WOLFRAM SYSTEMMODELER

CauerLowPassSC

Cauer low-pass filter with operational amplifiers and switched capacitors

Diagram

Wolfram Language

In[1]:=
Click for copyable input
SystemModel["Modelica.Electrical.Analog.Examples.CauerLowPassSC"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

The example CauerLowPassSC is a low-pass-filter of the fifth order. It is realized using an switched-capacitor 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. There are two such resistors Rp (of value +1), and Rn (of value -1). In this models the switching clock source is included. In a typical switched capacitor circuit there would be a central clock source.

The simulation end time should be 60. Please plot both V.v (which is the inverted input voltage) and OP5.p.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.

Parameters (7)

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

Components (32)

C1

Type: Capacitor

Description:

C2

Type: Capacitor

Description:

C3

Type: Capacitor

Description:

C4

Type: Capacitor

Description:

C5

Type: Capacitor

Description:

Op1

Type: IdealOpAmp3Pin

Description:

G

Type: Ground

Description:

Op2

Type: IdealOpAmp3Pin

Description:

Op3

Type: IdealOpAmp3Pin

Description:

G1

Type: Ground

Description:

C6

Type: Capacitor

Description:

Op4

Type: IdealOpAmp3Pin

Description:

Op5

Type: IdealOpAmp3Pin

Description:

C7

Type: Capacitor

Description:

C8

Type: Capacitor

Description:

C9

Type: Capacitor

Description:

G2

Type: Ground

Description:

G3

Type: Ground

Description:

G4

Type: Ground

Description:

V

Type: StepVoltage

Description:

Ground1

Type: Ground

Description:

R4

Type: Rn

Description:

R5

Type: Rn

Description:

R8

Type: Rn

Description:

R9

Type: Rn

Description:

R1

Type: Rp

Description:

R2

Type: Rp

Description:

R3

Type: Rp

Description:

Rp1

Type: Rp

Description:

R7

Type: Rp

Description:

R10

Type: Rp

Description:

R11

Type: Rp

Description: