Patent ID: 7990227

Claim:
An apparatus for providing Phased-Locked Loop (PLL) synthesis, comprising: Ea phase detector, at least one switchable filter, an oscillator controlled by a control voltage (u PLL ) and a divider, wherein the controlled oscillator comprises first and second voltage-controlled diodes, one inductance and two fixed-specification capacitors and has two inputs, wherein the control voltage (u PLL ) is coupled to a first input, and a selection voltage (u SET ) for rough frequency adjustment is smoothed with an R-C low-pass filter and coupled to a second input, wherein both voltages establish the frequency of the oscillator, a first resistor is connected to the first diode, a second resistor is connected to the second diode, and the inductance forms a parallel circuit with the diodes, and a capacitor, including two condensers, of the low-pass filter is adjustable and connects a resistor and a connection of a switching element to earth, wherein the switching element bridges the resistor in order to pre-charge the capacitor.