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目前遇到電壓小一點點,電路無法產省正常的波形 |
解決方法:
我發現電壓如果寫VDD/2-dv 這樣的算法,好像輸出就有問題,發現了 VDD/2-VDD/2^12 ,這樣寫法會讓給的電壓有問題 ,只要寫次方項就有問題,改成VDD/4096
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Mintour的電壓變化,對Napoleon的電壓變化影響小 ,有可能是跟M4 mos 的size有關 |
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第三個VCDL 產生不出脈衝波的原因 |
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more detail about the three VCDL |
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最早可以讓SS corner 可以work的 參數 |
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SCAN M0 to gain the variation |
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SS corner situation , Ya my guess is right , but this is for VCDL tests alone |
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SCAN Mrst to gain the variation |
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SS corner situation , Ya my guess is right , but this is for VCDL tests alone
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當電路在DATA放 inverter 出來結果會相反
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上面屬於PD_N 的數字 下面是屬於PD_P |
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VCDL array 如果這樣皆是不會起振,不管你是偶數級還是奇數級 |
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這樣會有收斂問題 ,還是不能跑 ,但把Vctrlp Vctrln 電壓條好後就可以跑了 |
看起來有沒有加DTW 不影響 VCDL的輸出頻率 , 只有震盪次數的問題
Time Domain Camparator 兩種狀況 右邊輸出預設為11才會運作出來
目目前使用的 |
SR -Latch 使用nor Gate |
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當Vip > Vin DTWP=1 , DTWN=0 Outp=1 Outn=0 |
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當Vip < Vin DTWP=0 , DTWN=1 Outp=0 Outn=1 |
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SS corner 隨著電容增加 ,電壓脈衝波越來越難升上去
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電容增大SS corner , dekay 時間基本上會增加 |
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Cap 增加 上升速度越慢 SS corner |
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M0 PMOS length 逐漸增加 ,上升速度越慢 ,Delay越長 |
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Length 越大 ,充電速度越慢 , X Pmos |
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可以看到輸入mos 隨著mos增大 ,delay時間降低 ,上升速度越快 ,但變化不大 ,SS corner |
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掃描VCDL 輸入Vip 的 Mos , 可以看到電壓越大 , delay 時間越小 , 上升速度越快 |
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VCDL mos輸入端 隨著mos增大 |
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當Vctrl_n 電壓太小 ,會產生不出CLK ,根本就無法進行比較 |
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你可以看到我已經在DTW 雙端控制電壓Vctrlp &Vctrln都用0.5V ,但脈衝波速度仍然有差可見寄生電容不一樣 |
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條VCDL M0 pmos 的M ,M越大 充電速度越慢 ,分配的時間越少 ,震盪次數減少 |
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可以知道M0 Pmos 如果width Finger越大 充電速度也是越慢 |
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條M0 PMOS 的 Length 會導致放電速度變慢 ,差異非常大 |
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Mrst 掃描 M只有影響放電速度 當width增加,放電時間變慢而已 |
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Length增加 放電速度變慢 |
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Data那邊掃描Cap, 的掃描圖 |
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當 Vip 電壓大於 Vin 時 的狀況 |
SR Latch
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S=1 R=0 --> Q=1 ,QB=0 |
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同樣狀況 , FS SS corner Q上升更慢 |
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S=0 R=1 --> Q=0 ,QB=1
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S=1 R=0 --> Q=1 ,QB=0 真的時間差到1n SR latch 會比錯 ,應該是要Q 跳起來 |
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SR latch delay 10n , S=1 R=0 --> Q=1 ,QB=0 ,感覺Q 充電需要時間,不能被其他打斷
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SR Latch 10p delay function work
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TT |
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FF |
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SS |
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SF |
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FS |
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Pmos size 小 ,充電電流不夠 |
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掃描仍然不行 ,已經把PMOS length 改成0.18u ,掃描M=10-30 ,仍然運作不了 |
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拿掉DTW輸出電容。會讓DTW運作不了 |
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TPSC 條的差異 |
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pd_n_clk +pd_n_d= n寄生電容 , pd_p_clk+pd_p_d= p寄生電容 |
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隨著dummy增加 ,確實時間差距越來越接近 |
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VCDL 上下參數都一樣狀態下 , 最終DTW 的結果 |
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TSPC_with_set_Original every corner 目前調出來 |
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TSPC_with_set_Original every corner Wave |
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第二種TSPC_with_set 的delay時間 |
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TSPC_with_set evey wave |
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目前電路調整的方向及邏輯 |
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不同的Voltage control |
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想辦法讓SS corner 充電速度變快 |
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發現VCDL 每一級stage 的時間沒有成比例的增加 |
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FS corner 由 1u -1m 都沒什麼變化 ,很有問題 ,要調一下,試看看 |
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掃描M7 finger=1~20 , 最佳解為finger=3 |
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發現SS corner -25 -15 時無法運作 |
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FS corner input referred noise 5m , DOUT 也只有647.058mV ,超奇怪的 |
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VCDL M=3-9 TT corner |
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VCDL M=1-10 FF corner |
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VCDL Length=0.3u-2u , Length=2u 可以變為0.82mV |
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VCDL SS 4個 VCDL 脈衝波 , mench 感覺5個以上VCDL ,波就時間來不急 |
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normal nmos SS corner M=1-10 |
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但不會成功運作 |
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TT corner 運作速度太快, DFF 來不及充放電,造成沒有如期運作 |
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Function ERROR |
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