Month: March 2015

INA154 With Gain-Current Shunt Amplifier

By converting the difference amplifier output to a current source using R2, voltage gain can be achieved with R3. R2 compensates the current sensing resistor R2 and increases the current source output impedance. Resistor R5 compensates for the current shunt resistance R4. Perfect compensation for R4 is not possible since the INA154’s internal resistor network is trimmed for precise ratios rather than absolute  values. A buffer amplifier should be used on the output to prevent gain (loading) error. Bypass capacitors are not shown.  (Circuit is created by Neil P. Albaugh,  TI-Tucson)

INA154 With Gain-Current Shunt Amplifier circuit:

Online Simulation of the “INA154 With Gain-Current Shunt Amplifier” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video! 

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Single Supply Absolute Value Amplifier (2) circuit:

Online Simulation of the “Single Supply Absolute Value Amplifier (2)” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video! 

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Capacitive Load Demo circuit

This “Capacitive Load Demo” circuit shows the utility of Tina- TI’s “Control Object” function. The series compensation resistor R1 is  stepped in values of 10, 30, and 50 ohms. The effect on the op amp’s overshoot is shown clearly in the plot below. Likewise, the compensation capacitor C1 or the load capacitance CL can be stepped in value and the effects evaluated. (Circuit is created by Neil P. Albaugh  TI – Tucson)

Capacitive Load Demo circuit:

Online Simulation of the “Capacitive Load Demo” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Bootstrapped Input For High Impedance

Applying a small amount of positive feedback to the input bias current return resistor R3 effectively raises the apparent input resistance seen by an input signal. Without feedback the input resistance is R3 (1M) in parallel with the input resistance of U1 (1E13 ohms); positive feedback applied through the voltage divider R1 & R2 multiplies the effective input impedance of R3 by creating a smaller differential voltage across the resistor. The pole frequencies of various feedback fractions are illustrated by the AC analysis below. A piezoelectric transducer or condenser microphone is modeled by VG1 in series with capacitor C1. Without bootstrapping (positive feedback), the low- frequency cutoff is 1.8kHz but by placing a 100 ohm resistor at R1, this cut-off frequency drops to 2Hz, illustrating the increased Rin. This does not come without penalty, however. Adding bootstrapping also increases the noise gain of the op amp, multiplying its Vos, drift, and noise. Adding a LARGE capacitor in series with R1 can eliminate the amplified DC offset and drift but the low frequency noise will still suffer. Approach large + feedback fractions with caution; instability and susceptibility to external noise pickup can result. (Circuit is created by Neil P. Albaugh,  TI – Tucson)

Bootstrapped Input For High Impedance circuit:

Online Simulation of the “Bootstrapped Input For High Impedance” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video! 

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Voltage-Controlled Current Source Circuit

This circuit is a Howland voltage-controlled current source. It is scaled to provide a 20mA output current with a +1V input voltage. This type of current source can be very useful in industrial applications. A R-R output op amp with an input common-mode range that includes its negative supply rail, such as an OPA251, is required for single- supply operation. For V+ supply over 12V, use Zetex ZXTN2010G (60V, 3W, SOT223, HFE = 100 min). Re- scaling this circuit with other transistors can result in output current capability of a many amps. (Circuit is created by Neil P. Albaugh,  TI – Tucson)

Voltage-Controlled Current Source Circuit:

Online Simulation of the “Voltage-Controlled Current Source” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video! 

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com