Sensorsignalverstärker MTI
Multi-channel transimpedance amplifier (TIA)With the MTI series, MAZeT provides a family of multi-channel amplifier ICs (current-to-voltage conversion transimpedance amplifiers) for sensors with current output. These are distinguished, among other things, by a programmable bandwidth and high amplification.
The ICs are offered in different RoHS compliant housings or - within the scope of customer projects - are also available as ‘naked’ chips (die) for Chip-On-Board (COB) assembly.
The MTI series is currently available in two types, which differ in amplification, noise, bandwidth and operating voltage.
| Transimpedance amplifiers (TIAs)
are the preferred choice in industrial measurement for the
transformation and amplification of the smallest currents in
optoelectronic sensors. The transmission function of a TIA is formed by
Ohm’s Law, whereby the resistor required for the current-to-voltage
conversion is connected in the feedback path of an operational
amplifier. The value of this resistor thereby determines the
amplification factor of the TIA. The advantage of this wiring
technique, compared to the simple conversion of the current with a
passive resistor, lies in the control of the voltage at the sensor
input to the applied reference voltage. If the input-side current
sensor (e.g. photodiode) is connected between the input of the
transimpedance amplifier, that is, the inverting input of the
operational amplifier, and the reference voltage is applied to the
non-inverting input of the operational amplifier, then the current
sensor operates into an ideal short-circuit, that is, it operates as a
pure current source with no voltage-dependent factor. This means that a
current-correct measurement is carried out. In addition, this wiring
technique increases the signal bandwidth because of the effective
cancellation of the sensor capacitance. Also, noise is minimized. |
Illustration: Examples of MCM with MTI04C on board:
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| MTI04CS/ MTI04CQ |
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