Receiver tuning system
AssigneeKoninklijke Philips Electronics N.V.
InventorsWolfdietrich G. Kasperkovitz, Cicero S. Vaucher
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Abstract
In a receiver, a frequency-synthesis circuit (SYNTH) generates a stepped-frequency signal (Ssf) having a frequency which can be varied in steps. A synchronization circuit (LOOP) synchronizes a tuning oscillator (LO) with the stepped-frequency signal (Ssf). It provides an integer frequency-relationship between the stepped-frequency signal (Ssf) and the tuning oscillator (LO). That is, if the stepped-frequency signal (Ssf) has a frequency Fsf, the tuning oscillator (LO) will operate at a frequency Flo=N·Fsf, N being an integer or an integer fraction.
Claims6
A receiver comprising a tuning system for tuning the receiver, the tuning system comprising:
- a frequency-synthesis circuit for generating a stepped-frequency signal having a frequency varying in steps with a step size;
- and
- a synchronization circuit for synchronizing a tuning oscillator to the stepped-frequency signal to form a tuning frequency, said synchronization circuit comprising means for providing an adjustable integer frequency relationship between the stepped-frequency signal and the tuning frequency, characterized in that the frequency-synthesis circuit comprises means for varying the step size of the stepped-frequency signal in dependence on the adjustable integer frequency relationship such that the synchronization circuit forms the tuning frequency having substantially uniform tuning steps.
A tuning system comprising:
- a frequency-synthesis loop for generating a stepped-frequency signal having a frequency varying in steps with a step size;
- and
- a synchronization circuit for synchronizing a tuning oscillator to the stepped-frequency signal to form a tuning frequency, said synchronization circuit comprising means for providing an adjustable integer frequency relationship between the stepped-frequency signal and the tuning frequency, characterized in that the frequency-synthesis circuit comprises means for varying the step size of the stepped-frequency signal in dependence on the adjustable integer frequency relationship such that the synchronization circuit forms the tuning frequency having substantially uniform tuning steps.
A method of tuning comprising the steps:
- generating a stepped-frequency signal having a frequency varying in steps with a step size;
- synchronizing a tuning oscillator to the stepped-frequency signal to form a tuning frequency;
- and
- providing an adjustable integer frequency relationship between the stepped-frequency signal and the tuning frequency, characterized in that the method of tuning further comprises the step:
- varying the step size of the stepped-frequency signal in dependence on the adjustable integer frequency relationship to form the tuning frequency having substantially uniform tuning steps.
Dependencies are inferred from the claim text.