Digital-to-analogue mixed signal loop pressure-control oscillator with technology error compensation

Abstract

The invention relates to a digital-analog mixed-signal loop voltage-controlled oscillator with process error compensation. It consists of two parts, a plurality of ordinary delay units connected in a ring and a digital-analog mixed-signal control circuit with process error compensation. In the voltage-controlled oscillator composed of several delay units with process error compensation and digital-analog mixed signal control circuit connected in a ring, the delay unit is based on a common differential inverter, and its load tube Connect one or more MOS tubes in parallel for process error compensation. In a voltage-controlled oscillator composed of multiple ordinary delay units connected in a ring and a digital-analog mixed-signal control circuit with process error compensation, the delay unit is an ordinary differential inverter, and the digital-analog mixed control circuit has One or more constant current sources controlled by process error compensation end.

Description

technical field [0001] The invention relates to the technical field of phase-locked loops used in communication and information processing systems, in particular to a digital-analog mixed signal loop voltage-controlled oscillator with process error compensation. Background technique [0002] The voltage-controlled oscillator (VCO) is the most important component of the phase-locked loop. In order to obtain high-frequency, high-precision output signal frequency, the form of an LC voltage-controlled oscillator or a loop voltage-controlled oscillator is generally used. Loop voltage-controlled oscillators have been widely used in communication and digital circuits due to their advantages of low power consumption, wide output frequency range, and small chip area. [0003] The loop voltage controlled oscillator is composed of N delay units connected in a ring, and the delay units can be single-ended or differential. For a single-ended delay unit, N can only be an odd number; for ...

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Problems solved by technology

[0005] For VCOs with digital coarse tuning or digital presets, this problem may become more serious, because this kind of VCO also requires a high linear relationship between the digital control word and the output signal frequency, and the process error is very important for this kind of VCO. The output frequency range and frequency linearity of the VCO have a great influence, so we need measures to compensate the process error to overcome the above shortcomings

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