A Low Power and High Resolution Digital Phase Generator

Abstract

The invention discloses a digital phase generator with low power consumption and high resolution, which includes a signal injection circuit and a four-stage ring oscillator; the four-stage ring oscillator includes a first delay unit, a second delay unit, a third delay unit and The fourth delay unit, the signal injection circuit includes a first NMOS transistor and a second NMOS transistor, the gate of the first NMOS transistor is connected to the inverting terminal of the input signal, and the source is grounded; the gate of the second NMOS transistor is connected to the non-inverting terminal of the input signal , the source is grounded; the drain of the first NMOS transistor is connected to the positive output terminal of the first delay unit, and the drain of the second NMOS transistor is connected to the negative output terminal of the first delay unit. This kind of structure is realized based on the injection locking technology, only needs to adjust the free oscillator frequency of the ring oscillator to realize the high-resolution phase interpolation function, and has very low power consumption.

Description

technical field [0001] The invention belongs to the technical field of digital modulation, in particular to a digital phase generator with low power consumption and high resolution. Background technique [0002] A digital phase generator, also called a digital time converter or a digital delay line, generates a clock signal with different delays or different phases by changing the digital control signal. Digital phase generators are widely used in clock recovery circuits, phase-locked loop feedback loops, direct frequency synthesizers, and polar modulation. The working frequency of the digital phase generator in the phase-locked loop is close to the reference frequency, but in the polar modulation system and the clock recovery circuit, the digital phase generator needs to work at a frequency close to gigahertz. [0003] The traditional digital phase generator based on the inverter delay chain has good linearity, but its gain is seriously affected by the process and the chan...

AI Technical Summary

Problems solved by technology

[0003] The traditional digital phase generator based on the inverter delay chain has good linearity, but its gain is seriously affected by the process and the change of power supply voltage, and the power consumption is very large, which greatly limits its application

The phase generator based on phase interpolation has a fixed gain, but its linearity is poor, and the power consumption cannot be reduced to a very low level at high frequencies.

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