公开(公告)号：US11245359B2

公开(公告)日：2022-02-08

申请号：US17138916

申请日：2020-12-31

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Chao Li ,  Quan Xue ,  Liang Wu ,  Shaowei Liao

IPC: H03B5/12 ,  H03B27/00

Abstract: A quadrature voltage-controlled oscillator circuit with phase shift includes two voltage-controlled oscillators with the same structure, wherein the two voltage-controlled oscillators are connected to each other through input and output ports, and the two voltage-controlled oscillators respectively include a cross-coupled oscillating circuit, an injection locking circuit, a resonant circuit and a voltage-controlled current source circuit which are electrically connected to each other; and signals are injected through the injection locking circuit and coupled with the oscillating circuit, so as to output a quadrature signal. An oscillator is enabled to operate stably in one mode by means of a simple circuit structure, and a good phase shift can be provided for the resonant circuit in a lower frequency band; and meanwhile, a tuning range of the oscillator is improved without increasing phase noise.

公开(公告)号：US11303246B1

公开(公告)日：2022-04-12

申请号：US17354620

申请日：2021-06-22

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Quan Xue ,  Chao Li

IPC: H03B5/12 ,  H04B1/40 ,  H03B5/30

Abstract: The present disclosure provides a voltage controlled oscillation device and a wireless transceiver. The voltage controlled oscillation device includes a resonator, an oscillation core circuit, a switch circuit and a control device. The oscillation core circuit is configured to provide signals of different phases to the resonator. The resonator is configured to generate a plurality of different resonance frequencies. The control device is configured to control the connection/disconnection among ends of the resonator through controlling the switch circuit to be on/off, so that the resonator retains two resonance frequencies from the plurality of different resonance frequencies. The control device is further configured to change the retained two resonance frequencies by controlling the switch circuit to be turn on/off. The resonator is further configured to process two resonance frequencies under action of oscillation core circuit, and output a fundamental signal of one resonance frequency.

公开(公告)号：US11329605B1

公开(公告)日：2022-05-10

申请号：US17354526

申请日：2021-06-22

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Quan Xue ,  Chao Li

IPC: H03B5/12 ,  H04B1/40

Abstract: The present disclosure relates to a multi-mode voltage controlled oscillation device and a wireless transceiver. The multi-mode voltage controlled oscillation device includes an oscillation core circuit and at least four resonance circuits. Each of the resonance circuits includes two input ends and one power supply end. The two input ends of each of the resonance circuits are respectively connected to an output end of the oscillation core circuit, and the power supply end of each of the resonance circuits is configured to be connected to a power supply. The multi-mode voltage controlled oscillation device provided by the present disclosure is formed by connecting the oscillation core circuit with each resonance circuit and connecting the resonance circuits with each other, with a simple structure, a tight connection, and a small area.