ch3 - COMBINATIONAL ICs REPRESENTATION OF BINARY VARIABLES...

Info icon This preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
1 COMBINATIONAL ICs REPRESENTATION OF BINARY VARIABLES AT THE PHYSICAL LEVEL BASIC SWITCH. STRUCTURE OF GATES AND THEIR OPERATION REALIZATION OF GATES USING cmos CIRCUITS CHARACTERISTICS OF CIRCUITS: LOAD FACTORS AND FANOUT FACTORS, PROP- AGATION DELAYS, TRANSITION TIMES, AND EFFECT OF LOAD THREE-STATE GATES (DRIVERS) AND BUSES NOISE AND NOISE MARGINS EVOLUTION OF ICs. VLSI CIRCUIT-LEVEL DESIGN STYLES PACKAGING LEVELS: CHIPS, BOARDS AND CABINETS. Introduction to Digital Systems 3 – Combinational ICs
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 REPRESENTATION OF BINARY VARIABLES REPRESENTATION OF 0 AND 1 BY ELECTRICAL SIGNALS VOLTAGES CURRENTS ELECTRICAL CHARGES REALIZATION OF CIRCUITS THAT OPERATE ON THESE SIGNALS TO IMPLEMENT DESIRED SWITCHING FUNCTIONS TYPICAL VALUES FOR A 3.3V cmos TECHNOLOGY V Hmax 3.3V V Lmax 0.8V V Hmin 2.0V V Lmin 0.0V Introduction to Digital Systems 3 – Combinational ICs
Image of page 2
3 VOLTAGE REGIONS V Hmin V Hmax V Lmin V Lmax Forbidden region V H region V L region voltage Figure 3.1: VOLTAGE REGIONS. Introduction to Digital Systems 3 – Combinational ICs
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 POSITIVE AND NEGATIVE LOGIC x y z f POSITIVE LOGIC V H ←→ 1 V L ←→ 0 NEGATIVE LOGIC V H ←→ 0 V L ←→ 1 Input Output Positive Negative voltages voltage logic logic x y z x y z x y z V L V L V L 0 0 0 1 1 1 V L V H V L 0 1 0 1 0 1 V H V L V L 1 0 0 0 1 1 V H V H V H 1 1 1 0 0 0 f = and f = or Introduction to Digital Systems 3 – Combinational ICs
Image of page 4
5 STRUCTURE AND OPERATION OF GATES SWITCH AND mos TRANSISTORS N-TYPE: open ( off ) if V CA < V Tn closed ( on ) if V CA > V Tn V Tn – THE THRESHOLD VOLTAGE FOR N-TYPE SWITCH P-TYPE: open ( off ) if V BC < V Tp closed ( on ) if V BC > V Tp V Tp – THE THRESHOLD VOLTAGE FOR P-TYPE SWITCH Introduction to Digital Systems 3 – Combinational ICs
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
6 Resistance between A and B very high: switch OPEN (off) Resistance between A and B very low: switch CLOSED (on) p-type switch Resistance between A and B very low: switch CLOSED (on) Resistance between A and B very high: switch OPEN (off) n-type switch V Tn V Tp + - V BC pS A B C A B C + - V CA nS V CA V BC (a) NMOS transistor logical symbol PMOS transistor logical symbol drain source gate A B C A B C B A C (b) source drain gate A B C Figure 3.3: a) N-TYPE AND P-TYPE CONTROLLED SWITCHES. b) n mos AND p mos TRANSISTORS.
Image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern