| 摘要 |
A circuit arrangement for production of radio-frequency output signals formed by a broadband frequency ramp is described and illustrated, having a reference oscillator (1), a phase detector (2), a loop filter (3), a VC oscillator (4) for production of the output signals, a frequency divider (5), a step-down mixer (7) and a local oscillator (8) for production of a local oscillator signal, wherein the reference oscillator (1), the phase detector (2), the loop filter (3), the VC oscillator (4), the frequency divider (5) and the step-down mixer (7) belong to a phase locked loop, the frequency divider (5) and the step-down mixer (7) are located in the feedback path of the phase locked loop, the step-down mixer (7) mixes the output signals and the local oscillator signal, and the frequency of the output signal can be adjusted by variation of the division ratio of the frequency divider (5). According to the invention, the characteristic of the output signal is improved with the aid of the adjustable frequency of the local oscillator signal. |
