Electronics from the Ground Up by Ronald Quan

Author:Ronald Quan
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2015-02-07T05:00:00+00:00

Radio-Frequency (RF) Oscillators

For both radio transmitters and receivers, oscillators play an important role. They provide signals that are stable in frequency for transmitting and variable frequencies for tuning across the band. Although these days many of the “analog” oscillator signals are replaced with frequency synthesizer chips such as the Analog Devices AD9851, RF oscillators are still being used in low-power applications and for many do-it-yourself (DIY) hobbyist radio circuits. We will touch on some basic RF oscillator circuits here, and other types will be addressed in Chapters 10 and 11.

We will start with a Colpitts oscillator, a zero-degrees phase-shift oscillator, which is often used in fixed- and variable-frequency oscillators. Let’s first take a look at a block diagram of a basic zero-phase-shift oscillator (see Figure 9-17).

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