GB921725A - Improvements in or relating to comparison circuits for binary numbers - Google Patents

Improvements in or relating to comparison circuits for binary numbers

Info

Publication number
GB921725A
GB921725A GB3405560A GB3405560A GB921725A GB 921725 A GB921725 A GB 921725A GB 3405560 A GB3405560 A GB 3405560A GB 3405560 A GB3405560 A GB 3405560A GB 921725 A GB921725 A GB 921725A
Authority
GB
United Kingdom
Prior art keywords
digit
unknown
transistor
comparison
conducts
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
GB3405560A
Inventor
Ivor Noel Hooton
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB3405560A priority Critical patent/GB921725A/en
Priority to FR874910A priority patent/FR1302279A/en
Publication of GB921725A publication Critical patent/GB921725A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/02—Comparing digital values
    • G06F7/026—Magnitude comparison, i.e. determining the relative order of operands based on their numerical value, e.g. window comparator

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Electronic Switches (AREA)
  • Logic Circuits (AREA)

Abstract

921,725. Transistor comparator circuits. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. Sept. 29, 1961 [Oct. 4, 1960], No. 34055/60. Class 40 (6). [Also in Group XIX] In a circuit for comparing a known binary number with an unknown binary number (see Group XIX), the comparison circuit stage for each pair of corresponding digits, Fig. 5, comprises a PNP transistor T1 and an NPN transistor T2. The emitters of T1, T2 are held at E 1 (0 volts) or E 0 (-10 volts) according as the unkown digit is " 1 " or " 0," and the collectors are connected to a tapping on a potentiometer chain (not shown) for effecting the comparison of the two numbers. When the known digit is a " 0 ", no current is fed in at P1 and a catching diode D6 holds the bases of T1, T2 at E 1 -E J and E 1 -E J -E Z , respectively, where E z is the drop across an avalanche diode D7. When the known digit is a " 1," current is fed to a resistor R4 and a catching diode D5 holds the bases of T1, T2 at E 1 +E J and E 1 + E J -E z , respectively. The voltage E J is chosen so that T1 conducts only for an unknown " 1 " and a known " 0 " while T2 conducts only for an unknown " 0 " and a known " 1." Fig. 7 shows an alternative comparison stage in which the known digit is set up by adjusting a two-position switch S<SP>1</SP> and the unknown digit is represented by the conducting state of a transistor T<SP>1</SP>. A PNP transistor T4 in parallel constitute a unidirectional conducting device whose direction of conduction is set by the switch S1.
GB3405560A 1960-10-04 1960-10-04 Improvements in or relating to comparison circuits for binary numbers Expired GB921725A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3405560A GB921725A (en) 1960-10-04 1960-10-04 Improvements in or relating to comparison circuits for binary numbers
FR874910A FR1302279A (en) 1960-10-04 1961-10-03 Comparison circuit for binary numbers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3405560A GB921725A (en) 1960-10-04 1960-10-04 Improvements in or relating to comparison circuits for binary numbers

Publications (1)

Publication Number Publication Date
GB921725A true GB921725A (en) 1963-03-20

Family

ID=10360805

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3405560A Expired GB921725A (en) 1960-10-04 1960-10-04 Improvements in or relating to comparison circuits for binary numbers

Country Status (1)

Country Link
GB (1) GB921725A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194365A (en) * 1986-08-22 1988-03-02 Sony Corp Digital word comparison

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194365A (en) * 1986-08-22 1988-03-02 Sony Corp Digital word comparison
GB2194365B (en) * 1986-08-22 1990-10-31 Sony Corp Digital word comparison

Similar Documents

Publication Publication Date Title
GB879651A (en) Improvements in or relating to transistor circuits
GB764100A (en) Switching circuits employing junction transistors
GB929525A (en) A binary circuit or scaler
GB921725A (en) Improvements in or relating to comparison circuits for binary numbers
GB914848A (en) Improvements in tunnel diode frequency changes
US2995666A (en) Exclusive or logical circuit
GB982453A (en) Improvements in transistor circuits
US3184609A (en) Transistor gated switching circuit having high input impedance and low attenuation
GB786056A (en) Improvements in or relating to electrical circuits employing static electrical switches
GB765381A (en) Transistor bistable latch circuits
US3092735A (en) Switching circuit for a ladder type digital to analog converter utilizing an alternating reference voltage
ES361970A1 (en) Marginal switching arrangement
GB900028A (en) Improvements in or relating to signal separator devices
US3041471A (en) Level limiting emitter biasing circuit for preventing complete cut-off of transistor
SU450372A1 (en) Ring counter
GB1002776A (en) Voltage integrator circuit
GB1306241A (en)
GB861727A (en) Improvements in or relating to sequential switching apparatus
JPS57148427A (en) Semiconductor integrated circuit
SU834838A1 (en) Current element
SU410384A1 (en)
GB1031769A (en) Improvements in electronic switching circuits
SU491191A1 (en) Pulse amplifier
GB917544A (en) Improvements in or relating to electronic counters and the like
SU520707A1 (en) Analog Multichannel Switch