High-Speed Circuits and Systems Laboratory B.M.Yu. High-Speed Circuits and Systems Lab.
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1 High-Speed Circuits and Systems Laboratory B.M.Yu 1
2 Content 1. Introduction 2. Pre-emphasis 1. Amplitude pre-emphasis 2. Phase pre-emphasis 3. Circuit implantation 4. Result 5. Conclusion 2
3 Introduction - Method to compensate signal distortion - Equalization technique from Rx - Pre-emphasis technique from Tx - Amplitude compensation of ISI - Phase compensation of data-dependent jitter - Both pre-emphasis technique is used for compensating signal distortion - Minimizing power consumption while still improving signal integrity 3
4 Pre-Emphasis Amplitude pre-emphasis - At high frequencies, loss is generated by skin loss and dielectric loss - Amplitude pre-emphasis compensate frequency dependent loss in channel 4
5 Pre-Emphasis Amplitude pre-emphasis - Amplitude pre-emphasis compensates frequency-dependent loss. - Transfer function of this stage = ( ) = (1 ) Block diagram for one-tap feed-forward amplitude pre-emphasis driver 1 + ( /2)(1 + )/(1 ) = 1 1+ ( /2) - Additional pole, DC gain decline (Deemphasis) 5
6 Pre-Emphasis Phase pre-emphasis - DDJ (data dependent jitter) is form of DJ (deterministic jitter) that limits the timing margins. - DDJ is related to when the previous transition occurred. - Phase pre-emphasis is for timing margins of data eyes. 6
7 Pre-Emphasis Phase pre-emphasis - DDJ is occurred depending on previous bit relation - Bit sequence must be moved for reduce DDJ - From previous bit relation, we can calculate magnitude of time we must move bit sequence 7
8 Pre-Emphasis Phase pre-emphasis 8
9 Circuit Implantation Transmitter schematic - 4:1 mux that provides amplitude preemphasis - Combinational logic for phase pre-emphasis - Delay generation cells for controlling the clock edge - Duty cycle control cell for each clock phase (process variation) - AND logic for generate 25% duty cycle clock - Implanted in IBM COMS 9SF.(90 nm bulk triple-well CMOS technology) 9
10 Circuit Implantation MUX & Amplitude pre-emphasis - One-tap amplitude pre-emphasis - One bit period time is used for data transmitted sequentially - Other three additional bit periods is available - Amplitude pre-emphasis is added with original data. 10
11 Circuit Implantation DDJ Compensation - Phase pre-emphasis combinational logic - XORs calculates a previous transition in the data - It results in three differential transition detection control bits 11
12 Circuit Implantation Delay generation - Transition control bits control clock delay - Each delay generation block have cascade of three 3bit programmable delay cells. - Control bit select one of two delay cell (Programmable delay & nominal delay) - Each consecutive delay cell is used to handle the timing deviation - Band-pass Buffer to reduce low freq. noise 12
13 Result Total and DDJ as phase pre-emphasis codes for first previous transition 13
14 Result Gb/s was passed through two test channels - 1 st channel: 96 inches of RG-58 channel - RMS jitter reduce from 16.15ps to 11.06ps (first transition, DDJ code: 011) - RMS jitter reduce from 16.15ps to 10.29ps (second transition, DDJ code: 011) 14
15 Result Phase pre-emphasis Gb/s was passed through two test channels - 2 nd channel: 16 inches of FR-4 back plane - Amplitude pre-emphasis open the eye. - Phase pre emphasis reduce jitter from 13.84ps to 10.24ps (DDJ code: 010) 15
16 Result Phase pre-emphasis - Voltage swing tracks the power consumption for both implementations of the transmitter - 3~4 mw/gb/s power consumption 16
17 Conclusion - Equalization technique for amplitude and phase pre-emphasis in bandwidth limited interconnects - Phase pre-emphasis: to compensate data dependent jitter - Combining amplitude and phase pre-emphasis gives flexibility to tailor the signal integrity of data eyes - Architecture builds upon 4:1 multiplexer that allows for efficient implantation of amplitude pre-emphasis - Power : 3~4 mw/gb/s - Transmitter operation : 96 inches of cable, 16inches backplane interconnectors 17
18 Thank you for listening 18
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