| 摘要 |
The invention is based on the object of specifying a simple and universal circuit which manages without division of the resonant-circuit capacitance or tapping of the resonant-circuit inductance even at low frequencies. The object is achieved by the fact that a resonant circuit consisting of an adjustable capacitor (C1) and an inductance (L1) is connected via a capacitor (C2) and a diode clamping circuit consisting of at least one Schottky diode (D1) and at least one resistor (R1) to the input (gate) of a junction field effect transistor (JFET) operating in common-drain circuit and having a high transconductance, that a positive operating voltage is connected in parallel with an RF blocking capacitor (C5) at the drain electrode of the JFET and that the output of the JFET is connected via a resistor (R2) to a choke (L2) and a capacitor (C3), connected in parallel therewith, and a resistor (RL). A preferred field of application is for use in portable devices of communications technology. The drawing shows the circuit diagram of the oscillator. <IMAGE> |
