Circuit arrangement for generation of radio frequency output signals which form a broadband frequency ramp

摘要

A circuit arrangement for generation of radio frequency output signals which form a broadband frequency ramp, with a reference oscillator, a phase detector, a loop filter, a VC oscillator for generating the output signals, a frequency divider, a step-down mixer and a local oscillator for generating a local oscillator signal. The reference oscillator, the phase detector, the loop filter, the VC oscillator, the frequency divider and the step-down mixer belong to a phase-locking loop. The frequency divider and the step-down mixer are in the feedback path of the phase-locking loop. The step-down mixer mixes the output signals and the local oscillator signal. The frequency of the output signal is adjustable by varying the division ratio of the frequency divider. Characteristics of the output signal are improved using the adjustable frequency of the local oscillator signal.

主权项

1. A circuit arrangement for generation of radio frequency output signals which form a broadband frequency ramp, the circuit arrangement comprising:
a reference oscillator; a phase detector; a voltage-controlled (VC) oscillator that generates an output signal; a frequency divider; a step-down mixer; and a local oscillator that generates a local oscillator signal, wherein: the reference oscillator, the phase detector, the VC oscillator, the frequency divider and the step-down mixer are part of a phase-locking loop; the frequency divider and the step-down mixer are in a feedback path of the phase-locking loop; the step-down mixer mixes the output signal and the local oscillator signal; the frequency of the output signal is adjustable by variation of a division ratio of the frequency divider; and the step-down mixer is an inverted position mixer that is located in the feedback path of the phase-looking loop in a manner that compensates variations of the division ratio in the frequency divider with the tuning steepness of the VC oscillator.