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