Phase locked loop with loop gain stabilization circuit
First Claim
1. A phase locked loop comprising:
- a source of a first signal having a predetermined range of frequencies;
a source of a second signal;
a linear phase detector responsive to said first signal and said second signal for comparing the relative phase of said first signal and said second signal; and
a loop gain stabilization circuit means coupled between said source of said first signal and said linear phase detector for reducing the magnitude of variations in the loop gain of said phase locked loop over said predetermined range of frequencies of said first signal source.
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Accused Products
Abstract
A phase locked loop includes a linear phase detector responsive to a first signal having a predetermined range of frequencies and a second signal for comparing the relative phase of the first signal and the second signal, and a loop gain stabilization circuit coupled between the source of the first signal and the linear phase detector for reducing the magnitude of variations in the loop gain of the phase locked loop over the predetermined range of frequencies of the first signal source. An embodiment of the linear phase detector comprises a harmonic sampler/presteer circuit. The construction and operation of the loop gain stabilization circuit depends on whether the phase locked loop is being used in a frequency multiplying or dividing circuit.
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Citations
42 Claims
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1. A phase locked loop comprising:
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a source of a first signal having a predetermined range of frequencies; a source of a second signal; a linear phase detector responsive to said first signal and said second signal for comparing the relative phase of said first signal and said second signal; and a loop gain stabilization circuit means coupled between said source of said first signal and said linear phase detector for reducing the magnitude of variations in the loop gain of said phase locked loop over said predetermined range of frequencies of said first signal source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of stabilizing the gain in a phase locked loop comprising the steps of:
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providing a first signal having a frequency within a predetermined range of frequencies; providing a second signal; comparing the relative phase of said first signal and said second signal in a linear phase comparator; and filtering said first signal for reducing the magnitude of variations in the loop gain of said phase locked loop over said predetermined range of frequencies of said first signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification