LED Panel meter - Signal integrate phase

Q.  Which phase of 31/2 digit LED Panel meter (7107/7106) to the process of conversion reveals the averaging of signal input for about 1000 clock pulses?
- Published on 25 Sep 15

a. Auto-zero phase
b. Signal Integrate Phase
c. Reference Integrate Phase
d. All of the above

ANSWER: Signal Integrate Phase

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    Discussion

  • Satyawati Patil   -Posted on 09 Oct 15
    3 1/2 digit LED Panel meter basically comprises 7106 IC and LCD. In the 3 1/2 digit LED Panel meter, occurrence of three phases take place throughout the process of conversion. They are auto zero, signal integrate and reference integrate.

    The phase 1 highlights an auto-zero approach. During this phase, charging of capacitor is executed to the integrator offset voltage. This voltage further undergoes the subtraction from the input signal. As the voltage gets subtracted from the input signal, integrator exhibits zero value of offset voltage.

    The phase 2 represents the notion of signal integrate mechanism, where the signal input is averaged for 1000 clock pulses.

    Eventually, the phase 3 specifies the reference integrate. In this phase, low input is configured internally to an offset voltage. Due to this, the reference voltage is averaged back to either '0' V or the offset voltage over the other 1000 clock pulses.

    Therefore, the number of clock pulses which are counted to return to this value is nothing but the digital measurement of an input voltage.

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