CauerLowPassSCCauer lowpass filter with operational amplifiers and switched capacitors 
This information is part of the Modelica Standard Library maintained by the Modelica Association.
The example CauerLowPassSC is a lowpassfilter of the fifth order. It is realized using an switchedcapacitor network with operational amplifiers. The voltage source V is the input voltage (step), and the OP5.out.v is the filter output voltage. The pulse response is calculated.
This model is identical to the CauerLowPassAnalog example, but inverting. To get the same response as that of the CauerLowPassAnalog example, a negative voltage step is used as input.
This model is identical to the CauerLowPassOPV example. But the resistors are realized by switched capacitors (see SwitchedCapacitor). There are two different types of instances, one with a value of R=1
and one with a value of R=1
.
The simulation end time should be 60. Please plot both V.v (which is the inverted input voltage) and OP5.out.v (output voltage). Compare this result with the CauerLowPassAnalog result.
Due to the recharging of the capacitances after switching the performance of simulation is not as good as in the CauerLowPassOPV example.
l1 
Value: 1.304 Type: Capacitance (F) Description: filter coefficient i1 

l2 
Value: 0.8586 Type: Capacitance (F) Description: filter coefficient i2 
c1 
Value: 1.072 Type: Capacitance (F) Description: filter coefficient c1 
c2 
Value: 1 / (1.704992 ^ 2 * l1) Type: Capacitance (F) Description: filter coefficient c2 
c3 
Value: 1.682 Type: Capacitance (F) Description: filter coefficient c3 
c4 
Value: 1 / (1.179945 ^ 2 * l2) Type: Capacitance (F) Description: filter coefficient c4 
c5 
Value: 0.7262 Type: Capacitance (F) Description: filter coefficient c5 
C1 
Type: Capacitor 


C2 
Type: Capacitor 

C3 
Type: Capacitor 

C4 
Type: Capacitor 

C5 
Type: Capacitor 

Op1 
Type: IdealOpAmp3Pin 

G 
Type: Ground 

Op2 
Type: IdealOpAmp3Pin 

Op3 
Type: IdealOpAmp3Pin 

G1 
Type: Ground 

C6 
Type: Capacitor 

Op4 
Type: IdealOpAmp3Pin 

Op5 
Type: IdealOpAmp3Pin 

C7 
Type: Capacitor 

C8 
Type: Capacitor 

C9 
Type: Capacitor 

G2 
Type: Ground 

G3 
Type: Ground 

G4 
Type: Ground 

V 
Type: StepVoltage 

Ground1 
Type: Ground 

R4 
Type: SwitchedCapacitor 

R5 
Type: SwitchedCapacitor 

R8 
Type: SwitchedCapacitor 

R9 
Type: SwitchedCapacitor 

R1 
Type: SwitchedCapacitor 

R2 
Type: SwitchedCapacitor 

R3 
Type: SwitchedCapacitor 

Rp1 
Type: SwitchedCapacitor 

R7 
Type: SwitchedCapacitor 

R10 
Type: SwitchedCapacitor 

R11 
Type: SwitchedCapacitor 