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GB976960A - Electrical comparator - Google Patents

Electrical comparator

Info

Publication number
GB976960A
GB976960A GB28627/63A GB2862763A GB976960A GB 976960 A GB976960 A GB 976960A GB 28627/63 A GB28627/63 A GB 28627/63A GB 2862763 A GB2862763 A GB 2862763A GB 976960 A GB976960 A GB 976960A
Authority
GB
United Kingdom
Prior art keywords
comparator
store
transistor
balance
signal
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
Application number
GB28627/63A
Inventor
John Clifford Price
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB28627/63A priority Critical patent/GB976960A/en
Priority to GB28626/63A priority patent/GB976959A/en
Priority to US381413A priority patent/US3366948A/en
Priority to NL6407840A priority patent/NL6407840A/xx
Priority to NL6407841A priority patent/NL6407841A/xx
Priority to ES0301976A priority patent/ES301976A1/en
Priority to BE650599D priority patent/BE650599A/xx
Priority to BE650600D priority patent/BE650600A/xx
Priority to FR982070A priority patent/FR1401825A/en
Priority to CH943064A priority patent/CH449703A/en
Publication of GB976960A publication Critical patent/GB976960A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/044—Sample and hold circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
    • H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
    • H03K5/2409—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using bipolar transistors
    • H03K5/2418—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using bipolar transistors with at least one differential stage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/042—Special circuits, e.g. comparators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values
    • H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
    • H03M1/40—Analogue value compared with reference values sequentially only, e.g. successive approximation type recirculation type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values
    • H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
    • H03M1/46—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

976,960. Analogue-to-digital converters. STANDARD TELEPHONES & CABLES Ltd. July 19,1963, No. 28627/63. Heading G4H. [Also in Division H4] In an analogue-to-digital converter adapted to convert a succession of values the comparator delivers a signal indicating the sense of the difference between the input value and the balance signal and there are means made effective between conversion operations for using the comparator output for eliminating any difference between the potentials on the two input terminals to the comparator. This effects a zero adjustment. The signals to be digitised are applied by gate G3, Fig. 1 to a capacitor store CS where they are held during conversion. The output of the store is amplified to form one input to the comparator D. The balance signal is derived from a resistance network RN controlled by logical circuits receiving the output of the comparator to effect the necessary switching. After a conversion the store is cleared by gate G1 and the gate G2 is opened to cause the compensating circuit CC to operate counteracting base line drift of the amplifier and any shift in the working of the comparator. As shown in Fig. 3 the comparator consists of a longtailed pair of transistors T1A, T1B receiving the input analogue signal and the balance voltage respectively. If the store voltage is higher transistor T1A conducts. Cascaded transistors T2A, T3A and T4A also conduct, the last giving an output at OP. If the balance voltage is higher transistor T1B conducts and T2B, T3B, T4B. This gives a space mark. After clearing the store a pulse J2 (Fig. 1) is applied to transistor gate G2. Both inputs to the comparator should be zero but if the balance terminal signal is greater than the analogue terminal signal transistor T4B conducts charging capacitor C during time J2. The current increases in transistor T6 until the difference is eliminated. The charge on the capacitor decays slowly, the next conversion being made while this zero adjustment is effectively correct. Specification 976,959 is referred to.
GB28627/63A 1963-07-19 1963-07-19 Electrical comparator Expired GB976960A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
GB28627/63A GB976960A (en) 1963-07-19 1963-07-19 Electrical comparator
GB28626/63A GB976959A (en) 1963-07-19 1963-07-19 Electrical switching arrangement
US381413A US3366948A (en) 1963-07-19 1964-07-09 Reference level zero adjuster for analog to digital converter
NL6407840A NL6407840A (en) 1963-07-19 1964-07-10
NL6407841A NL6407841A (en) 1963-07-19 1964-07-10
ES0301976A ES301976A1 (en) 1963-07-19 1964-07-11 An electrical switching device. (Machine-translation by Google Translate, not legally binding)
BE650599D BE650599A (en) 1963-07-19 1964-07-16
BE650600D BE650600A (en) 1963-07-19 1964-07-16
FR982070A FR1401825A (en) 1963-07-19 1964-07-17 Switching arrangement and electric comparator
CH943064A CH449703A (en) 1963-07-19 1964-07-17 Analog-to-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28627/63A GB976960A (en) 1963-07-19 1963-07-19 Electrical comparator

Publications (1)

Publication Number Publication Date
GB976960A true GB976960A (en) 1964-12-02

Family

ID=10278598

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28627/63A Expired GB976960A (en) 1963-07-19 1963-07-19 Electrical comparator

Country Status (1)

Country Link
GB (1) GB976960A (en)

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