lab3_finalreport - Purpose Interface board n Embedded board...

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Purpose Interface board n Embedded board n digital storage oscilloscope n PGA(Programmable Gain Amplifier) z ~ . n PGA ° ~ signal z< ~ ± ± oscilloscope signal e n ± channel 1 signal n . z< ± signal ~ ± , z< ± range signal , z * ± ± ± ± . 1) Show and analysis the experiment results. ~ ~ K ~ . 1 < ~ ± op amp ± ± O. n feedback loop K 6 ± ± * h 6 n gain * . stage op amp gain n -1 n, -2.5 n -5 n, -10 < ~ stage op amp -1 n -10 ± O . ) ü “ ± op amp gain n 1 n, 2.5 n, 5 n, 10 n, 25 n, 50 n, 100 e ± ± ± O . ± ± ± O voltage division z < ~ software n input O GPIO ~ hardware z ~ ± ± . n voltage division h6 t ± T ² l ³ * . 2 ´ * ‚ Æ . input gain Output -10mV ~ +10mV 100 -1V ~ +1V -20mV ~ +20mV 50 -40mV ~ +40mV 25 -100mV ~ +100mV 10 -200mV ~ +200mV 5 -400mV ~ +400mV 2.5 -1V ~ +1V 1 z< ~ µ ‚ . Cutoff frequency e 180kHz ) ~ . ± O 100kHz ) ± 1 < * . 2) Explain the code briefly K ~ h * . 1 ~ . <gpio.h> #define GPIO_GAIN_SETLECT1_1 23 // ) ~ . n 1stage opamp n 23 n #define GPIO_GAIN_SETLECT1_2 24 // 24 O 2stage opamp n 25 n ± #define GPIO_GAIN_SETLECT2 25 // ) . #define MASK_GAIN_S1_1 (1 << GPIO_GAIN_SETLECT1_1) // ) mask .
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