprising: an integrator (83), for integrating a difference between an input terminal signal and a feedback signal; a quantizer (84) for quantizing an output from the integrator and providing a quantized signal having a predetermined amount of data and noise; and means (86) for converting the quantized signal from the quantizer to the feedback signal; the highest ranked quantization loop (79) receiving the input signal as the input signal, and the remaining quantization loops (80,81) receiving the input terminal signal from an immediately higher ranked loop, all the loops except the lowest ranked loop further comprising coupling means (88,89,96,97) for providing the input terminal signal to the immediately lower ranked loop, wherein said A/D converter is further characterized by: providing the A/D converter with a plurality of output signals (Y1,Y2,Y3), each output signal being the quantized signal of a predetermined guantization loop; and filter means (77) having a plurality of input terminals (A,B,C), each of the input terminals being coupled to a predetermined one of the output signals (Y1,Y2,Y3) of the A/D converter, and having an output terminal for providing a digital equivalent of the analog input signal, said filter means using the data of each of the received output signals of the A/D converter and minimizing the noise in each received output signal.
Claim 2
Dependent Claim
247 words
In an oversampling A/D converter (76) for receiving an analog input signal and operating at a predetermined sampling frequency, said A/D converter having a plurality of quantization loops (79,80,81), each quantization loop (79) comprising: an integrator (83), for integrating a difference between an input terminal signal and a feedback signal; a quantizer (84) for quantizing an output from the integrator and providing a quantized signal having a predetermined amount of data and noise; and means (86) for converting the quantized signal from the quantizer to the feedback signal; the highest ranked quantization loop (79) receiving the input signal as the input signal, and the remaining quantization loops (80,81) receiving the input terminal signal from an immediately higher ranked loop, all the loops except the lowest ranked loop further comprising coupling means (88,89,96,97) for providing the input terminal signal to the immediately lower ranked loop, wherein said A/D converter is further characterized by: providing the A/D converter with a plurality of output signals (Y1,Y2,Y3), each output signal being the quantized signal of a predetermined guantization loop; and filter means (77) having a plurality of input terminals (A,B,C), each of the input terminals being coupled to a predetermined one of the output signals (Y1,Y2,Y3) of the A/D converter, and having an output terminal for providing a digital equivalent of the analog input signal, said filter means using the data of each of the received output signals of the A/D converter and minimizing the noise in each received output signal.
Claim 3
Dependent Claim
23 words
The oversampling A/D converter of claim 1 wherein the plurality of quantization loops comprises two and the plurality of output terminals comprises two.
Claim 4
Dependent Claim
23 words
The oversampling A/D converter of claim 1 wherein the plurality of quantization loops comprises three and the plurality of output terminals comprises three.
Claim 5
Dependent Claim
100 words
The oversampling A/D converter of claim 1 wherein the filter means (77) further comprise: a plurality of columns (148,150,152,153) of digital integrators, each column having a plurality of digital integrators, each of the output signals being coupled to a predetermined one of the columns of digital integrators; and a plurality of columns (160-163) of digital differentiators coupled to the columns of digital integrators, each column of differentiators having a plurality of digital differentiators, the plurality being at least equal in number to the plurality of columns of digital integrators, said differentiators providing the digital equivalent of the analog input signal.
Claim 6
Dependent Claim
94 words
The oversampling A/D converter of any one of claims 1 to 4, wherein the filter (77) means comprises a plurality of integrator means (110, 111, 112) arranged in sequence, the output of each integrator means being connected to the input of the next integrator means, and wherein the first integrator means (110) in the sequence receives the output signal from the highest ranked quantization loop (79) and each subsequent integrator means (111,112) receives the output from the next highest quantization loop (80,81), that output being added to the output from the preceding integrator means.
Claim 7
Independent Claim
253 words
A method of performing data conversion in an oversampling A/D converter which receives and converts and analog input signal and operates at a predetermined sampling frequency, said A/D converter having a plurality of quantization loops (79,80,81), each quantization loop (79) comprising: an integrator (83), for integrating a difference between and input terminal signal and a feedback signal; a quantizer (84) for quantizing an output from the integrator and providing a quantized signal having a predetermined amount of data and noise; and means (86) for converting the quantized signal from the quantizer to the feedback signal; the highest ranked quantization loop (79) receiving the input signal as the input signal, and the remaining quantization loops receiving the input terminal signal from an immediately higher ranked loop, all the loops except the lowest ranked loop further comprising coupling means (88,89,96,97) for providing the input terminal signal to the immediately lower ranked loop, said method characterized by the steps of: providing the A/D converter with a plurality of output signals (Y1,Y2,Y3), each output signal being the quantized signal of a predetermined quantization loop; and coupling filter means (77) having a plurality of input terminals (A,B,C) to the A/D converter, each input terminal being coupled to a predetermined one of the output signals (Y1,Y2,Y3), said filter means having an output terminal for providing a digital equivalent of the analog input signal, said filter means using the data of each of the received output signals of the A/D converter and minimizing the noise in each received output signal.
Claim 8
Independent Claim
253 words
A method of performing data conversion in an oversampling A/D converter which receives and converts and analog input signal and operates at a predetermined sampling frequency, said A/D converter having a plurality of quantization loops (79,80,81), each quantization loop (79) comprising: an integrator (83), for integrating a difference between and input terminal signal and a feedback signal; a quantizer (84) for quantizing an output from the integrator and providing a quantized signal having a predetermined amount of data and noise; and means (86) for converting the quantized signal from the quantizer to the feedback signal; the highest ranked quantization loop (79) receiving the input signal as the input signal, and the remaining quantization loops receiving the input terminal signal from an immediately higher ranked loop, all the loops except the lowest ranked loop further comprising coupling means (88,89,96,97) for providing the input terminal signal to the immediately lower ranked loop, said method characterized by the steps of: providing the A/D converter with a plurality of output signals (Y1,Y2,Y3), each output signal being the quantized signal of a predetermined quantization loop; and coupling filter means (77) having a plurality of input terminals (A,B,C) to the A/D converter, each input terminal being coupled to a predetermined one of the output signals (Y1,Y2,Y3), said filter means having an output terminal for providing a digital equivalent of the analog input signal, said filter means using the data of each of the received output signals of the A/D converter and minimizing the noise in each received output signal.
Claim 9
Dependent Claim
25 words
The method of claim 6 wherein said filter means digitally integrates and differentiates the multiple outputs of the A/D converter to a predetermined bit resolution.
References Cited (Backward Citations)
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