Patent ID: 6630869
Filing Date: 2003-10-07
Classification: H03B,H05K

Abstract:
A broadband, very low phase noise, temperature stable, sync loss free voltage controlled oscillator circuit (â€œVCO circuitâ€ ) comprising:(a) a first printed wiring board (â€œPWBâ€ ) comprising a synthesizer circuit; (b) a second PWB having first and second surfaces and at least one unplated blind via open to the second surface and penetrating substantially through the second PWB towards the first surface to allow for heat transfer between the surfaces, comprising: (i) a Clapp oscillator on said first surface comprising: (1) a printed microstrip as a high Q inductive element; (2) plural very high Q porcelain capacitors; and (3) a reversed biased varactor diode for tuning the oscillator; (ii) a buffer amplifier circuit on said first surface optimized for the fundamental frequency range of the oscillator; and (iii) a positive temperature coefficient resistor on said second surface operatively connected to a DC voltage source not on said second surface; (c) plural supports, each capable of carrying an electric current, connected to the second PWB and extending towards the first PWB to thereby space apart the PWBs; and (d) an insulated enclosure around said second PWB to minimize heat loss from said second PWB thereby allowing the VCO circuit to function in a broadband, very low phase noise, temperature stable, sync loss free manner.