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Frequency drift detector, communication unit and method therefor

A frequency drift, detector technology used in electrical components, automatic control of power, multiple input and output pulse circuits, etc.

Pending Publication Date: 2020-04-24
NXP USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This effectively means that due to frequency drift of the crystal oscillator 105, the PLL may remain locked outside the desired operating frequency range

Method used

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  • Frequency drift detector, communication unit and method therefor
  • Frequency drift detector, communication unit and method therefor
  • Frequency drift detector, communication unit and method therefor

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Embodiment Construction

[0039] According to some example embodiments of the present invention, there is provided a frequency drift detector and method of calibrating frequency drift detection, for example in which the frequency drift variation may be higher than an expected frequency drift range. In some examples, the frequency drift detector circuit (and one or more associated methods) uses a frequency-to-voltage converter to provide an indication of the frequency drift as a voltage and compares this converted voltage to a known calibration voltage. In this way, the present inventors have realized that it is possible to evaluate parameters associated with frequency drift changes by comparison operations, rather than unavailable (reference) frequency signals, thereby avoiding the above-mentioned problems found in communication units like modern radar units. current issues.

[0040] In some examples, it is envisaged to convert the frequency drift detection of the crystal oscillator output into a DC vo...

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Abstract

The present invention relates to a frequency drift detector, a communication unit and a method thereof. The frequency drift detector (490) includes a frequency-to-voltage converter, FVC, (450) arranged to receive a reference frequency signal (407) and configured to generate an FVC output voltage (455). The frequency drift detector (490) also includes a voltage regulator (310) arranged to output atleast one regulated voltage; and a voltage comparator (460) coupled to an output of the FVC (450) and an output of the voltage regulator (310). The voltage comparator (460) is arranged to compare theFVC output voltage (455) and the at least one regulated voltage (458) and generate an error signal (470) in response to determining that the FVC output voltage (455) exceeds a frequency drift level indicated by the at least one regulated voltage (458).

Description

technical field [0001] The technical field of the invention relates to frequency drift detectors and their calibration methods eg for frequency synthesizers and communication units such as automotive radar units. Background technique [0002] Modern automotive frequency-modulated continuous-wave (FMCW) radar systems typically use a transceiver consisting of a transmitter, receiver, and frequency synthesizer source. In many wireless communication applications today, frequency synthesizers are used to facilitate radio frequency communication and are often implemented by means of a phase-locked loop (PLL), which often uses a crystal oscillator (XCO) as the Controlled oscillator (VCO) reference signal. A frequency synthesizer generates (often referred to as 'synthesizing') an output radio frequency (sometimes referred to as a 'local oscillator') signal for transmitting and / or receiving radio frequency signals. Frequency synthesizers are also used to generate the FMCW waveforms...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/089
CPCH03L7/0891H03L1/02H03L1/027H03L7/099H03L7/23H03L2207/06H02M3/07H03K5/24H03K19/21
Inventor P·P·萨瓦利M·布沙耶C·帕瓦欧莫利拉
Owner NXP USA INC