LMH6551Q_15 Datasheet, PDF (17/26 Pages) Texas Instruments – Differential, High Speed Op Amp

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LMH6551Q
SNOSB95E – NOVEMBER 2011 – REVISED MARCH 2013
V_IN * A_V * N
V_L =
¨§ ^{2 ROUT * N2}
¨
©
R_L
+1
WHERE V_IN = DIFFERENTIAL INPUT VOLTAGE
N = TRANSFORMER TURNS RATIO =
§
¨
SECONDARY
¨© _PRIMARY
A_V = CLOSED LOOP AMPLIFIER GAIN
R_OUT = SERIES OUTPUT MATCHING RESISTOR
R_L = LOAD RESISTOR
V_L = VOLTAGE ACROSS LOAD RESISTOR
Figure 34. Calculating Transformer Circuit Net Gain
100: TWISTED PAIR
375
200: 2:1 (TURNS)
375
+
a 4 VPP
V_CM
-
375
375
A_V = 1
V_CM
200:
1 V_PP
R_L = 100:
Figure 35. Transformer Out Low Impedance Load
50: COAX
375
100: 2:1 (TURNS)
375
+
a 4 VPP
V_CM
-
375
375
C₁
100:
1 V_PP
GAIN = 1
C₁ IS NOT REQUIRED IF V_CM = GROUND
Figure 36. Driving 50Ω Test Equipment
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