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1 Use the least sensitive (MHz/V) varactor that will work in the particular application to lessen varactor noise modulation (see also item 7) 2 When an oscillator must function below 40 MHz, use only BJT transistors, as opposed to GaAs FETs, since BJT s will produce extremely low flicker noise 3 Output the highest RF power possible from the oscillator, without damaging the transistor or excessively violating item 11 or 13 below 4 Use only very high unloaded-Q capacitors and inductors in a VCO s resonator circuit 5 Force the VCO oscillator tank resonator s loaded Q as high as possible by using the highest unloaded-Q varactors that are practical for the application 6 Further increase loaded Q of the resonator circuit by using a high L/C ratio for series resonant VCOs, and high C/L ratios for parallel tank VCOs 7 Strongly LC filter the varactor s DC control line in order to minimize noise modulating the varactor, and to minimize any noise coupling from anywhere into this very sensitive control line (Any noise, glitches, or ripple on the VCO s voltage control line will cause the VCO s frequency output to vary, losing frequency stability and creating FM noise) 8 Use only low noise figure (NF) transistors 9 To extract the oscillator s RF energy, place its L or C output tap between the resonator circuit and the input of the transistor (This helps to reduce phase noise due to the resonator s bandpass filtering action) 10 To prevent reflections from entering the oscillator s output, the oscillator must only be permitted to see its own particular design impedance, and must also be fully isolated from any impedance fluctuations within the oscillator s load (This specific effect can be one of the major causes of phase noise) 11 Minimize the oscillator s transistor bias current as much as possible, since this can substantially lower the 1/f (flicker) noise frequency of the active device, as well as optimize the BJT s noise figure 12 Flicker noise, and thus some of the close-in phase noise, can be further mitigated by adding a small value negative feedback resistor of around 10 in series with the emitter lead, which must not be bypassed by a emitter capacitor (However, to decrease the oscillator s other noise outputs irrespective of 1/f noise, a transistor should have a biasing network that does not use any emitter resistor similar to standard LNA design procedures Test the circuit with and without a resistor to see which offers less noise for your particular application) 13 Avoid driving the oscillator s transistor too far into compression 14 Pay particular attention to the oscillator s PCB, since poor general board layout and inferior oscillator isolation from other circuits can cause noise energy to couple into these sensitive circuits 15 Keep the varactor s input VTUNE voltage as high as possible, since the Q of the varactor diode is higher at an increased bias tuning voltage (The Q of a varactor drops at lower bias voltages due to increased resistances of the diode at its maximum capacitance).



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There are numerous kinds of LC oscillators However, both the Hartley and the Colpitts oscillators are quite common, and an understanding of their function will permit a good grasp of most other LC topologies

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