1 .A test resistor with length L = 50 ?m and width W = 5 ?m is used to measure t
ID: 2989700 • Letter: 1
Question
1 .A test resistor with length L = 50 ?m and width W = 5 ?m is used to measure the sheet resistance of a resistive layer. What is the sheet resistance if a test voltage of 1 V produces current of I = 0.50 mA?
(a) 50ohm/square
(b) 100ohm/square
(c) 200ohm/square
(d) 300ohm/square
(e) 400ohm/square
(f) 450ohm/square
2. A resistor of 50 ohm is to be designed for fabrication by a standard bipolar integrated-circuit technology incorporating base- and emitter-type diffusion layers. The sheet resistance of the base-type diffusion layer is 200 ohm/square, whereas the sheet resistance of the emitter-type diffusion layer is 5 ohm/square. The minimum width of the diffusion lines is 5 ?m.Which diffusion layer (emitter type or base type) would you use for this resistor, and why? Determine the dimensions
(length and width) of the resistor.
Explanation / Answer
1. R= V/I = 1/0.5m = 200ohms
2. Emitter type was used
Dimensions: 5m---long, 2m----width ====> Area ----5*2 = 10 square meaters
resistence ==> 10square * 5 ohms/square ==> 50 ohms ----which is required
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