Inductor-capacitor (LC) oscillator with basically constant variable capacitance in oscillation period
A technology of variable capacitance and oscillation period, applied in power oscillators, electrical components, etc., can solve the problem of oscillator phase noise performance degradation, and achieve the effect of improving phase noise performance, reducing power consumption, and improving changes.
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Embodiment 1
[0053] Figure 4 An electrical schematic diagram of an adaptively compensated variable capacitance AC-Varactor of Embodiment 1 of the LC oscillator of the present invention is given, as Figure 4 As shown: the adaptive compensation variable capacitance AC-Varactor 4 is a differential structure, which is composed of a first two-terminal variable capacitance circuit 41 , a four-terminal variable capacitance circuit 42 and a second two-terminal variable capacitance circuit 43 . The first two-terminal variable capacitance circuit 41 is connected in series between an output arm of the four-terminal variable capacitance circuit 42 and a differential output VP end of the LC tuning circuit, and the second two-terminal variable capacitance circuit 43 is connected in series between the four-terminal variable capacitance circuit. Between the other output arm of the variable capacitance circuit 42 and a differential output VN terminal of the LC tuning circuit. The variable capacitor C of...
Embodiment 2
[0057] Figure 5 A schematic circuit diagram of another configuration of the self-adaptively compensated variable capacitor AC-Varactor of Embodiment 2 of the LC oscillator of the present invention is given. Such as Figure 5 As shown, the differential structure adaptive compensation variable capacitance AC-Varactor 5 is a differential structure, which is composed of a first two-terminal variable capacitance circuit 51 , a five-terminal variable capacitance circuit 52 and a second two-terminal variable capacitance circuit 53 . The first two-terminal variable capacitance circuit 51 is connected in series between an output arm of the five-terminal variable capacitance circuit 52 and a differential output VP terminal of the LC tuning circuit. The second two-terminal variable capacitance circuit 53 is connected to the other output arm of the five-terminal variable capacitance circuit 52 in parallel, and is directly connected to a differential output VN terminal of the LC tuning c...
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