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

A voltage-controlled oscillator, digital-analog hybrid technology, applied in the field of phase-locked loops

Active Publication Date: 2006-08-09
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0019] figure 1 It is a block diagram of a digital-analog mixed signal loop voltage-controlled oscillator with process error compensation proposed by the present invention. It has analog signal input terminal Ca; digital signal input terminal C0', C0, C1, C2, ... Cn; process error compensation control terminal P1, ... Pm. In principle, m can be any integer greater than or equal to 1, but in practical applications Among them, m=1 or m=2 is generally taken, that is, there are only one or two process error compensation control terminals; two anti-phase signal frequency output terminals Fout and Fout. The principle of digital preset or digital rough adjustment is: input a group of digital signals Cn…C2 C1 C0C0’, through the internal control circuit, the voltage-controlled oscillator immediately outputs a signal frequency that is very close to the expected signal frequency. However, due to the production process error, the VCO output signal frequency may have a large deviation. At...

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Abstract

The disclosed oscillator consists of two parts: delay cells with technique error compensation connected in ring, and control circuit for digital-analog composite signal (scheme 1); or common delay cells connected in ring, and control circuit for digital-analog composite signal with technique error compensation (scheme 2). Based on common difference inverter, the scheme 1 adds one or more MOS tubes on load tube to constitute the delay cells in order to compensate technique error. In scheme 2, delay cells are common; and control circuit for digital-analog composite signal possesses constant current source controlled by one or more ends of technique error compensation.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/26H03B1/04H03L7/099
Inventor 邝小飞吴南健
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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