GB967671A - Improvements relating to analogue to digital converters - Google Patents
Improvements relating to analogue to digital convertersInfo
- Publication number
- GB967671A GB967671A GB17817/61A GB1781761A GB967671A GB 967671 A GB967671 A GB 967671A GB 17817/61 A GB17817/61 A GB 17817/61A GB 1781761 A GB1781761 A GB 1781761A GB 967671 A GB967671 A GB 967671A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- input
- sweep
- pulse
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/665—Digital/analogue converters with intermediate conversion to phase of sinusoidal or similar periodical signals
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
967, 671. Electric selective signalling. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Aug. 15,1962 [May 16, 1961],No. 17817/61. Heading G4H. [Also in Division H3] In an analogue-to-digital converter, in which pulses are fed to a counter for a time period proportional to the analogue sample quantity, a recurrent sweep voltage and the sample voltage are both applied to an amplifier the input A to which has upper and lower limit clamping devices, D3, D4, and a feedback such that the input voltage tends to assume one of the limiting values, and to change from one to the other when the sweep voltage reaches the sample value thereby producing an amplified output pulse which terminates or starts the time period. In Fig. 4, sample and sweep voltages are D.C. restored to be position and negative respectively, and applied through cathode follower valves Vl, V2 and resistors R5, R6 (a) to the input of a pentode amplifier V3 the output of which is fed through a cathode follower valve V4 &c. to a differentiating circuit C2,R15 5 preceding a blocking oscillator and also (b)to a resistor chain R7,R8,R10 associated with input clamping diodes D3,D4. At the beginning of the sweep, diode D3 conducts and clamps input A. As the sweep voltage approaches the sample voltage in magnitude, the voltage of input A tends to fall until diode D3 ceases to conduct, when a fall takes place which is amplified and fed back to make diode D4 conduct thereby clamping input A against further fall in voltage. The amplifier output rise consequent to cut-off of diode D3 is differentiated and triggers the blocking oscillator to produce a pulse which is delayed and then resets a gating pulse generator. This terminates a gating pulse which was allowing counting pulses to enter a binary counter and which was initiated at or soon after the start of the sweep by a delayed timing pulse. The blocking oscillator pulse also closes an inhibit gate through which the delayed timing pulse passes, so if the sample voltage is too small, the inhibit gate will be closed when the delayed timing pulse arrives and no counting will take place. To prevent overrun of the counter an AND gate receives counter outputs and resets the gating pulse generator if necessary.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB17817/61A GB967671A (en) | 1961-05-16 | 1961-05-16 | Improvements relating to analogue to digital converters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB17817/61A GB967671A (en) | 1961-05-16 | 1961-05-16 | Improvements relating to analogue to digital converters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB967671A true GB967671A (en) | 1964-08-26 |
Family
ID=10101746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17817/61A Expired GB967671A (en) | 1961-05-16 | 1961-05-16 | Improvements relating to analogue to digital converters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB967671A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1269167B (en) * | 1965-01-08 | 1968-05-30 | Rochar Electronique | Apparatus and method for converting an analog signal into numerical information using a memory device |
DE1295629B (en) * | 1964-07-15 | 1969-05-22 |
-
1961
- 1961-05-16 GB GB17817/61A patent/GB967671A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1295629B (en) * | 1964-07-15 | 1969-05-22 | ||
DE1269167B (en) * | 1965-01-08 | 1968-05-30 | Rochar Electronique | Apparatus and method for converting an analog signal into numerical information using a memory device |
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