WOLFRAM SYSTEMMODELER

OpAmpDetailed

Detailed model of an operational amplifier

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Information

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

The OpAmpDetailed model is a general operational amplifier model. The emphasis is on separating each important data sheet parameter into a sub-circuit independent of the other parameters. The model is broken down into five functional stages input, frequency response, gain, slew rate and an output stage. Each stage contains data sheet parameters to be modeled. This partitioning and the modelling of the separate submodels are based on the description in [CP92].

Using [CP92] Joachim Haase (Fraunhofer Institute for Integrated Circuits, Design Automation Division) transferred 2001 operational amplifier models into VHDL-AMS. Now one of these models, the model "amp(macro)" was transferred into Modelica.

Reference:
[CP92] Conelly, J.A.; Choi, P.: Macromodelling with SPICE. Englewood Cliffs: Prentice-Hall, 1992

Connectors (5)

p

Type: PositivePin

Description: Positive pin of the input port

m

Type: NegativePin

Description: Negative pin of the input port

outp

Type: PositivePin

Description: Output pin

p_supply

Type: PositivePin

Description: Positive output voltage limitation

m_supply

Type: NegativePin

Description: Negative output voltage limitation

Parameters (31)

Rdm

Value: 2.0e6

Type: Resistance (Ω)

Description: Input resistance (differential input mode)

Rcm

Value: 2.0e9

Type: Resistance (Ω)

Description: Input resistance (common mode)

Cin

Value: 1.4e-12

Type: Capacitance (F)

Description: Input capacitance

Vos

Value: 1.0e-3

Type: Voltage (V)

Description: Input offset voltage

Ib

Value: 80.0e-9

Type: Current (A)

Description: Input bias current

Ios

Value: 20.0e-9

Type: Current (A)

Description: Input offset current

vcp

Value: 0.0

Type: Voltage (V)

Description: Correction value for limiting by p_supply

vcm

Value: 0.0

Type: Voltage (V)

Description: Correction value for limiting by msupply

Avd0

Value: 106.0

Type: Real

Description: Differential amplifier [dB]

CMRR

Value: 90.0

Type: Real

Description: Common-mode rejection [dB]

fp1

Value: 5.0

Type: Frequency (Hz)

Description: Dominant pole

fp2

Value: 2.0e6

Type: Frequency (Hz)

Description: Pole frequency

fp3

Value: 20.0e6

Type: Frequency (Hz)

Description: Pole frequency

fp4

Value: 100.0e6

Type: Frequency (Hz)

Description: Pole frequency

fz

Value: 5.0e6

Type: Frequency (Hz)

Description: Zero frequency

sr_p

Value: 0.5e6

Type: VoltageSlope (V/s)

Description: Slew rate for increase

sr_m

Value: 0.5e6

Type: VoltageSlope (V/s)

Description: Slew rate for decrease

Rout

Value: 75.0

Type: Resistance (Ω)

Description: Output resistance

Imaxso

Value: 25.0e-3

Type: Current (A)

Description: Maximal output current (source current)

Imaxsi

Value: 25.0e-3

Type: Current (A)

Description: Maximal output current (sink current)

Ts

Value: 0.0000012

Type: Time (s)

Description: sampling time

vcp_abs

Value: abs(vcp)

Type: Voltage (V)

Description: Positive correction value for limiting by p_supply

vcm_abs

Value: abs(vcm)

Type: Voltage (V)

Description: Positive correction value for limiting by msupply

I1

Value: Ib + Ios / 2.0

Type: Current (A)

Description: Current of internal source I1

I2

Value: Ib - Ios / 2.0

Type: Current (A)

Description: Current of internal source I2

Avd0_val

Value: 10.0 ^ (Avd0 / 20.0)

Type: Real

Description: differential mode gain

Avcm_val

Value: Avd0_val / 10.0 ^ (CMRR / 20.0) / 2.0

Type: Real

Description: common mode gain

sr_p_val

Value: abs(sr_p)

Type: VoltageSlope (V/s)

Description: Value of slew rate for increase

sr_m_val

Value: -abs(sr_m)

Type: VoltageSlope (V/s)

Description: Negative alue of slew rate for increase

Imaxso_val

Value: abs(Imaxso)

Type: Current (A)

Description: Orientation out outp

Imaxsi_val

Value: abs(Imaxsi)

Type: Current (A)

Description: Orientation into outp

Used in Examples (1)

AmplifierWithOpAmpDetailed

Simple Amplifier circuit which uses OpAmpDetailed