Which type of amplifier circuit is used in a...

🔍 Key Concepts

• Link coupling in RF circuits – how energy is transferred from an RF power amplifier to a load or antenna through a coupling link or coil • Symmetrical vs. single-ended amplifier configurations – think about circuits that drive opposite ends of a coil or transformer • Difference between amplifier stages (like push-pull) and detector/discriminator stages (like FM discriminators)

💭 Think About

• Which of these options are primarily used as power amplifier configurations for RF stages, and which are mainly used for signal processing/demodulation? • If you have a link-coupled RF coil or transformer, do you usually want to drive it from one side only, or from two opposite ends with signals that are 180° out of phase? • Look at each choice and ask: does this configuration naturally feed a coupling coil or transformer primary in a balanced way?

✅ Before You Answer

• Identify which choices are power amplifier topologies versus demodulator or phase-splitting circuits • Think about which configuration is classically paired with transformer or link coupling at RF output stages • Eliminate any option that is mainly used for FM detection rather than for driving an RF link-coupled circuit

Which type of amplifier circuit is used in a link coupling R-F?

Push-push

Push-pull

Phase splitter

FM discriminator