Patent ID: 6466114
Filing Date: 2002-10-15
Classification: H03B,H03J

Abstract:
A resonator with variable resonance frequency, intended for connection to an amplifier in order to form an oscillator with variable oscillation frequency, said resonator comprising:a resonator circuit for determining the resonance frequency of the resonator and thereby the oscillation frequency of the oscillator, said resonator circuit comprising at least a first inductance (L), at least a first variable capacitance (Cj), and means for varying the first capacitance; connection means for connecting the resonator to said amplifier, said connection means including a capacitance (Ck); means for varying the capacitance (Ck) of the connection means in proportion to the variation of the first capacitance (Cj) of the resonator circuit; wherein the means for varying the capacitance (Ck) of the connection means is arranged so that an essentially constant relationship (Ck/Cj) is maintained between the capacitance (Ck) of the connection means and the first capacitance (Cj) of the resonator across all resonance frequencies; and wherein voltage via a first terminal is used to vary the capacitance (Ck) of the connection means, and voltage via a second terminal is used to vary the first respective (Cj) of the resonator circuit, so that different voltages can be used to vary the respective capacitances (Ck) and (Cj).