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TS616 数据表(PDF) 15 Page - STMicroelectronics |
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TS616 数据表(HTML) 15 Page - STMicroelectronics |
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15 / 27 page  TS616 15/27 INTERMODULATION DISTORTION PRODUCT Non-ideal output of the amplifier can be described by the following series: due to non-linearity in the input-output amplitude transfer, where the input is Vin=Asinωt, C0 is the DC component, C1(Vin) is the fundamental and Cn is the amplitude of the harmonics of the output sig- nal Vout. A one-frequency (one-tone) input signal contrib- utes to harmonic distortion. A two-tone input sig- nal contributes to harmonic distortion and inter- modulation product. The study of the intermodulation/distortionfor a two-tone input signal is the first step in character- izing the driving capability of multi-tone input sig- nals. In this case : and : In this expression, we recognize the second order intermodulation IM2 by the frequencies ( ω 1-ω2) and ( ω 1+ω2) and the third order intermodulation IM3 by the frequencies (2 ω 1-ω2), (2 ω 1+ω2), ( −ω 1+2ω2) and (ω1+2ω2). The measurement of the intermodulation product of the driver is achieved by using the driver as a mixer by a summing amplifier configuration. In this way, the non-linearity problem of an external mix- ing device is avoided. Figure 45: Non-inverting Summing Amplifier for Intermodulation measurements The following graphs show the IM2 and the IM3 of the amplifier in different configurations. The two-tone input signal was generated by the multi- source generator Marconi 2026. Each tone has the same amplitude. The measurement was per- formed using a HP3585A spectrum analyzer. Vout C 0 C 1 V in C 2 V 2 in …C n V n in ++ + = V in A ω 1 t sin B ω 2 t sin + = V out C 0 C 1 A ω 1 t sin B ω 2 t sin + () + = C 2 +A ω 1 t sin B ω 2 t sin + () 2 … C n A ω 1 t sin B ω 2 t sin + () n + V out C 0 C 2 A 2 B 2 + 2 --------------------- + = C + 1 A ω 1 t sin B ω 2 t sin + () C 2 2 ------- A 2 2 ω 1 cos t B 2 2 ω 2 t cos + – 2 +C 2 AB ω 1 ω 2 – ()t ω 1 ω 2 – () cos – t cos () 3 C 3 4 ------- + A 3 ω 1 t sin B 3 ω 2 t2A 2 B ω 1 t sin 2AB 2 ω 2 t sin ++ sin + C 3 A 3 3 ω 1 t sin B 3 3 ω 2 t sin + + 3C 3 A 2 B 2 ------------------------ +2 ω 1 ω 2 – ()t sin 1 2 --- – 2 ω 1 ω + 2 ()t sin 3C 3 A 2 B 2 ------------------------ + ω 1 2 ω + 2 – ()t sin 1 2 --- – ω 1 2 ω + 2 ()t sin … C n V in () n + Vout diff. 300 Ω 910 Ω +Vcc 100 Ω 50 Ω 49.9 Ω 49.9 Ω 1/2 TS616 -Vcc √2:1 1/ 2 TS616 910 Ω 300 Ω Rout1 Rout2 1k Ω 1k Ω 1k Ω 1k Ω 49.9 Ω 49.9 Ω 49.9 Ω 49.9 Ω 50 Ω 100 Ω 1: √2 50 Ω 100 Ω 1: √2 Vin1 Vin1 _ + _ + Vout diff. 300 Ω 910 Ω +Vcc 100 Ω 50 Ω 49.9 Ω 49.9 Ω 1/2 TS616 -Vcc √2:1 1/ 2 TS616 910 Ω 300 Ω Rout1 Rout2 1k Ω 1k Ω 1k Ω 1k Ω 49.9 Ω 49.9 Ω 49.9 Ω 49.9 Ω 50 Ω 100 Ω 1: √2 50 Ω 100 Ω 1: √2 Vin1 Vin1 _ + _ + |
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