True Single-Phase Clock (TSPC): The Design of CMOS True Single-Phase Clock Dividers

True Single-Phase Clock (TSPC) showcases the ability to achieve high-performance frequency divider

This program is operated by HSPICE using 90nm PTM technology at 1V power supply. It combines various members of the CMOS TSPC logic gates family, achieving a maximum operating frequency of 25GHz with a power consumption of 7.432mW.

Single-Phase Clock (TSPC)

For the first DFF, I enhanced its operating speed by using ratioed logic structures (𝑃𝐶 − 𝑃𝑁 − 𝑁𝐶) and sizing the second stage with a high ratio to minimize propagation delay. The width of the first and third stages will be determined based on the size of the 𝑃𝑁 logic. For the others, I used ratio-less logic (𝑃𝐶 − 𝐶𝑁 − 𝑁𝐶) to reduce power dissipation, and it offers the same robustness as the CC type. The labels 𝑃, 𝑁, and 𝐶 are referenced from this here.

Demo

Demo made by Zhe-Wei Pan

Installation

Ensure you have obtained the SSH_key and config from Zhe-Wei Pan and copied it to the following directory:

cp SSH_KEY ~/.ssh/key/SSH_KEY
cp config ~/.ssh/key/config

Install True Single-Phase Clock (TSPC) with the following command

git clone git@github.com:QBlobster/true-single-phase-clock.git

Usage

Make sure to start from C shell by tcsh and set the environment variable for HSPICE.

# Change to C shell
tcsh

# set library path
source /usr/cad/synopsys/CIC/hspice.cshrc

You can modify the spice netlist file in TSPC.sp to analyze the differnet circuits.

Run hspice to generate the waveform, measure the rise/fall time and power, and ensure the duty cycle falls within the range of 45% to 55%:

# Simulate TSPC
hspice -i TSPC.sp -o ./lis/TSPC.lis

The waveform result will be stored in ./lis/TSPC.tr0. You can use wv to view the waveform.

	outA	outB	outC
Rise Time	1.946×10-11	3.633×10-11	7.229×10-11
Fall Time	1.889×10-11	4.010×10-11	7.751×10-11
Rise Time/Cycle	0.2443	0.2262	0.2281
Rise Time/Cycle	0.2371	0.2497	0.2422
Duty Cycle	50.65%	50.00%	50.40%

You can find the detailed result in ./lis/TSPC.mt0.

cd lis

cat TSPC.mt0

    #TSPC.mt0
    ...
    clkt =  4.119e-11
    clkpw =  1.891e-11
    power =  7.436e-03	#Power
    tftoa =  7.965e-11
    tra =  1.946e-11	#Rise Time of outA
    tfa =  1.889e-11	#Fall Time of outA
    pwa =  4.034e-11
    pwba =  3.930e-11
    trpa =    0.2443	#Rise Time/Cycle of outA
    tfpa =    0.2371	#Fall Time/Cycle of outA
    duty_cycleoa =    0.5065	#Duty Cycle of outA
    duty_cycleboa =    0.4935
    duty_cycleclk =    0.4590
    tftob =  1.606e-10
    trb =  3.568e-11	#Rise Time of outB
    tfb =  4.024e-11	#Fall Time of outB
    pwb =  8.086e-11
    pwbb =  7.973e-11
    trpb =    0.2221	#Rise Time/Cycle of outB
    tfpb =    0.2505	#Fall Time/Cycle of outB
    duty_cycleob =    0.5035	#Duty Cycle of outB
    duty_cyclebob =    0.4965
    tftoc =  3.200e-10
    trc =  7.299e-11	#Rise Time of outC
    tfc =  7.751e-11	#Fall Time of outC
    pwc =  1.613e-10
    pwbc =  1.587e-10
    trpc =    0.2281	#Rise Time/Cycle of outC
    tfpc =    0.2422	#Fall Time/Cycle of outC
    duty_cycleoc =    0.5040	#Duty Cycle of outC
    duty_cycleboc =    0.4960
    temper =   27.0000

Contributing

Contributions are always welcome!

Please contact Zhe-Wei Pan.

License

MIT