US4968987A
Expired / Lapsed
US
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Delta-sigma modulation analog to digital converter
Assignee: Toshiba Corp
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Filing: 1989-05-05
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Granted: 1990-11-06
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Expires: 2009-05-05
Abstract
Abstract A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal. The converter includes a clock generator for generating a very high frequency clock signal, a dither signal generator responsive to the clock signal generator for generating a dither signal which is synchronized with the clock signal, an adder coupled to the dither signal generator for combining the analog input signal and the dither signal, a delta-sigma modulation type quantizer coupled to the adder for quantizing the analog input signal and the dither signal in response to the clock signal and a data decimation circuit responsive to the clock signal and coupled to the delta-sigma modulation type quantizer for decimation prescribed quantization data from the quantized signal and producing a digital signal corresponding to the analog input signal.
Inventors
- 👤 Hideyuki Naka
- 👤 Kazuo Konishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:39
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M3/00; H03M3/30; H03M3/322; H03M3/324; H03M3/326; H03M3/328; H03M3/458
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal comprising: clock generator means for generating a clock signal; dither signal generator means, responsive to the clock signal generator means, for generating a dither signal synchronized with the clock signal; adder means, coupled to the dither signal generator means, for combining the analog input signal and the dither signal, and outputting a combined signal; delta-sigma modulation type quantization means, coupled to the adder means, for quantizing the combined signal in response to the clock signal, and outputting a quantized combined signal; and decimation circuit means, responsive to the clock signal and coupled to the delta-sigma modulation type quantization means, for substantially eliminating the dither signal from the quantized combined signal and producing a digital signal corresponding to the analog input signal.
Claim 2
Dependent Claim
139 words
A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal comprising: clock generator means for generating a clock signal; dither signal generator means, responsive to the clock signal generator means, for generating a dither signal synchronized with the clock signal; adder means, coupled to the dither signal generator means, for combining the analog input signal and the dither signal, and outputting a combined signal; delta-sigma modulation type quantization means, coupled to the adder means, for quantizing the combined signal in response to the clock signal, and outputting a quantized combined signal; and decimation circuit means, responsive to the clock signal and coupled to the delta-sigma modulation type quantization means, for substantially eliminating the dither signal from the quantized combined signal and producing a digital signal corresponding to the analog input signal.
Claim 3
Dependent Claim
31 words
The converter of claim 1 wherein the dither signal generator means includes means for generating a frequency of the dither signal which is related to the frequency of the clock signal.
Claim 4
Dependent Claim
14 words
The converter of claim 2 wherein the frequency generating means includes a multiplier circuit.
Claim 5
Dependent Claim
16 words
The converter of claim 2 wherein the dither signal generator means includes a sinusoidal wave generator.
Claim 6
Dependent Claim
16 words
The converter of claim 2 wherein the dither signal generator means includes a rectangular wave generator.
Claim 7
Dependent Claim
16 words
The converter of claim 2 wherein the dither signal generator means includes a triangular wave generator.
Claim 8
Dependent Claim
28 words
The converter of claim 1 wherein the dither signal generator means includes means for synchronizing the phase of the dither signal with the phase of the clock signal.
Claim 9
Dependent Claim
122 words
A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal comprising: clock generator means for generating a clock signal; dither signal generator means, responsive to the clock signal generator means, for generating a dither signal synchronized with the clock signal; delta-sigma modulation type quantization means for quantizing the analog input signal and the dither signal in response to the clock signal; and decimation circuit means, responsive to the clock signal and coupled to the delta-sigma modulation type quantization means, for eliminating the quantized dither signal from the quantized analog signal and the quantized dither signal output from the delta-sigma modulation type quantization means and producing a digital signal corresponding to the analog input signal.
Claim 10
Dependent Claim
122 words
A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal comprising: clock generator means for generating a clock signal; dither signal generator means, responsive to the clock signal generator means, for generating a dither signal synchronized with the clock signal; delta-sigma modulation type quantization means for quantizing the analog input signal and the dither signal in response to the clock signal; and decimation circuit means, responsive to the clock signal and coupled to the delta-sigma modulation type quantization means, for eliminating the quantized dither signal from the quantized analog signal and the quantized dither signal output from the delta-sigma modulation type quantization means and producing a digital signal corresponding to the analog input signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |