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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Thévénin Equivalent Circuit

The Thévénin Equivalent of a circuit consists of a Thévénin voltage source in series with a Thévénin resistor and is valid for any load. In AC circuits a Thévénin equivalent circuit is valid for a single frequency.

Original circuit before Thévénin Equivalent - RF Cafe

Original Circuit Prior to the Thévénin Equivalent

Thévénin Equivalent drawing schematic - RF Cafe

Thévénin Equivalent

The Thévénin voltage is the open circuit voltage at the output. calculation is straightforward node or loop circuit analysis. Using loop analysis:

Voc:  [8 * I1] + [(8+2+6) * I2] - [6 * I3] = 1 A

I2 = ½A ==> Voc = ½A * 6

Ω= 3 V = Vth

Calculate the Thévénin resistance from the open circuit voltage and the short circuit current

(set RL = 0 and solve for I3) using Ohm's Law.

Rth = Voc / Isc = 3 V / [(4/9) A] = 27 / 4 Ω = Rth

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