High-frequency voltage-controlled oscillator system
A technology of voltage-controlled oscillators and oscillators, applied in automatic power control, electrical components, etc., can solve the problems of high power consumption, high complexity of high-frequency phase-locked loops, etc., achieve reduced phase noise and frequency deviation, and good frequency stability , The effect of low process sensitivity
Active Publication Date: 2021-04-13
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology
[0007] In order to solve the above technical problems, the present invention provides a high-frequency voltage-controlled oscillator system, which avoids the problems of high complexity and high power consumption caused by designing a high-frequency phase-locked loop on the basis of stable output frequency and phase.
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[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be used for both the fixing function and the circuit connection function.
[0027] Because the independent ring voltage controlled oscillator is easily aff...
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The invention discloses a high-frequency voltage-controlled oscillator system, which comprises a low-frequency phase-locked loop and an out-of-loop voltage-controlled oscillator. The low-frequency phase-locked loop comprises an in-loop voltage-controlled oscillator, the out-of-loop voltage-controlled oscillator and the in-loop voltage-controlled oscillator are both controlled by control voltage locked by the low-frequency phase-locked loop, the out-of-loop voltage-controlled oscillator comprises M time delay units, the M time delay units are connected in an input and output mode after being cascaded, the in-loop voltage-controlled oscillator comprises N time delay units, the N time delay units are connected in an input and output mode after being cascaded, and M is smaller than N. According to the high-frequency voltage-controlled oscillator system provided by the invention, on the basis of outputting stable output frequency and phase, the problems of high complexity, high power consumption and the like caused by designing a high-frequency phase-locked loop are avoided.
Description
technical field [0001] The invention relates to the field of integrated circuit design, in particular to a high-frequency voltage-controlled oscillator system. Background technique [0002] As the most critical carrier generation circuit in the communication circuit of the radio frequency transceiver, the oscillator's type selection and performance will directly affect the normal operation of the radio frequency transmitter and receiver. There are three common oscillators: [0003] 1) Crystal oscillator. The frequency output of the crystal oscillator has high precision and good stability, and is usually used in the frequency generator in the communication system to provide a stable external input reference clock frequency for the communication system. However, at present, the crystal oscillator is not compatible with the CMOS process, and the cost is relatively high. [0004] 2) LC oscillator. LC oscillators use inductor-capacitor cross-coupling to form an oscillation lo...
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Login to View More IPC IPC(8): H03L7/099
CPCH03L7/099
Inventor 张盛沈文丽郑继晨
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV