Terminology » RF Basics » RF Amplifier vs. RF Oscillator: Key Differences Explained

RF Amplifier vs. RF Oscillator: Key Differences Explained

rf amplifier rf oscillator rf signal oscillator amplifier

This article clarifies the differences between an RF amplifier and an RF oscillator, comparing them based on various essential parameters.

RF Amplifier

An RF amplifier is a device designed to amplify RF signals to a desired power level. Essentially, it boosts the power of the signal, ensuring it meets the requirements of the link budget or functions correctly with other devices in the system.

rf power amplifier

Example: A 5W Solid State Power Amplifier (SSPA) used in a VSAT system, built using discrete MMIC amplifier ICs.

RF amplifiers are commonly used:

To provide gain to a signal before transmitting it through an antenna.
To boost the signal after reception, maintaining a good Signal-to-Noise Ratio (SNR).

RF Oscillator

An RF oscillator is a device that generates a stable RF signal. It’s used to create the RF carrier signal needed in modems (modulator-demodulators) or to generate the Local Oscillator (LO) signal required in transceivers.

wein bridge oscillator

Example: A Wien bridge oscillator built using an op-amp, resistors, and capacitors.

The frequency equation for a Wien bridge oscillator is:

f = 1 / (2 * π * sqrt(R3 * R4 * C1 * C2))

Oscillators are usually built using either Inductor (L) and Capacitor (C) components or Resistor (R) and Capacitor (C) components. Common types of oscillators include: