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A kind of lc oscillator whose variable capacitance is basically constant in the oscillation cycle

A technology of variable capacitance and oscillation period, which is applied in the field of wireless communication systems and LC oscillators, can solve problems such as the degradation of oscillator phase noise performance, and achieve the effects of improving phase noise performance, improving changes, and eliminating phase noise

Active Publication Date: 2016-01-13
杭州中科微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, even if the oscillator uses the power supply output by the voltage regulator, the control voltage uses a filter to filter out noise, and multiple isolation rings are used to isolate the rebound of noise on the ground of the power supply, there will still be a problem of converting amplitude noise into frequency modulation noise, making the oscillator The phase noise performance is greatly degraded by the

Method used

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  • A kind of lc oscillator whose variable capacitance is basically constant in the oscillation cycle
  • A kind of lc oscillator whose variable capacitance is basically constant in the oscillation cycle
  • A kind of lc oscillator whose variable capacitance is basically constant in the oscillation cycle

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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-Varactor4 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 capacitor AC-Varactor 5 is a differential structure, which is composed of a first two-terminal variable capacitor circuit 51 , a five-terminal variable capacitor circuit 52 and a second two-terminal variable capacitor 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 circuit. ...

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Abstract

The invention discloses an inductor-capacitor (LC) oscillator with basically constant variable capacitance in an oscillation period. The LC oscillator comprises a resonance network consisting of an inductor L and a self-adaptive compensation variable capacitor, a complementary cross-coupling negative resistance amplifier and a bias current source, wherein the variable capacitor is a self-adaptive compensation varactor (AC-Varactor). By dynamically compensating the variable capacitance of the AC-Varactor, variable capacitance variation caused by amplitude variation of output waveform is avoided, and frequency modulation caused by the amplitude variation is avoided, so that phase noise performance deterioration caused by amplitude noise is minimized. The LC oscillator overcomes the defects that in one oscillation period, the variable capacitance can change the oscillation frequency along with the change of voltage at two ends, and the oscillator phase noise performance is decreased by an amplitude modulation to frequency modulation (AM-FM) process; and the LC oscillator with the basically constant variable capacitance in the oscillation period has good phase noise performance and can be widely applied to wireless communication systems.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a voltage-controlled oscillator with low phase noise and high performance, in particular to an LC oscillator with substantially constant variable capacitance in an oscillation cycle, which can be widely used in wireless communication systems. Background technique [0002] The LC oscillator is one of the key components in the wireless communication system. The LC oscillator uses the crystal oscillator frequency with high precision and low phase noise as the reference frequency. Through the feedback and operation of the frequency synthesizer, its operating frequency is a reference of a certain multiple. frequency, and output a local oscillator signal with high frequency stability and high spectral purity. The local oscillator signal is sent to the mixer for mixing. In the receiver, the frequency is down-mixed to low intermediate frequency or directly converted; in the transmitte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/12
Inventor 尹喜珍金玉花马成炎叶甜春殷明
Owner 杭州中科微电子有限公司
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