US4733217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subranging analog to digital converter
Assignee: RCA Licensing Corp
•
Filing: 1986-05-08
•
Granted: 1988-03-22
•
Expires: 2006-05-08
Abstract
Abstract A subranging analog-to-digital converter is disclosed. A coarse analog-to-digital converter has an analog input terminal coupled to a source of analog signal, a digital output terminal, and a range indication output terminal. First and second fine analog-to-digital converters each have an analog input terminal coupled to the analog signal source, a range selection input terminal coupled to the range indication output terminal, and a digital output terminal. A combining circuit has input terminals coupled to the digital output terminals of the coarse and first and second fine analog-to-digital converters. The coarse analog-to-digital converter operates on every clock cycle, and the fine analog-to-digital converters operate alternately on every other clock cycle to produce a sequence of digital samples representing the analog signal, one for each clock cycle.
Inventors
- 👤 Andrew G. F. Dingwall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:56
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/1205; H03M1/121; H03M1/1215; H03M1/14; H03M1/145
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A subranging analog-to-digital converter, comprising: an analog input terminal; a coarse analog-to-digital converter having an analog input port coupled to said input terminal, a digital output terminal and a range indication output terminal; first and second fine analog-to-digital converters each having an analog input port coupled to said input terminal, a range selection input terminal coupled to said range indication output terminal, and a digital output terminal; and means having respective input terminals coupled to the digital output terminals of said coarse and said first and second fine analog-to-digital converters for alternately combining signals from said first and second fine analog-to-digital converters with signals from said coarse analog-to-digital converter to produce a sequence of digital samples representing said analog signal.
Claim 2
Dependent Claim
120 words
A subranging analog-to-digital converter, comprising: an analog input terminal; a coarse analog-to-digital converter having an analog input port coupled to said input terminal, a digital output terminal and a range indication output terminal; first and second fine analog-to-digital converters each having an analog input port coupled to said input terminal, a range selection input terminal coupled to said range indication output terminal, and a digital output terminal; and means having respective input terminals coupled to the digital output terminals of said coarse and said first and second fine analog-to-digital converters for alternately combining signals from said first and second fine analog-to-digital converters with signals from said coarse analog-to-digital converter to produce a sequence of digital samples representing said analog signal.
Claim 3
Dependent Claim
29 words
The converter of claim 1 wherein said coarse and said first and second fine analog-to-digital converters each comprise a sample and hold circuit responsive to said analog input signal.
Claim 4
Dependent Claim
61 words
The converter of claim 2 wherein said sample and hold circuits of said coarse and said first fine analog-to-digital converters are conditioned to sample simultaneously at successive points in time, and said sample and hold circuits of said coarse and said second fine analog-to-digital converters are conditioned to sample simultaneously at points of time intermediate to said successive points in time.
Claim 5
Dependent Claim
93 words
The converter of claim 1, wherein: said subranging analog-to-digital converter produces said sequence of digital samples each having n bits, where n is an integer greater than 2; said coarse analog-to-digital converter includes a coarse resistor element having 2 x coarse segments having substantially equal ohmic increments, where x is an integer less than n; and said first and second fine analog-to-digital converters each respectively include a fine resistor string having 2 x fine segments connected in parallel with a corresponding coarse segment, and each fine segment being subdivided into 2.sup.(n-x) fine subsegments.
References Cited (Backward Citations)
US3597761A
Cited
US3820112A
Cited
US4345241A
Cited
US4398179A
Cited
US4456904A
Cited
US4542370A
Cited
US4571574A
Cited
US4612531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |