medical (in english) instrumentation#5
DESCRIPTION
Medical (In English) Instrumentation#5. 2004200467 Jin-ho Cho 2007102861 Jeong-min Cho 2007102860 Eun-jin Cho 2007101329 Song-hee Cha 2003202089 Sun-woong Jin. Contents. (1) Thévenin's theorem and Norton’s theorem (2) Loading Effect (In OP AMP circuit) - PowerPoint PPT PresentationTRANSCRIPT
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<1>2004200467 Jin-ho Cho<2>2007102861 Jeong-min Cho<3>2007102860 Eun-jin Cho<4>2007101329 Song-hee Cha<5>2003202089 Sun-woong Jin
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(1) Thévenin's theorem and Norton’s theorem
(2) Loading Effect (In OP AMP circuit) -Ex)Voltage source -Ex)Current source (3) Load
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In electrical circuit theory, Thévenin's theorem(or Norton) for linear electrical networks
states that any combination of voltage sources, current sources and
resistors with two terminals is electrically equivalent to a single voltage source V(or current source) and a single series resistor R
Ex)
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VAB= 7.5V = Vth
R1 || (R2+R3) = 2kΩ = Rth
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Vth/Rth = 3.75mA
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The gain of an amplifier generally depends on its source and load terminations, so-called loading effects that reduce the gain.
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※
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※Loading Effect
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If an electric circuit has a well-defined output terminal, the circuit connected to this terminal is the load.
The term 'load' also refer to the power consumed by a circuit
Vs=10V
IL
Imax=1A 10W power consumed
RL VL IL
1MΩ
1kΩ
10Ω
10V
10V
10V
1V
10uA
10mA
1A
10A
Overload
1Ω
Imax=1A