| *--------------------------------------------------------------------------- |
| * 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 |
| |
