Understanding Amplifier & Receiver Power Specifications - eCoustics.com. Current-to-voltage converter. Fig. 1. Simplified transimpedance amplifier In electronics, a transimpedance amplifier, (TIA) is a current to voltage converter, most often implemented using an operational amplifier. The TIA can be used to amplify the current output of Geiger–Müller tubes, photo multiplier tubes, accelerometers, photo detectors and other types of sensors.
Current to voltage converters are used with sensors that have a current response that is more linear than the voltage response. This is the case with photodiodes where it is not uncommon for the current response to have better than 1% linearity over a wide range of light input. DC Operation[edit] In the circuit shown in Fig. 1 the photodiode is connected between ground and the inverting input of the opamp. Fig. 2. And The above equation is the DC and low frequency gain of a transimpedance amplifier. Fig. 2 shows a TIA with the photodiode driven by a laser diode and operating in the photoconductive mode. Bandwidth and Stability[edit] Fig. 3. Where Fig. 4. Transconductance. Transconductance is the property of certain electronic components. Conductance is the reciprocal of resistance; transconductance is the ratio of the current change at the output port to the voltage change at the input port.
It is written as gm. For direct current, transconductance is defined as follows: For small signal alternating current, the definition is simpler: Terminology[edit] Transresistance[edit] Transresistance, infrequently referred to as mutual resistance, is the dual of transconductance. Devices[edit] Vacuum tubes[edit] For vacuum tubes, transconductance is defined as the change in the plate(anode)/cathode current divided by the corresponding change in the grid/cathode voltage, with a constant plate(anode)/cathode voltage. Field effect transistors[edit] Similarly, in field effect transistors, and MOSFETs in particular, transconductance is the change in the drain current divided by the small change in the gate/source voltage with a constant drain/source voltage. Amplifiers[edit] Abbreviations and acronyms dictionary: Find definitions for over 4,219,000 abbreviations, acronyms, and initialisms.
Glossary of Electrical Engineering Terms - Maxim EE Glossary. Slew Rate. A recommended attitude for hifi amplifiers is about 1 kHz, measured with different amplitudes and also loads. Of course the 4 ohms or 8 ohms, in addition, under capacitive load (e.g. > 10 nF parallel to the Ohm's load - it is to try). Under capacitive load weaknesses come particularly pronouncedly to the appearance, high overshooting because of missing bandwidth and high dynamic internal resistance with higher frequencies. Some bad amplifiers show however already under Ohm's load violent overshoot. Comprising it doesn't matter if the rise reach 7 V/µs or 9 V/µs, determing is the the dimension and the variation of the slew rate under capactive and resistive loads.
In the case of a measurement of the rate of rise of an amplifier, it is naturally meaningful to represent and compare input port and output channel at the same time on the oscillograph. Some dimensions, (only dimension, please don't put it on a pair of gold scales!!!)