Oscillator circuit

Abstract

Abstract In an oscillator circuit having an output frequency which can be adjusted via a phase control loop, a frequency divider circuit is present in the phase control loop, the divider ratio of which is variable. To refine the possibilities for adjusting the output frequency (f0), the frequency (fref) of a reference oscillator (RO) connected to the phase control loop (PR) can be slightly pulled via a pulling input (6). The fine adjustment signal ( DELTA f) at the pulling input (6) is obtained with consideration of the adjustment of the divider ratio (n) of the frequency divider circuit (FT1). The invention is particularly applicable to frequency synthesizers. <IMAGE>

Inventors

• 👤 Helmut Ing.Grad. Fischer

Bibliographic Details