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Lowcost Voltage Controled Oscillator?

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carpenter

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Advise a cheap VCO Voltace controled oscilator any as Mini circuit ROP-xxxx , but significantly cheaper for example
for frequency 900-1000MHz
for frequency 1500-1700MHz
for frequency 1750-1900MHz
for frequency 2200-2500MHz
 

Do you prefer a sine wave generator?
For the GHz range I suppose you need the fewest components, and fastest components.

The twin-T is feasible. It has only one transistor. Its frequency can be made to vary with the supply voltage.

VCO twin-T sine 25-30 MHz freq varying supply V.png

As supply varies from 2 to 8V, frequency goes from 25 to 30 MHz.
 

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