VCO device generating balanced duty ratio signals

Abstract

The invention relates to a VCO device generating balanced duty ratio signals, which comprises a device body. the device body is internally provided with at least two identical annular oscillation devices; each annular oscillation device is provided with an independent signal output port; the annular oscillation device is formed by a four-stage differential delay assembly; two annular oscillation devices are in end-to-end connection; one stage of each annular oscillation device adopts a non-reverse connection method; PMOS devices are connected onto the annular oscillation devices; the PMOS devices are connected in a crossed coupling mode; gate ends of the PMOS devices are grounded; the PMOS devices are commonly connected with the input end of a differential amplifying device; and the output end of the differential amplifying device is connected with the input end of a reversed-phase device. Thus, the problem that delay exists between two output signals of the traditional annular oscillation device can be solved, two paths of output signals are synchronized in a crossed coupling method, and finally the output signal has a balanced duty ratio.

Description

technical field [0001] The invention relates to a VCO device, in particular to a VCO device for generating balanced duty ratio signals. Background technique [0002] With the continuous development and progress of the society, the amount of information exchange is increasing day by day, and the construction standards of the information highway are also constantly improving, and more design standards such as large capacity, fast transmission speed, long transmission distance, energy saving, and anti-interference are also constantly improving. . In this situation, the research and development of integrated circuit components in communication systems is becoming increasingly intense. [0003] The phase-locked loop (PLL) is an indispensable key circuit in the communication field, and the voltage-controlled oscillator (VCO) is a very critical part of the PLL. In recent years, with the continuous improvement of communication standards, the system has put forward higher requireme...

AI Technical Summary

Problems solved by technology

[0005] The traditional ring oscillation device consists of a loop, which is composed of multiple delay units. It adopts a multi-stage differential amplifier ring structure. The output signal frequency is equal and the phase is opposite. However, due to the delay between the two signals, the phase cannot be separated by 180°. Phase difference alignment, resulting in the final output signal duty cycle can not reach 1:1

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