LM148-N, LM248-N, LM348-N
SNOSBT2E –MAY 1999–REVISED MARCH 2013
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Typical Applications—LM148
Figure 19. One Decade Low Distortion Sinewave Generator
fMAX = 5 kHz, THD ≤ 0.03%
R1 = 100k pot. C1 = 0.0047 μF, C2 = 0.01 μF, C3 = 0.1 μF, R2 = R6 = R7 = 1M,
R3 = 5.1k, R4 = 12Ω, R5 = 240Ω, Q = NS5102, D1 = 1N914, D2 = 3.6V avalanche
diode (ex. LM103), VS = ±15V
A simpler version with some distortion degradation at high frequencies can be made by using A1 as a simple inverting
amplifier, and by putting back to back zeners in the feedback loop of A3.
Figure 20. Low Cost Instrumentation Amplifier
VS = ±15V
R = R2, trim R2 to boost CMRR
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