Frequency locking method, voltage-controlled oscillator and frequency generating unit

A voltage-controlled oscillator and control unit technology, applied in the field of communication, can solve the problems affecting the data transmission rate, long frequency locking time, slow frequency conversion speed, etc., and achieve the effect of reducing the difference, short locking time, and fast speed

Active Publication Date: 2012-10-03
HYTERA COMM CORP
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AI Technical Summary

Problems solved by technology

At present, the frequency locking time of the frequency generation unit is long, and the frequency conversion speed is slow, which affects the data transmission rate

Method used

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  • Frequency locking method, voltage-controlled oscillator and frequency generating unit
  • Frequency locking method, voltage-controlled oscillator and frequency generating unit
  • Frequency locking method, voltage-controlled oscillator and frequency generating unit

Examples

Experimental program
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Effect test

Embodiment Construction

[0063] see figure 1 , the frequency locking process is divided into three stages:

[0064] T1: Capture Phase (capture phase): Due to the switching of frequency points, the frequency changes sharply from stable to unstable, the phase difference between the output frequency and the phase detection frequency of the reference clock is very large, and the phase-locked loop is in an out-of-lock state, requiring a large number of pump current to capture the target frequency.

[0065] T2: Track Phase: The phase difference between the output frequency and the phase detection frequency of the reference clock is small, and the phase-locked loop tracks the output frequency, which belongs to the stage of loop self-regulation.

[0066] T3: Stable Phase: The phase difference between the output frequency and the phase detection frequency of the reference clock is very small, and the phase-locked loop is in a locked state. When the frequency deviation is less than ±100Hz, the phase-locked lo...

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PUM

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Abstract

The invention process a frequency loading method, which comprises the following steps: a control unit generates auxiliary control voltage corresponding to target oscillation frequency and inputs the auxiliary control voltage to a voltage-controlled oscillator provided by the invention; a loop filter inputs the control voltage to the voltage-controlled oscillator; and the auxiliary control voltage enables an equivalent capacitance value of a frequency selective network circuit to change C1, and the control voltage enables an equivalent capacitance value of the frequency selective network circuit network circuit to change C2, wherein the sum of the C2 and the C2 is C3, the C3 is a capacitance value of the equivalent capacitance value change of the frequency selective network circuit when the frequency of a signal generated by the frequency selective network is changed into the target oscillation frequency from the current frequency, and the absolute value of the C3 is larger than of the C2. When the auxiliary control voltage is reasonable in design, the output frequency is changed to a certain degree, the difference value of the control voltage change is little, and therefore the frequency can be locked more rapidly. The invention also provides the voltage-controlled oscillator and a frequency generating unit.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a frequency locking method, a voltage-controlled oscillator and a frequency generating unit. Background technique [0002] Frequency generating units are very important in modern communication systems and information processing systems. As the local oscillator source of the transmitter and receiver of the radio frequency communication system and the clock source of the digital signal processing system, the performance index of the frequency generation unit directly affects the performance index of the radio frequency communication system and the digital signal processing system. At present, with the improvement of data transmission speed, the locking time of the frequency generation unit has become one of the key indicators of the design. The shorter the locking time of the frequency generating unit is, the faster the frequency conversion speed is, and thus the faster the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099H03L7/18
Inventor 冷鹏童伟黄成富朱敏
Owner HYTERA COMM CORP
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