Patent US4417234A successfully refreshed from Google Patents.
US4417234A
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US
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Multiplexed analog to digital converter having a feedback stabilized ramp
Assignee: Kearfott Guidance and Navigation Corp
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Filing: 1981-12-03
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Granted: 1983-11-22
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Expires: 2001-12-03
Abstract
Abstract A multiplexed analog-to-digital converter is provided for use in an inertial navigation system comprising a multiplexer, a buffer, a feedback stabilized ramp generator and a comparator controlling a gated counter whose digital output is representative of the analog input signal.
Inventors
- 👤 Joseph V. McKenna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:06
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/1205; H03M1/50; H03M1/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
An analog-to-digital converter for an inertial navigation system comprising: an inertial navigation platform having a gyroscope and an accelerometer supplying a plurality of analog signals, a multiplexer connected to the gyroscope and the accelerometer for receiving one analog input signal from the plurality of analog signals, a timing unit coupled to the multiplexer for selecting the one analog input signal, a comparator having an input connected to the multiplexer, a feedback stabilized ramp generator having an output connected to the comparator input and having a feedback input, a gated counter connected to and controlled by the comparator for supplying a digital output which is representative of the platform analog signal, a feedback line connected between the gated counter and the feedback input of the stabilized ramp generator, a dither generator connected to the comparator input, a buffer having an input connected to the multiplexer and an output connected to the comparator, and a reference generator connected to the stabilized ramp generator and connected to the dither generator.
Claim 2
Dependent Claim
167 words
An analog-to-digital converter for an inertial navigation system comprising: an inertial navigation platform having a gyroscope and an accelerometer supplying a plurality of analog signals, a multiplexer connected to the gyroscope and the accelerometer for receiving one analog input signal from the plurality of analog signals, a timing unit coupled to the multiplexer for selecting the one analog input signal, a comparator having an input connected to the multiplexer, a feedback stabilized ramp generator having an output connected to the comparator input and having a feedback input, a gated counter connected to and controlled by the comparator for supplying a digital output which is representative of the platform analog signal, a feedback line connected between the gated counter and the feedback input of the stabilized ramp generator, a dither generator connected to the comparator input, a buffer having an input connected to the multiplexer and an output connected to the comparator, and a reference generator connected to the stabilized ramp generator and connected to the dither generator.
Claim 3
Dependent Claim
60 words
The converter of claim 1, wherein the stabilized ramp converter includes: a D-type control flip flop connected to the feedback line from the gated counter, an open collector inverter connected to the D-type control flip flop, an integrator amplifier connected to the open collector inverter, and a summing amplifier connected to the integrator amplifier and connected to the comparator input.
Claim 4
Dependent Claim
55 words
The converter of claim 2, wherein the gated counter includes: a flip flop coupled to the timing unit and connected to the comparator, a gate coupled to the timing unit and connected to the flip flop for supplying the counter and a shift register coupled to the timing unit for receiving data from the counter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |