V-I and I-V Converters

A phase shift circuit using RC components can provide a maximum phase shift of:

• 90°

• 180°

• 270°

• 360°

The main purpose of a voltage follower using an op-amp is to:

• Amplify the input signal

• Invert the signal

• Provide unity gain with high input and low output impedance

• Act as a differentiator

In a V-I converter, the input is a voltage and the output is a:

• Voltage proportional to the square of input

• Constant voltage

• Current proportional to the input voltage

• Logarithmic current

An instrumentation amplifier is best suited for:

• Driving capacitive loads

• Low-frequency oscillators

• Low-noise, high-precision differential signal amplification

• Converting analog to digital signals

The most critical feature of an instrumentation amplifier for industrial sensors is:

• Slew rate

• Power consumption

• High input impedance and high CMRR

• Bandwidth

An ideal integrator circuit has which type of output for a constant DC input?

• Exponential

• Sinusoidal

• Ramp (linear)

• Constant

A practical differentiator circuit is modified using a resistor at the input to:

• Improve integration speed

• Reduce offset voltage

• Reduce high-frequency noise and instability

• Increase phase margin

A logarithmic amplifier uses the exponential relationship of:

• Diode or BJT collector current to voltage

• Resistor voltage to current

• Capacitor charge to voltage

• Op-amp output to input

In an antilogarithmic amplifier, the output voltage is:

• Proportional to the logarithm of input

• Exponential of the input voltage

• Square root of input voltage

• Inversely proportional to input

An I-V converter is most useful when interfacing with:

• Temperature sensors

• Strain gauges

• Photodiodes

• Microcontrollers