= Pete Semig
{c}
\b[Pete Semig] is an analog-electronics engineer and technical author associated with <Texas Instruments>. A2013 company reference design identifies his applications work on difference and <instrumentation amplifiers>. The same document credits Peter Semig on its title page and uses Pete Semig in its author biography.<10 µA-10 mA, Single-Supply, Low-Side, Current Sensing Solution by Pete Semig>[title page and About the Author, printedp13]{ref}
His current-measurement work connects a small electrical signal to an instrument's usable range. A <shunt resistor> produces an <electric potential difference> proportional to current, and an amplifier makes that difference easier to measure. The2013 reference describes a single-supply low-side <current sensing> design for a stated10microampere-to10milliampere range.<10 µA-10 mA, Single-Supply, Low-Side, Current Sensing Solution by Pete Semig>[Circuit Description and Theory of Operation]{ref}
For an original simplified example, choose a1ohm shunt and current $I=20\,\mathrm{mA}$. The shunt drop is $V=IR=20\,\mathrm{mV}$, and a voltage gain of50 gives a1volt output. The shunt also dissipates
$$
P=I^2R=(0.020)^2(1)=0.0004\,\mathrm W.
$$
Thus the measurement element changes the circuit it measures, through both its voltage drop and its dissipation. An input-equivalent amplifier offset of100microvolts would correspond to0.1milliampere in this example. These selected values do not reproduce the reference design.
Semig's <Integrator Circuit by Pete Semig> similarly states the operating limits behind an <integrating amplifier>: capacitor feedback gives an ideal integral, while offsets, finite bandwidth and the DC feedback path limit practical behavior.<Integrator Circuit by Pete Semig>[pp1–2, Design Description and Design Notes]{ref} His technical contribution is to connect circuit equations with component choices and the conditions under which a measurement remains interpretable.
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