Frequency synthesizer with spur compensation
First Claim
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1. A frequency synthesizer for providing a synthesized output frequency fO comprising:
- a synthesizer loop including a programmable divider;
a divider control means providing divider values to the programmable divider, the divider control means providing varying values to the programmable divider for fractional division to produce a desired output frequency fO, and including first and second accumulator means;
the first accumulator means including an input for receiving data, a first output for varying the divide value, and a second output for providing data to the second accumulator means, andthe second accumulator means including an input connected to the second output of the first accumulator means and an output for varying the divide value;
the first and second accumulator means each having a variable capacity.
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Abstract
A synthesizer circuit with spur compensation utilizes fractional division in the synthesizer loop. Two accumulators are utilized for determining the divisor value N. The capacity of the two accumulators is selectable. An offset value is selectively introduced into the accumulators in order to produce a waveform having an acceptable spurious content.
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6 Claims
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1. A frequency synthesizer for providing a synthesized output frequency fO comprising:
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a synthesizer loop including a programmable divider; a divider control means providing divider values to the programmable divider, the divider control means providing varying values to the programmable divider for fractional division to produce a desired output frequency fO, and including first and second accumulator means; the first accumulator means including an input for receiving data, a first output for varying the divide value, and a second output for providing data to the second accumulator means, and the second accumulator means including an input connected to the second output of the first accumulator means and an output for varying the divide value; the first and second accumulator means each having a variable capacity. - View Dependent Claims (2, 3, 4, 5)
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6. A frequency synthesizer for providing a synthesized output frequency fO comprising:
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a synthesizer loop including a programmable divider; a divider control means providing divider values to the programmable divider, the divider control means providing varying values to the programmable divider for fractional division to produce a desired output frequency fO, and including first and second accumulator means; the first accumulator means including an input for receiving data, a first output for varying the divide value, and a second output for providing data to the second accumulator means, and the second accumulator means including an input connected to the second output of the first accumulator means and an output for varying the divide value; means for providing an offset value to the first and second accumulator means.
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Specification