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Phase locked loop circuit, electronic device including a phase locked loop circuit and method for generating a periodic signal

A phase-locked loop and equipment technology, applied in the direction of electrical components, automatic power control, etc., can solve problems such as long stabilization time

Inactive Publication Date: 2009-04-08
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, the system will have a longer settling time than a system with no null but the same bandwidth

Method used

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  • Phase locked loop circuit, electronic device including a phase locked loop circuit and method for generating a periodic signal
  • Phase locked loop circuit, electronic device including a phase locked loop circuit and method for generating a periodic signal
  • Phase locked loop circuit, electronic device including a phase locked loop circuit and method for generating a periodic signal

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Embodiment Construction

[0021] The following terms will be used in this article: The transfer function H(s) is the relationship between the input and output signals of a device seen in the Laplace s-domain, and in the literature, the transfer function is also called the system function . For s=jω, j is the square root of -1, ω is the signal frequency, and the system function is also called frequency response. Forward path transfers refer to transfers made via the forward path of the system. The loop gain of the feedback system is then transmitted via the forward path and then back via the feedback path. The closed-loop transfer of the system Hclosed refers to the transfer of the system from the input to the output in the presence of feedback. The device poles are the (complex) frequencies at which the device transfer function tends to infinity. The device zero is the (complex) frequency at which the device transfer function goes to zero.

[0022] Figure 1 shows a conventional block diagram of a p...

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Abstract

A phase locked loop (PLL) circuit comprising a loop input; a phase detector section for detecting a phase difference between an input signal and a reference signal. The phase detector section has a detector input connected to the loop input, a reference input and a detector output for outputting a signal related to the phase difference. A controlled oscillator is connected with an input to the detector output and an oscillator output is connected to a loop output. The PLL has a feedback circuit which connects the oscillator output to the reference input, wherein the feedback circuit includes a device having atransfer function with at least one zero.

Description

technical field [0001] The invention relates to a phase-locked loop circuit (PLL), an electronic device including the circuit and a method for generating a periodic signal. Background technique [0002] PLLs are well known in the art. Generally, a PLL includes a phase detector for detecting the phase difference between an input signal and a reference signal. The output of the phase detector is connected to a voltage controlled oscillator (VCO), which provides an output signal whose frequency depends on the voltage of the signal provided at the input of the VCO. A (loop) filtering section is often provided between the phase detector and the VCO. And the VCO is connected to a feedback circuit. The output of this feedback circuit provides a reference signal that is used by the phase detector to compare with the input signal. Typically, the feedback circuit also includes a frequency divider to convert the frequency of the reference signal to the frequency of the PLL input si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/093H03L7/18H03L7/10H03L7/183H03L7/185H03L7/197
CPCH03L7/1976H03L7/183H03L7/185H03L7/093H03L7/18H03L7/1974
Inventor J·W·T·埃肯布罗伊克
Owner TELEFON AB LM ERICSSON (PUBL)