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Hi all, Is there any sources help me design current starvation transistors on SR NOR latch ? Thanks...
# analog-design
m
Hi all, Is there any sources help me design current starvation transistors on SR NOR latch ? Thanks in advance for ur replies
l
What application are you planning to use them?
m
I am using them in current starving relaxation oscillator topology , i wanna get power consumption sub nano watt so i aim to make digital blocks like SR latch and buffers starv for current but I don't know the trends to size optimium sizing
l
Ok. What you need is some kind of LDO to lower the latch and buffers supply voltage. Instead of using the typical supply voltage, which is 1.8 V for sky130, you could use something lower, but you need to provide this voltage. So there is the LDO. The problem is to design a nanowatt LDO.
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See this current starved ring oscillator, you can control it by a current. You could do the same with a relaxation oscillator, if all your buffers and latches share the same supply and IDD.
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m
I got it , I have pmos like that M1 and another nmos on same gate do make sure drive same current in PDN and PUN , i control them by signal come from OTA as bias of pmos and took this signal by level shifter or actually it is same as that current mirror but for nmos
The problem i face now is that after i did it all and worked effectively, I connected that oscillator with next block (pulse generator) which contains also starved gates , when i put between them a buffer for interface , it only work when it's not current starved idk why tbh , I really wanna know .. and thank u for ur time ofc and ur info , I really appreciate it
l
Maybe the problem is the buffer. You must be sure that its threshold voltage, or trip point, is within the range of your oscillating signal.
m
It's , cuz I already use one inside oscillator and another in the pulse generator , I tried to put current starving on it like each of them , as 2 attempts but it only work when I remove them , I already reach specs but wanna know the reason cuz it doesn't make sense.
l
Show me your circuit. Maybe you just need a level shifter, so your oscillator signal can have a full amplitude, rail to rail.
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