Abstract: A voltage-controlled oscillator device with an LC-resonant circuit, in particular for implementing integrated voltage-controlled oscillators for the lower GHz range, is disclosed. The device achieves continuous frequency tunability in a wide range in particular with a low level of phase noise and phase jitter. In the voltage-controlled oscillator, a second inductor can be periodically switched in parallel and/or in series with at least one first inductor of the LC-resonant circuit by way of a switching means actuated with the oscillator frequency. A control input of the switching means is connected to a variable dc voltage. In that respect the relationship of the duration of the conducting state and the duration of the non-conducting state of the switching means is variable within an oscillation period of the oscillator in dependence on the value of the control voltage.

Abstract: A ring oscillator consisting of a plurality of series connected amplifier stages alternatingly energized by first and second voltages negatively correlated to each other. The output of the final amplifier stage is inverted and connected to the input of the first stage. The second voltage is derived from the first voltage by way of an inverting amplifier which is dimensioned to render the total sensitivity K=df/dVDD zero.