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TS615 数据表(PDF) 15 Page - STMicroelectronics |
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TS615 数据表(HTML) 15 Page - STMicroelectronics |
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15 / 27 page  TS615 15/27 INTERMODULATION DISTORTION PRODUCT A non-ideal output of the amplifier can be de- scribed by the following development : due to a non-linearity in the input-output amplitude transfer. In the case of the input is Vin=Asinωt, C0 is the DC component, C1(Vin) is the fundamental, Cn is the amplitude of the harmonics of the output signal Vout. A one-frequency (one-tone) input signal contrib- utes to a harmonic distortion. A two-tones input signal contributes to a harmonic distortion and in- termodulation product. This intermodulation product or intermodulation distortion study of a two-tones input signal is the first step of the amplifier characterization of driving capability in the case of a multi-tone signal. 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. By this way, the non-linearity problem of an external mixing device is avoided. Figure 45 : Non-inverting Summing Amplifier The following graphs show the IM2 and the IM3 of the amplifier in different configuration. The two-tones input signal is achieved by the multi- source generator Marconi 2026. Each tone has the same amplitude. The measurement is achieved by the spectrum analyzer HP3585A. 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 + Rg1 Rfb1 Vout diff. 11 10 13 +Vcc 100 Ω 50 Ω 49.9 Ω 49.9 Ω 1/2 TS615 -Vcc √2:1 1/2 TS615 Rfb2 Rg2 33 Ω 33 Ω 1k Ω 1k Ω 1k Ω 1k Ω 49.9 Ω 49.9 Ω 49.9 Ω 49.9 Ω 50 Ω 400 Ω 1: √2 50 Ω 400 Ω 1: √2 Vin1 Vin2 _ + _ + No rth Hills 0 315PB North Hills 0315P B No rth Hills 0 315PB Rg1 Rfb1 Vout diff. 11 10 13 +Vcc 100 Ω 50 Ω 49.9 Ω 49.9 Ω 1/2 TS615 -Vcc √2:1 1/2 TS615 Rfb2 Rg2 33 Ω 33 Ω 1k Ω 1k Ω 1k Ω 1k Ω 49.9 Ω 49.9 Ω 49.9 Ω 49.9 Ω 50 Ω 400 Ω 1: √2 50 Ω 400 Ω 1: √2 Vin1 Vin2 _ + _ + No rth Hills 0 315PB North Hills 0315P B No rth Hills 0 315PB |
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