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Slip-detecting phase detector and method for improving phase-lock loop lock time

A phase detector and detector technology, applied in the direction of automatic power control, circuits that oscillate independently of each other, multiple input and output pulse circuits, etc., can solve the problem of increasing frequency source control voltage overshoot, high noise, and expanding phase detection. device, etc.

Inactive Publication Date: 2002-12-25
OPTIS WIRELESS TECH LLC
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Problems solved by technology

But simply extending the range of the phase detector has the disadvantage of increasing the overshoot of the frequency source control voltage
In voltage-limited applications, the tuning sensitivity of the VCO must be increased, resulting in higher noise, or the control voltage will reach its cut-off limit
If the control voltage is truncated, using an extended range digital phase detector to improve PLL lock time will be futile or even lead to the opposite result

Method used

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  • Slip-detecting phase detector and method for improving phase-lock loop lock time

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[0045] Many inconveniences that exist when using a normal phase detector and an extended range phase detector can be overcome by using a phase detector having a slip detection circuit and an output circuit. Compared with ordinary PD, the PLL lock time is shortened. In voltage limited applications, it is not necessary to change the tuning sensitivity of the voltage controlled oscillator (VCO) to prevent clipping of the VCO voltage control signal. Furthermore, having a controller for selecting a predetermined period of time provides versatility, since the controller can adapt the phase detector with the slip detection circuit to a particular environment during which time the slip detection circuit will be corrected. For example, where the operating frequency is changed by several frequency steps, a larger value for the predetermined time period may be expected than where the operating frequency is changed by only one or two frequency steps.

[0046] In general, the present inve...

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Abstract

An improved digital phase detector is provided for detecting and compensating for a cycle slip between a reference signal and a frequency source signal, the reference and frequency source signals each comprising pulses, each pulse defined by a leading edge and a trailing edge. The digital phase detector includes a detector circuit for detecting a cycle slip where two successive leading edges of one of the reference and frequency source signals are received before a leading edge of the other signal is received. An output circuit is operatively coupled to the detector circuit for developing a correction signal responsive to said detecting.

Description

field of invention [0001] This invention relates to phase detectors and, more particularly, to digital phase detectors with slip detection capability for shortening phase locked loop lock times. Background of the invention [0002] One form of phase-locked loop (PLL) includes a phase detector, charge pump, loop filter, voltage-controlled oscillator (VCO), frequency divider, and reference frequency signal source. The PLL synthesizes a frequency source signal, such as a VCO, based on a reference frequency signal source (reference signal), such as a crystal oscillator. The phase detector maintains the frequency and phase of the frequency source and the reference signal at its input equal by determining the phase mismatch between the divided frequency source and the reference signal and activating the charge pump according to the phase mismatch. Due to the physical characteristics of the equipment, the dynamic characteristics of the loop and the system structure, the above corr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/26H03D13/00H03L7/089H03L7/183
CPCH03D13/004H03L7/0891H03L7/183
Inventor S·L·怀特N·克莱默
Owner OPTIS WIRELESS TECH LLC
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