mirror of https://github.com/efabless/caravel.git
86 lines
2.9 KiB
Plaintext
86 lines
2.9 KiB
Plaintext
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*---------------------------------------------------------------------------
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* SPDX-FileCopyrightText: 2020 Efabless Corporation
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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*---------------------------------------------------------------------------
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* Simple POR circuit for Caravel current mirror test
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*-------------------------------------------------------------------
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.lib /home/tim/projects/efabless/tech/SW/sky130A/libs.tech/ngspice/sky130.lib.spice tt
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* Note: 20 resistors of length 25um connected in series
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Xres1 vdda vin vss sky130_fd_pr__res_xhigh_po_0p69 l=500
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Xres2 vin vss vss sky130_fd_pr__res_xhigh_po_0p69 l=149
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* voltage sources at 0V for measuring current in each branch
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Vm1 vssm1 vss DC=0
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Vm2 vdda vddm2 DC=0
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Vm3 vdda vddm3 DC=0
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Vm4 vssm4 vss DC=0
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Vm5 vssm5 vss DC=0
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Vm6 vdda vddm6 DC=0
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Vm7 vdda vddm7 DC=0
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* D G S B
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Xm1 casc1 vin vssm1 vss sky130_fd_pr__nfet_g5v0d10v5 w=2 l=0.8 m=1
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Xc1 mir1 casc1 casc1 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=1
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Xm2 mir1 mir1 vddm2 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=8
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Xm3 mir2 mir1 vddm3 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=1
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Xc2 casc2 casc1 mir2 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=1
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Xm4 casc2 casc2 vssm4 vss sky130_fd_pr__nfet_g5v0d10v5 w=2 l=0.8 m=7
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Xm5 casc3 casc2 vssm5 vss sky130_fd_pr__nfet_g5v0d10v5 w=2 l=0.8 m=1
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Xc3 mir3 casc3 casc3 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=1
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Xm6 mir3 mir3 vddm6 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=7
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Xm7 mir4 mir3 vddm7 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=1
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Xc4 vcap casc3 mir4 vdda sky130_fd_pr__pfet_g5v0d10v5 w=2 l=0.8 m=1
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* Check branch currents in each mirror branch.
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* 1st branch should be 240nA
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* 2nd branch should be 30nA
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* 3rd branch should be 4.3nA
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* 4th branch should be 612pA
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*
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* Result: vin sits at 0.7590 (close to 0.7575 target)
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* I(Vm1/2) = 202.80 nA
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* I(Vm3/4) = 26.10 nA (should be /8) actually /7.77
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* I(Vm5/6) = 4.58 nA (should be /7) actually /5.70
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* I(Vm7) = 0.67 pA (should be /7) actually /6.80
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*----------------------------
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* Testbench circuit
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*----------------------------
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Vpwr vdda vss DC=3.3
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Rgnd vss 0 0.01
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Rload vcap vss 1MEG
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*----------------------------
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*----------------------------
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* Testbench control
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*----------------------------
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.control
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op
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print V(vin)
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print I(Vm1)
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print I(Vm2)
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print I(Vm3)
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print I(Vm4)
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print I(Vm5)
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print I(Vm6)
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print I(Vm7)
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.endc
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.end
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