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Unformatted text preview: EE 4770 Homework 1 Due: 8 February 1995 Problem 1: Offset can be adjusted in an inverting amplifier by applying an appropriate voltage to v + . Show how to choose components for such an amplifier so that there is an output of x given an input of v A = a + xb , where a is a voltage and b is a dimensionless negative number. (Note that offset and gain cannot be independently adjusted.) Problem 2: Design a system to convert temperature, x , to a floatingpoint number H ( x ) = x C , the temperature in degrees Celsius. Temperature is to be measured using a transducer with response H t ( x ) = R (1 + ax + bx 2 ), where R = 100, a = . 064 K , and b = . 00107 K 2 . Temperature will vary in the range [ 10 C , 50 C]. A 16bit, 5V ADC, H ADC(5V , 16) ( y ) is to be used. The temperature is to be written into a variable named tee . Use the gain/offset circuit for conditioning. Be sure to make appropriate use of the ADC input range. (The ADC input should not vary, for example, from 4 to 4.1 volts.) Show all component and supply values. Show pseudocode to convert the ADC output to a floating point number, the temperature in degrees Celsius. Hint: Remember that the conditioning circuit must be designed so the ADC input is between 0 and 5V . Since the ADC output will be computerprocessed the conditioning circuit does....
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 Fall '99
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