def test_loopanalysis_incorrect_circuit():
cir = SubCircuit()
assert_raises(ValueError, lambda: FeedbackLoopAnalysis(cir))
cir['probe1'] = LoopProbe('out', gnd, 'out_R2', gnd)
cir['probe2'] = LoopProbe('out', gnd, 'out_R2', gnd)
assert_raises(ValueError, lambda: FeedbackLoopAnalysis(cir))
def test_loopanalysis_numeric():
cir = SubCircuit()
cir['A1'] = VCVS(gnd, 'int', 'out', gnd, g = 10)
cir['R1'] = R('in', 'int')
cir['probe'] = LoopProbe('out', gnd, 'out_R2', gnd)
cir['C2'] = C('int', 'out_R2')
cir['VS'] = VS('in', gnd)
ana = FeedbackLoopAnalysis(cir)
res = ana.solve(np.logspace(4,6), complexfreq=True)
print abs(res['loopgain'])
def test_loopanalysis_viiv():
sympy.var('R1 R2 CL A s')
cir = SubCircuit(toolkit=symbolic)
cir['A1'] = VCVS(gnd, 'int', 'out', gnd, g = A, toolkit=symbolic)
cir['R1'] = R('in', 'int', r=R1)
cir['probe'] = LoopProbe('out', gnd, 'out_R2', gnd, toolkit=symbolic)
cir['R2'] = R('int', 'out_R2', r=R2)
cir['VS'] = VS('in', gnd)
ana = FeedbackLoopAnalysis(cir, toolkit=symbolic)
res = ana.solve(s, complexfreq=True)
assert sympy.simplify(res['loopgain'] - (- A * R1 / (R1 + R2))) == 0
