Patent
Digital phase locked loop
Norman L. Culp
- 09 Jul 1984
121
TL;DR: In this paper, a digital phase locked loop is provided by the present invention which includes a digital controlled oscillator (DCO), whereby the frequency of the output signal of the DCO is a function of the value associated with a digital input word.
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Abstract: A digital phase locked loop is provided by the present invention which includes a digital controlled oscillator (DCO), whereby the frequency of the output signal of the DCO is a function of the value associated with a digital input word. The frequency of the output signal of the DCO is phase compared to a reference signal by a phase comparator. Depending upon which signal is leading or lagging, the phase comparator outputs an increment signal or a decrement signal. These increment and decrement signals are operatively coupled to an up/down counter which provides the digital input word to the DCO, the value of the digital input word being modified by the increment or decrement signal to cause the frequency of the output signal to track the frequency of the input signal to the phase comparator, i.e., the frequency of the reference signal.
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Citations
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TL;DR: In this paper, a clock signal supplying device with an automatic phase regulating function for preventing errors in the phase regulation due to noise is presented, where a noise filter is provided which detects phase regulation errors to effect correct phase regulation.
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Method and apparatus for performing frequency detection
James R. Lundberg,Charles E. Nuckolls +1 more
- 13 Dec 1993
TL;DR: In this article, the frequency detection in an all digital phase lock loop is performed using a frequency detector (11) coupled to an digitally controlled oscillator (DCO 16), which is then disabled to allow frequency adjustments to occur via other circuitry.
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Digital phase lock clock generator without local oscillator
Mitchell Alsup,Carl S. Dobbs,Yung Wu,Claude Moughanni,Elie I. Haddad +4 more
- 10 Aug 1989
TL;DR: In this paper, a phase detector (PD), terminated with a latch, controls an up/down counter that programs an increase/decrease of delay on the delay line.
59
References
Patent
Frequency/phase locked loop circuit using digitally controlled oscillator
Patrick J. Hart
- 04 Aug 1980
TL;DR: In this paper, a comparator means is coupled to the oscillator and the reference signal for determining the presence or absence of a frequency or phase difference between the output frequency signal and a reference frequency signal.
35
Patent
Simplified frequency to digital converter using all digital electronics
Phillip W. Ward,Halbert H. Bybee +1 more
- 23 Sep 1974
TL;DR: In this article, an all digital circuit converted a signal of an unknown frequency into an accurate binary representation of that frequency and provided this number as the system output, where the closed loop system generated a reference signal and forced the frequency thereof to approximate that of the unknown signal.
21