Systems and methods for providing an adjustable reference...

Details Systems and methods for providing an adjustable reference... Systems and methods for providing an adjustable reference...

2006-04-25

2006-04-25

Gesesse, Tilahun (Department: 2684)

Telecommunications

Receiver or analog modulated signal frequency converter

Panoramic display

C455S076000, C455S260000, C331S03600C

Reexamination Certificate

active

07035607

ABSTRACT:
Frequency modification circuitry may be employed as part of a crystal oscillator circuit to generate a reference signal with adjustable frequency. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally controlled crystal oscillator (“DCXO”) circuitry and a crystal. The frequency modification circuitry may adjust the frequency of the reference signal in response to one or more frequency control signals. In one example, the frequency modification circuitry may include variable capacitors such as one or more continuously variable and/or discretely variable capacitors for providing coarse and/or fine adjustment of the reference signal frequency.

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Stephen Jantzi et al., “Quadrature Bandpass ΔΣ Modulation for Digita

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