FM TRANSMITTER AND NON-FM RECEIVER INTEGRATED ON SINGLE CHIP
First Claim
1. An integrated circuit comprising:
- a frequency modulation (FM) transmitter to receive a digital input signal, perform FM modulation with the digital input signal, and provide an output FM signal; and
a non-FM receiver to receive a radio frequency (RF) signal, perform demodulation for the received RF signal, and provide a baseband output signal.
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Accused Products
Abstract
Exemplary embodiments include a frequency modulation (FM) transmitter and a non-FM receiver, which may be implemented on the same IC chip. The FM transmitter may include a digital FM modulator, a lowpass filter, an amplifier, and an LC tank circuit. The digital FM modulator may receive a digital input signal, perform FM modulation with the digital input signal, and provide a digital FM signal. The lowpass filter may filter the digital FM signal and provide a filtered FM signal. The amplifier may amplify the filtered FM signal and provide an output FM signal. The LC tank circuit may filter the output FM signal. The digital FM modulator may perform FM modulation by changing a variable divider ratio of a multi-modulus divider within a PLL. A delta-sigma modulator may receive the digital input signal and generate a modulator output signal used to obtain the variable divider ratio.
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Citations
25 Claims
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1. An integrated circuit comprising:
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a frequency modulation (FM) transmitter to receive a digital input signal, perform FM modulation with the digital input signal, and provide an output FM signal; and a non-FM receiver to receive a radio frequency (RF) signal, perform demodulation for the received RF signal, and provide a baseband output signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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a digital frequency modulation (FM) modulator to receive a digital input signal, perform FM modulation with the digital input signal, and provide a digital FM signal; and a lowpass filter to filter the digital FM signal and provide a filtered FM signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a digital frequency modulation (FM) modulator to receive a digital input signal, perform FM modulation with the digital input signal, and provide a digital FM signal; and an LC tank circuit to perform filtering for the digital FM signal and provide an output FM signal. - View Dependent Claims (16, 17)
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18. A wireless device comprising:
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a digital frequency modulation (FM) modulator to receive a digital input signal, perform FM modulation with the digital input signal, and provide a digital FM signal; and a small antenna to transmit an output FM signal generated based on the digital FM signal, the small antenna having a size smaller than a quarter wavelength of a highest FM frequency.
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19. A method of performing frequency modulation (FM), comprising:
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performing digital FM modulation with a digital input signal to obtain a digital FM signal; and lowpass filtering the digital FM signal to obtain a filtered FM signal. - View Dependent Claims (20, 21, 22)
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23. An apparatus for performing frequency modulation (FM), comprising:
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means for performing digital FM modulation with a digital input signal to obtain a digital FM signal; and means for lowpass filtering the digital FM signal to obtain a filtered FM signal. - View Dependent Claims (24, 25)
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Specification