Digital Integrated Circuits EECS 312
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1 Fujitsu VP2000 IBM 3090S Pulsar 4 IBM 3090 IBM RY6 CDC Cyber 205 IBM 4381 IBM RY4 2 IBM 3081 Apache Fujitsu M380 IBM 370 Merced IBM 360 IBM 3033 Vacuum Pentium II(DSIP) NTT Fujitsu M-780 IBM RY5 Jayhawk(dual) IBM RY7 Prescott T-Rex Mckinley Squadrons IBM GP Pentium Radio Receive for Mesh Maintenance 2-6 ma Typical Current Draw 1 sec Heartbeat 30 beats per sample Sampling and Radio Transmission 9-15 ma Low Power Sleep ma Heartbeat 1-2 ma Time (seconds) Digital Integrated Circuits EECS dickrp/eecs312/ Teacher: Robert Dick Office: 2417-G EECS dickrp@eecs.umich.edu Phone: Cellphone: GSI: Myung-Chul Kim mckima@umich.edu HW engineers SW engineers Current (ma) IBM ES9000 Bipolar CMOS Power density (Watts/cm 2 ) Year of announcement IBM Z9
2 Review Design a non-trivial logic gate. What happens to inverter delay as the driving MOSFET widths are increased? What happens to inverter delay as the driven MOSFET widths are increased? What impact does non-instantaneous rise/fall time have on the propagation delay for the subsequent logic stage? 2 Robert Dick Digital Integrated Circuits
3 Lab 3 Input inverters. Implications of sizing on energy consumption. Derive and explain. 3 Robert Dick Digital Integrated Circuits
4 Short talks Speakers and topics 1 Katherine, Olga, and Matt: Atomic layer deposition. 2 Michael and Heesung: Impact of materials on devices and circuits. 3 Haishan and Guanyu: Optical interconnect. 4 Ike and Dan: ALU design alternatives. 5 Tyler and Megan: Subthreshold circuit applications. 6 Sui Yu, Zhenghong, and Wang Yi: FinFETs. First talk: 4 November, Thursday. Order? 4 Robert Dick Digital Integrated Circuits
5 Lecture plan Robert Dick Digital Integrated Circuits
6 Dependence of delay on width (R) Fix R L C L and vary W. Eventually, self-loading dominates. 6 Robert Dick Digital Integrated Circuits
7 Inverter chain delay optimization Given Size (width) of first inverter in chain, Driven load, Transistors are minimal length, and W p /W n = 2 approximately balances t phl and t plh. Find Optimal number of inverters in chain and Optimal size (width) of each inverter to minimize chain delay. 7 Robert Dick Digital Integrated Circuits
8 Intuition Given two inverters (first fixed) and a large load (C L ), how should the second be sized to minimize delay? C G2 = C G1 (minimal)? C G2 > C L? C G2 = C L? Some other setting? Why? 8 Robert Dick Digital Integrated Circuits
9 Derivation I Let W = W n = W p /2 R = R p = R n T phl = T plh = 0.69RC L C i = 3 W i+1 W unit C unit t p = kr(c int + C L ) = krc int + krc L 9 Robert Dick Digital Integrated Circuits
10 Derivation II Consider the impact of scaling factor S. ( R t p = 0.69 S SC int t p0 : Intrinsic delay. ( 1 + C L t p = 0.69RC int ( 1 + C L t p = t p0 ( 1 + C L SC int Scaling doesn t impact intrinsic delay. Scaling does impact total delay. t p t p0 as S. Diminishing returns with increasing S. ) SC int SC int ) )) 10 Robert Dick Digital Integrated Circuits
11 Consider chain of inverters I Given that t p,chain = t p1 + t p2 + + t pn ( t pi RC 1 + C ) g,i+1 γc g,i N t p,chain = i=1 t p,chain = t p0 C g,n+1 = C L t pi N i=1 ( 1 + C ) g,i+1 γc g,i 11 Robert Dick Digital Integrated Circuits
12 Consider chain of inverters II and γ = C int C g 1 (technology-dependent constant). 12 Robert Dick Digital Integrated Circuits
13 Sketch of derivation For each i, find σt p,chain/σc g,i. Solve for σt p,chain/σc g,i = 0, i=1 N. Result is C g,i+1 C g,i = C g,i C g,i 1. Each stage size geometric mean of previous and next: C g,i = C g,i 1 C g,i+1. Constant factor relates sizing of all adjacent gate pairs. Each stage has same delay. 13 Robert Dick Digital Integrated Circuits
14 Sizing for optimal inverter chain delay N Optimal stage-wise sizing factor: CL C g,1. Minimum path delay: t p,chain = Nt p0 (1 + N CL C g,1 /γ ) 14 Robert Dick Digital Integrated Circuits
15 Example of inverter sizing Given C L = 16C 1. N = 4. Per-stage scaling factor: 4 16C 1 /C 1 = 2 15 Robert Dick Digital Integrated Circuits
16 Optimizing N I Let Φ = C L C g,1 t p,chain = Nt p0 (1 + t p,chain d dn = γ + N Φ ) N Φ γ N Φ ln (Φ) N 16 Robert Dick Digital Integrated Circuits
17 Optimizing N II Set this to zero. Let φ = N Φ 0 = γ + φ φ ln ( φ N) N 0 = γ φ + 1 ln ( φ N) 0 = γ φ N + 1 N ln (φ) N 0 = γ + 1 ln (φ) φ ln (φ) = γ φ + 1 φ = e γ/φ+1 17 Robert Dick Digital Integrated Circuits
18 Optimizing N III Hard to deal with this for γ 0. Consider implications for γ = 0. φ = e 18 Robert Dick Digital Integrated Circuits
19 Optimal stage sizing factor Optimal tapering factor for γ = 0: e for γ = Robert Dick Digital Integrated Circuits
20 t p,chain (Φ) Φ Unbuffered N = 2 Optimal N ,000 1, ,000 10, Robert Dick Digital Integrated Circuits
21 Buffering example 21 Robert Dick Digital Integrated Circuits
22 Upcoming topics Interconnect. Alternative logic design styles. 22 Robert Dick Digital Integrated Circuits
23 Lecture plan Robert Dick Digital Integrated Circuits
24 assignment 2 November, Tuesday: Rest of Lab 3. 2 November, Tuesday: Read Sections and in J. Rabaey, A. Chandrakasan, and B. Nikolic. Digital Integrated Circuits: A Design Perspective. Prentice-Hall, second edition, Don t put off the reading or you might be overloaded when more homework problems are assigned. 4 November, Thursday: First short talk. 24 Robert Dick Digital Integrated Circuits
Digital Integrated Circuits EECS 312. Review. Dependence of delay on width (R) Lab 3. Intuition. Inverter chain delay optimization
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