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Component 1: Semiconductor Components
Quick questions on Transistor amplifiers: common-emitter, biasing and gain - WJEC A-Level Electronics
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is voltage gain?Show answer
With an unbypassed emitter resistor the voltage gain is set mainly by the ratio of the collector resistor to the emitter resistor. The negative sign is the inversion. (Bypassing the emitter resistor with a capacitor raises the gain but reduces stability, a standard trade-off.)
What is q1?Show answer
A common-emitter amplifier has and an unbypassed . Estimate its voltage gain. [2 marks]
What is q2?Show answer
Explain why the emitter resistor improves the stability of the amplifier's operating point. [2 marks]
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