US5760723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delta-sigma analog-to-digital converter including charge coupled devices
Assignee: General Electric Co
•
Filing: 1996-06-10
•
Granted: 1998-06-02
•
Expires: 2016-06-10
Abstract
Abstract A delta sigma modulator having reduced quiescent power consumption as compared to known delta sigma modulators utilizes no operational amplifiers and includes, in one embodiment, an input CCD and a summing CCD coupled to the output of the input CCD. A readout is connected to receive output signals from the summing CCD. Both an integration/recirculation input CCD and a comparator are provided to receive output signals from the readout. The integration/recirculation input CCD feeds back a charge to the summing CCD, and the output of the comparator is connected to a fill and spill reference CCD, which also feeds back a charge to the summing CCD. The comparator output signal is an oversampled digitized version of the analog signal sampled by the input CCD. The comparator output signal is supplied to a low pass digital filter, and a decimator is connected to the output of the digital filter.
Inventors
- 👤 Donald Thomas McGrath
- 👤 Paul Andrew Frank
- 👤 Jerome Johnson Tiemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:07
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/30; H03M3/32; H03M3/39; H03M3/412; H03M3/422; H03M3/43; H03M3/436; H03M3/456
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
117 words
A delta sigma modulator comprising: an input charge coupled device for sampling an input analog signal and generating a first charge proportional to the magnitude of the input analog signal; a summing charge coupled device for receiving charge and for generating a summed charge; readout means for generating a readout signal responsive to said summed charge; an output comparator for comparing said readout signal with a predetermined reference level and for generating a predetermined output signal in accordance with the level of said readout signal relative to said reference level; and a fill and spill reference charge coupled device responsive to said output signal for adding or subtracting a reference charge to said input charge coupled device.
Claim 2
Dependent Claim
117 words
A delta sigma modulator comprising: an input charge coupled device for sampling an input analog signal and generating a first charge proportional to the magnitude of the input analog signal; a summing charge coupled device for receiving charge and for generating a summed charge; readout means for generating a readout signal responsive to said summed charge; an output comparator for comparing said readout signal with a predetermined reference level and for generating a predetermined output signal in accordance with the level of said readout signal relative to said reference level; and a fill and spill reference charge coupled device responsive to said output signal for adding or subtracting a reference charge to said input charge coupled device.
Claim 3
Dependent Claim
42 words
The delta sigma modulator of claim 1 including an integration and recirculation charge coupled device adapted to inject a reference charge into said summing charge coupled device whenever the readout signal from said readout means is less than said predetermined reference level.
Claim 4
Dependent Claim
44 words
The delta sigma modulator of claim 1 wherein said fill and spill reference charge coupled device is adapted to subtract said reference charge from said summing charge coupled device whenever the readout signal from said readout means is greater than said predetermined reference level.
Claim 5
Dependent Claim
39 words
The delta sigma modulator of claim 1 including an integration and recirculation charge coupled device adapted to inject a fixed amount of charge into said summing charge coupled device whenever the readout signal from said readout means is negative.
Claim 6
Dependent Claim
29 words
The delta sigma modulator of claim 4 wherein said output comparator is adapted to produce a digital "one" whenever said readout signal is greater than said predetermined reference level.
Claim 7
Dependent Claim
29 words
The delta sigma modulator of claim 4 wherein said output comparator is adapted to produce a digital "zero" whenever said readout signal is less than said predetermined reference level.
Claim 8
Dependent Claim
36 words
The delta sigma modulator of claim 6 wherein said fill and spill reference charge coupled device is adapted to add a charge to said summing charge coupled device whenever said output comparator produces a digital zero.
Claim 9
Dependent Claim
38 words
The delta sigma modulator of claim 7 wherein said fill and spill reference charge coupled device is adapted to subtract a charge from said summing charge coupled device whenever a digital one is produced by said output comparator.
Claim 10
Dependent Claim
94 words
A delta-sigma modulator comprising: an imput charge coupled device for sampling an input analog signal and generating a first charge proportional to the magnitude of the input analog signal; an integrator responsive to said input charge coupled device for generating an integrated charge representative of the input analog signal, said integrator comprising a summing charge coupled device for receiving the first charge and for generating a summed charge; readout means for generating a readout signal responsive to said summed charge; and an analog-to-digital converter for generating a digital signal representative of the integrated charge.
Claim 11
Dependent Claim
94 words
A delta-sigma modulator comprising: an imput charge coupled device for sampling an input analog signal and generating a first charge proportional to the magnitude of the input analog signal; an integrator responsive to said input charge coupled device for generating an integrated charge representative of the input analog signal, said integrator comprising a summing charge coupled device for receiving the first charge and for generating a summed charge; readout means for generating a readout signal responsive to said summed charge; and an analog-to-digital converter for generating a digital signal representative of the integrated charge.
Claim 12
Dependent Claim
36 words
The delta signal modulator of claim 9 wherein said analog-to-digital converter comprises an output comparator for comparing the readout signal with a predetermined reference level and generating an output signal as a result of the comparison.
Claim 13
Dependent Claim
47 words
The delta sigma modulator of claim 10 wherein said integrator comprises an integration and recirculation charge coupled device adapted to inject a fixed amount of charge into said summing charge coupled device whenever said readout signal from said readout means is less than said predetermined reference level.
Claim 14
Dependent Claim
37 words
The delta sigma modulator of claim 11 wherein said integration and recirculation reference charge coupled device is adapted to inject a fixed amount of charge into said summing charge coupled device whenever said readout signal is negative.
Claim 15
Dependent Claim
29 words
The delta sigma modulator of claim 12 wherein said output comparator is adapted to produce a digital "one" whenever said readout signal is greater than said predetermined reference level.
Claim 16
Dependent Claim
29 words
The delta sigma modulator of claim 12 wherein said output comparator is adapted to produce a digital "zero" whenever said readout signal is less than said predetermined reference level.
References Cited (Backward Citations)
US5010340A
Cited
US5065157A
Cited
US5148166A
Cited
US5103229A
Cited
US5142286A
Cited
US5181032A
Cited
US5187482A
Cited
US5248971A
Cited
US5283578A
Cited
US5585797A
Cited
US5537115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-01 | 2001-12-01 | 2002-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-01 | 2005-12-01 | 2006-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-01 | 2009-12-01 | 2010-06-02 | $7700.00 | Window Closed / Lapsed |