TUNABLE CRYSTAL OSCILLATOR WITH HARMONIC OUTPUT

摘要

In an oscillator arrangement (VCXO), an oscillation loop (OSL) oscillates at, approximately, the fundamental frequency of a crystal (XTL) included therein. The output signal (Sosc) of the oscillator arrangement (VCXO) is a harmonic extracted from the oscillation loop (OSL). To vary the frequency of the output signal (Sosc), tuning means (VAR) are included in the oscillation loop (OSL). A stage (FIL) in the oscillator arrangement (VCXO) prevents harmonic feedback into the oscillation loop (OSL). Such an oscillator arrangement (VCXO) can be tuned over a relatively large frequency range and has a monotonous tuning characteristic.