High frequency oscillator inhibiting parasitic oscillation

Abstract

The invention discloses a high frequency oscillator inhibiting parasitic oscillations; the high frequency oscillator comprises a DC power supply circuit, an oscillation generation circuit and a parasitic oscillation inhibition circuit; the DC power supply circuit comprises a DC voltage source V1, a high frequency choke coil L2, a first filter capacitor C11, a second filter capacitor C22, a first bias resistor R1, a second bias resistor R2 and a first bias capacitor C0; the oscillation generation circuit comprises a first transistor Q1, a first resonant capacitor C1, a second resonant capacitor C2, a third resonant capacitor C3, a fourth adjustable resonant capacitor C4, a first feedback resistor R3 and a first resonance inductor L1; the parasitic oscillation inhibition circuit comprises a first coupling capacitor C5, a second transistor Q2, a first current-limiting resistor R4, a first frequency selection capacitor C6, a second frequency selection capacitor C7, and a first frequency selection inductor L3; the high frequency oscillator can stably form high frequency sine waves, and can effectively inhibit parasitic oscillations.

Description

Technical field [0001] The invention relates to the field of electronic circuits, mainly to a high-frequency oscillation circuit, and in particular to a high-frequency oscillator that suppresses parasitic oscillation. Background technique [0002] Oscillation circuit is a signal generating circuit that can generate sine waves, sawtooth waves and square waves with specific frequencies. One of the most used is an oscillator that generates a sine wave. Sine wave oscillators are widely used in many fields such as measurement, automatic control, radio communication and remote control. In the field of radio communication, the sine wave generated by the sine wave oscillator can be used as a transmitter carrier source, a frequency conversion local oscillator, and a receiver mixing local oscillator. The most important one is as a carrier of useful signals, which modulates and transforms the signal for long-distance transmission. As the signal frequency continues to increase, the requir...

AI Technical Summary

Problems solved by technology

Parasitic oscillations often appear in high-frequency oscillation circuits, but because the causes of parasitic oscillations are complex and diverse, it is difficult to directly eliminate parasitic oscillations in oscillation circuits

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