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High-precision high-linearity digital-analoge mixed signal loop pressure control oscillator

A technology of voltage-controlled oscillator and digital-analog mixing, which is applied in the field of phase-locked loops, and can solve problems such as speeding up the locking speed, digital coarse adjustment or digital preset accuracy is not high, and reduces

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

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Problems solved by technology

[0004] A disadvantage of the above-mentioned common loop voltage-controlled oscillator is that the gain Kv of the VCO is too high, and a small external voltage change will cause a large output signal frequency change. In the application as a phase-locked loop, it will cause fluctuations in the power supply, Substrate noise, and the charge pump and phase detector noise immunity from the loop filter are poor, which is very unfavorable for applications in wireless communications where phase noise requirements are extremely low
[0005] In order to reduce Kv and speed up the locking speed of the phase-locked loop, many VCOs with digital presets or digital coarse adjustments have been proposed, but they all have the disadvantages of low digital coarse adjustments or digital presets, which will greatly reduce The effect of speeding up the lock

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  • High-precision high-linearity digital-analoge mixed signal loop pressure control oscillator

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Embodiment Construction

[0022] figure 1 It is a block diagram of a high-precision and high-linearity digital-analog mixed-signal loop voltage-controlled oscillator proposed by the present invention, which has an analog voltage input terminal Ca; digital input terminals C0', C0, C1, C2, Cn; oscillating signal output terminals Fout, Fout. The input digital signals of the digital input terminals C0', C0, C1, C2...Cn pass through the internal control circuit, so that the voltage-controlled oscillator outputs a signal frequency that is very close to the expected signal frequency. Due to the quantization error of the digital signal, the signal frequency and There will be a certain error in the expected signal frequency. This frequency error is converted into an error voltage through the phase-locked loop, and then through the analog signal input terminal Ca, the voltage-controlled oscillator is controlled to make its output frequency closer to the expected frequency, and so on. Ultimately locks onto the e...

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Abstract

The disclosed oscillator consists of two parts: delay cells connected in ring, and control circuit for digital-analog composite signal (scheme 1); or delay cells connected in ring, and a digital control circuit (scheme 2). In scheme 1, delay cell is a common difference inverter; the control circuit for digital-analog composite signal is composed of a set of constant current sources with different currents and an active load MOS tube. In scheme 2, the digital control circuit is same as the part of digital control circuit in scheme 1; load tube of delay unit is composed of multiple pairs of load tube. Being controlled by digital signal control circuit, one pair of load tube is in use for presetting frequency or coarse adjusting frequency; being controlled by analog signal, another pair of load tube is in use for adjusting frequency accurately. The invention is applicable to modern communication, digital circuit, and other electronic information processing system.

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 high-precision and high-linearity digital-analog mixed signal loop voltage-controlled oscillator. Background technique [0002] The voltage-controlled oscillator (VCO) is the most important component in the phase-locked loop. In order to obtain high-frequency, high-precision output frequency, the form of an LC voltage-controlled oscillator or a loop voltage-controlled oscillator is generally used. LC voltage-controlled oscillator has low phase noise and has been widely used in the field of wireless communication with high noise index requirements. However, it also has disadvantages such as large power consumption, not wide output frequency range, large area occupied by integrated inductors, and low manufacturing process precision. . The loop voltage controlled oscillator has also been widely used in communicat...

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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