*---------------------------------------------------------------------------
* 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
*-------------------------------------------------------------------
*
* Architecture: see simple_por.spice
* Response of this circuit by ngspice simulation is a ~15ms delay.
*-------------------------------------------------------------------

.lib /home/tim/projects/efabless/tech/SW/sky130A/libs.tech/ngspice/sky130.lib.spice tt
.include /home/tim/projects/efabless/tech/SW/sky130A/libs.ref/sky130_fd_sc_hvl/spice/sky130_fd_sc_hvl.spice
.include simple_por.spice

*----------------------------
* Testbench circuit
*----------------------------
Vpwr vdda vss DC=0 PWL(0.0 0 100u 0 5m 3.3)
Vdig vccd vss DC=0 PWL(0.0 0 300u 0 5.3m 1.8)
Rgnd vss 0 0.01
Cload1 porb_h  vss 1E-12
Cload2 por_l  vss 1E-12
Cload3 porb_l vss 1E-12
Xpor vdda vccd vss porb_h por_l porb_l simple_por
*----------------------------

*----------------------------
* Testbench control
*----------------------------
.control
tran 10u 20m
plot porb_h
plot por_l
plot porb_l
.endc

.end