Modulator and method for producing a modulated signal
First Claim
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1. A modulator for producing a modulated signal, the modulator comprising:
- a direct modulation synthesizer circuit;
a reference frequency oscillator for providing an input reference signal to the direct modulation synthesizer circuit for locking a carrier frequency to a stable frequency;
a pre-emphasis unit for receiving data bits and for producing a modulating signal for direct modulation of the direct modulation synthesizer circuit, the modulating signal having data bit dependent voltage levels.
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Abstract
A modulator including a direct modulation synthesizer circuit, a reference frequency oscillator for providing an input reference signal to the direct modulation synthesizer circuit for locking a carrier frequency to a stable frequency and a pre-emphasis unit for receiving data bits and for producing a modulating signal for direct modulation of the direct modulation synthesizer circuit, the modulating signal having data bit dependent voltage levels.
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Citations
23 Claims
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1. A modulator for producing a modulated signal, the modulator comprising:
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a direct modulation synthesizer circuit;
a reference frequency oscillator for providing an input reference signal to the direct modulation synthesizer circuit for locking a carrier frequency to a stable frequency;
a pre-emphasis unit for receiving data bits and for producing a modulating signal for direct modulation of the direct modulation synthesizer circuit, the modulating signal having data bit dependent voltage levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An in-vivo sensing device comprising a modulator for producing a modulated signal, the modulator comprising:
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a direct modulation synthesizer circuit;
a reference frequency oscillator for providing an input reference signal to the direct modulation synthesizer circuit for locking a carrier frequency to a stable frequency;
a pre-emphasis unit for receiving data bits and for producing a modulating signal for direct modulation of the direct modulation synthesizer circuit, the modulating signal having data bit dependent voltage levels. - View Dependent Claims (13, 14)
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15. A method for producing a modulated signal, comprising:
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providing a direct modulation synthesizer circuit;
inputting a reference signal having a given frequency to the direct modulation synthesizer circuit for locking a carrier frequency to a stable frequency;
inputting a modulation signal to the direct modulation synthesizer circuit, the modulation signal having data bit dependent voltage levels; and
outputting the modulated signal from the direct modulation synthesizer circuit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification