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Draw a labelled circuit diagram of a transistor acting as a common emitter amplifier. What is meant…
(i)[3.0]
Draw a labelled circuit diagram of a transistor acting as a common emitter amplifier. What is meant by phase reversal?
Draw: Circuit diagram of an npn or pnp transistor acting as a common emitter amplifier
Must show: Common emitter configuration with emitter grounded, Base-emitter forward biased with input signal, Collector-emitter reverse biased with output across load, Input AC signal and inverted 180 degree out-of-phase output signal
(ii)[2.0]
Draw the symbol of a NAND gate and write its truth table.
Draw: Logic symbol of a 2-input NAND gate
Must show: AND gate shape with inversion bubble at output, Two input lines labelled A and B, Output line labelled Y
Answer
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From ISC 2020 Physics Paper 1, question 22(b).