Coverage for klayout_pex/rcx25/r/conductance.py: 96%

1# 

2# -------------------------------------------------------------------------------- 

3# SPDX-FileCopyrightText: 2024 Martin Jan Köhler and Harald Pretl 

4# Johannes Kepler University, Institute for Integrated Circuits. 

5# 

6# This file is part of KPEX 

7# (see https://github.com/martinjankoehler/klayout-pex). 

8# 

9# This program is free software: you can redistribute it and/or modify 

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <http://www.gnu.org/licenses/>. 

21# SPDX-License-Identifier: GPL-3.0-or-later 

22# -------------------------------------------------------------------------------- 

23# 

24 

25from __future__ import annotations 

26from typing import * 

27 

28 

29class Conductance: 

30 """ 

31 An object describing a resistor in terms of conductance 

32 """ 

33 

34 def __init__(self, cond: float = 0.0): 

35 self.cond = cond 

36 

37 def __str__(self) -> str: 

38 return "%.6g" % self.cond 

39 

40 def res(self) -> str: 

41 return "%.6g" % (1.0 / self.cond) 

42 

43 def copy(self) -> Conductance: 

44 return Conductance(self.cond) 

45 

46 def add_parallel(self, other: Conductance) -> Conductance: 

47 self.cond += other.cond 

48 return self 

49 

50 def parallel(self, other: Conductance) -> Conductance: 

51 return self.copy().add_parallel(other) 

52 

53 def add_serial(self, other: Conductance) -> Conductance: 

54 if abs(self.cond) < 1e-10 or abs(other.cond) < 1e-10: 

55 self.cond = 0.0 

56 else: 

57 self.cond = 1.0 / (1.0 / self.cond + 1.0 / other.cond) 

58 return self 

59 

60 def serial(self, other: Conductance) -> Conductance: 

61 return self.copy().add_serial(other)