A Quadrature Ring Oscillator Based on Resistor Enhanced Feedforward

A ring oscillator, enhanced technology, applied in the field of phase-locked loop, can solve the problem that the oscillator does not meet the Barkhausen criterion, etc., to achieve the effect of reducing intrinsic jitter, reducing power consumption, and increasing oscillation frequency

Active Publication Date: 2022-04-15
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the DC phase shift of the four-stage single-ended ring oscillator is 0°, and the frequency phase shift of each delay unit is 90° only when the frequency is infinite, so the oscillator does not satisfy the Barkhausen criterion

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  • A Quadrature Ring Oscillator Based on Resistor Enhanced Feedforward
  • A Quadrature Ring Oscillator Based on Resistor Enhanced Feedforward
  • A Quadrature Ring Oscillator Based on Resistor Enhanced Feedforward

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specific Embodiment

[0027] figure 1 It is a quadrature ring oscillator based on resistance-enhanced feedforward, which satisfies the Barkhausen criterion, can output four quadrature signals, and directly drives the post-stage mixer, saving the power consumption of the frequency divider. Each feed-forward delay unit consists of a direct branch and a resistance-enhanced feedforward branch. Resistance enhancement is achieved by adding a resistor to the inverter. The gate voltage of the PMOS transistor drops rapidly due to the voltage drop across the resistor, making the PMOS transistor quickly turn on and then enter the linear region, increasing the charging current and reducing The rise time, the oscillation period is reduced, and the oscillation frequency is increased.

[0028] figure 2 For the oscillation waveform of the feedforward branch without resistance and with such resistance, the simulation shows that the oscillation frequency increases from 1.35GHz to 2.22GHz, and the oscillation peri...

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Abstract

The invention discloses a quadrature ring oscillator based on resistance-enhanced feedforward, which is composed of four-stage single-ended delay units, each delay unit has a direct branch and a feedforward branch, and the direct branch is composed of an open-drain NMOS transistor , the feedforward branch is composed of resistance-enhanced inverters. The invention deduces the frequency expression and start-up condition of the oscillator, and the oscillation frequency can be changed by adjusting the transconductance ratio of the two branches. According to the structure of the present invention, the resistance-enhanced feedforward branch can increase the strength of the feedforward to accelerate the level reversal rate of the output node, and further increase the oscillation frequency; the output four-way orthogonal signal can directly drive the post-stage mixer, reducing the system power consumption; the present invention is suitable for ring oscillators in low voltage and low power consumption applications.

Description

technical field [0001] The invention belongs to the technical field of phase-locked loops, in particular to a quadrature ring oscillator based on resistance-enhanced feedforward. Background technique [0002] The oscillator is an important part of the phase-locked loop, which determines the carrier frequency in the radio frequency transceiver. In order to improve the service life of the radio frequency transceiver, reducing power consumption is a necessary method. At present, the method of reducing the power supply voltage is the focus of attention and research hotspot to solve the problem of power consumption. With the reduction of power supply voltage, the reduction of transistor intrinsic gain and characteristic frequency makes the performance of traditional circuit structure worse, so the circuit with conventional structure is no longer applicable, and improving the circuit structure is the only way. [0003] In order to meet the requirements of low power consumption, t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
CPCH03L7/0995
Inventor 李红张蓉吴建辉陈超
Owner SOUTHEAST UNIV
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