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Unformatted text preview: EE 4770 Homework 1 Due: 5 February 1999 Problem 1: Design a circuit and an interface routine to convert temperature, x ∈ [200 K , 300 K], to a floating point number H ( x ) = x/ K to be written to variable temp . Temperature is to be measured using an integrated temperature sensor , a sensor with model function H t ( x ) = x μ A K . The circuit should use a 10 V, 16-bit ADC, H ADC (10 V , 16) . The full range of the ADC input does not have to be used (in this problem). • Show a schematic of the circuit showing all component and supply values. (The symbol for an integrated temperature sensor is a current source.) • Show pseudocode or C code for the interface routine. Solution: Can use either an inverting amplifier or put the ITS in series with a resistor. The solution below uses the inverting amplifier, with the integrated temperature sensor connected to a- 10 V source. Given: H t ( x ) = x μ A K . For inverting amplifier H c ( y ) = yR B . Choose R B so that ≤ H c ( H t ( x )) ≤ 10 V for x ∈ [200 K , 300 K] . Since voltage increases with temperature and the minimum....
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- Fall '99