Strobe signal, A/D converters

Chris Lesch (lush@intergate.bc.ca) Mon, 4 Dec 2000 18:39:34 -0800 

From: "Chris Lesch" <lush@intergate.bc.ca>
Subject: Strobe signal, A/D converters
Date: Mon, 4 Dec 2000 18:39:34 -0800



What is the correct answer for these 2 questions?

a) The STROBE signal of a parallel printer interface should be set low when:

     (a) the BUSY signal is high
     (b) the BUSY signal is low
     (c) the data lines contain the next character to print
     (d) (a) and (c)
     (e) (b) and (c)
     (f)  none of the above

b)  You need to A/D convert a slowly-changing analog signal generated by a
     remote sensor.  The sensor is connected to the A/D by a long pair of
wires
     running through an industrial plant with many electrical machines.  You
notice
     that the signal at the input to the A/D converter is very noisy.  Which
of the
     following devices might help you resolve this problem:

     (a) a multiplexer
     (b) a low-pass filter
     (c) a sample-and-hold
     (d) a differential amplifier
     (e) (b) and (d)
     (f)  (c) and (d)
     (g) (a) and (c)
     (h)  none of the above