A Hybrid Class b/c Low Noise Voltage Controlled Oscillator
A voltage-controlled oscillator and low-noise technology, applied in power oscillators, electrical components, etc., can solve problems such as poor oscillator noise performance and channel signal interference, and achieve the effect of reducing noise contribution and mean square value
Active Publication Date: 2021-08-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
As the operating frequency of the circuit becomes higher and the size of the device becomes smaller and smaller, the noise performance of the corresponding oscillator becomes worse and worse.
In a transceiver system, when there is phase noise in the oscillator output signal, the frequency spectrum will appear in a crony shape, which is no longer an ideal impulse function, and the interference signal will be down-converted to a low frequency band along with the signal, affecting the desired channel signal interfere
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Embodiment Construction
[0081] This embodiment provides a hybrid B / C type low-noise voltage-controlled oscillator, which solves the problem in the prior art that the relatively large phase noise in the output signal of the oscillator will seriously interfere with the signal received by the transceiver and affect the overall performance of the circuit. .
[0082] The technical solution in this embodiment is to solve the above problems, and the general idea is as follows:
[0083] like figure 1 As shown, a hybrid Class B / C low-noise voltage-controlled oscillator, including:
[0084] The self-switching current source circuit, in the initial operation, the current source in the self-switching current source circuit is in the open state, and provides an oscillation current for the voltage-controlled oscillator;
[0085] Tail current shaping voltage-controlled oscillator circuit, the tail current source current of this circuit increases with the oscillation of the circuit, its current is proportionally m...
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The invention discloses a hybrid B / C type low-noise voltage-controlled oscillator, comprising: a self-switching current source circuit, in the initial operation, the current source in the self-switching current source circuit is in an open state, and is a voltage-controlled oscillator Provide an oscillation current; a tail current shaping voltage-controlled oscillator circuit, the tail current source current of this circuit increases with the circuit oscillation, and its current is proportionally mirrored to the self-switching current source circuit, and finally turns off the oscillation current; the said The tail current shaping voltage-controlled oscillator circuit includes a tail current shaping circuit, which is used to provide an approximate pulse tail current, and feeds back the oscillation signal generated by the resonant circuit to the tail current source to synchronize the tail current waveform with the output voltage waveform. The invention feeds back the oscillating signal generated by the resonant circuit to the tail current source to synchronize the tail current waveform with the output voltage waveform, provides a pulse-like tail current, and injects more current to reduce phase noise when the sensitivity to noise current is low.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a hybrid B / C type low-noise voltage-controlled oscillator. Background technique [0002] The voltage-controlled oscillator is the main component of the radio frequency transceiver, its performance directly affects the accuracy of signal transmission and reception, and the phase noise is the key parameter that determines the performance of the voltage-controlled oscillator. As the operating frequency of the circuit becomes higher and the size of the device becomes smaller and smaller, the noise performance of the corresponding oscillator becomes worse and worse. In a transceiver system, when there is phase noise in the oscillator output signal, the frequency spectrum will appear in a crony shape, which is no longer an ideal impulse function, and the interference signal will be down-converted to a low frequency band along with the signal, affecting the desired channel signal int...
Claims
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IPC IPC(8): H03B5/04H03B5/24
CPCH03B5/04H03B5/24
Inventor 姚若河刘爽王立姣
Owner SOUTH CHINA UNIV OF TECH