Modifying a sampling frequency in a radio frequency digital to analog converter
First Claim
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1. A communication system using an increased sampling rate comprising:
- a baseband signal generator configured to generate a baseband signal;
a phase locked loop (PLL) configured to generate a local oscillator (LO) signal and an inverted LO signal;
an interpolator configured to generate an interpolated/delayed data stream from a baseband original data stream;
a cell control circuit configured to generate control signals based on the interpolated data stream and the baseband original data stream; and
a radio frequency digital to analog converter (RFDAC) configured to generate a radio frequency (RF) output signal from the baseband signal using an increased sampling rate, the LO signal, the inverted LO signal, and the control signals, wherein the increased sampling rate is higher than a frequency of the LO signal.
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Abstract
A communication system using an increased sampling rate includes a baseband signal generator and a PLL that generates an LO signal and an inverted LO signal. An interpolator generates an interpolated/delayed data stream from a baseband original data stream, and a cell control circuit generate control signals based on the interpolated data stream and the baseband original data stream. An RFDAC generates an RF output signal from the baseband signal using an increased sampling rate, the LO signal, the inverted LO signal, and the control signals.
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Citations
11 Claims
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1. A communication system using an increased sampling rate comprising:
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a baseband signal generator configured to generate a baseband signal; a phase locked loop (PLL) configured to generate a local oscillator (LO) signal and an inverted LO signal; an interpolator configured to generate an interpolated/delayed data stream from a baseband original data stream; a cell control circuit configured to generate control signals based on the interpolated data stream and the baseband original data stream; and a radio frequency digital to analog converter (RFDAC) configured to generate a radio frequency (RF) output signal from the baseband signal using an increased sampling rate, the LO signal, the inverted LO signal, and the control signals, wherein the increased sampling rate is higher than a frequency of the LO signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of generating a radio frequency (RF) output signal using an increased sampling rate, the method comprising:
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generating a baseband signal by a baseband signal generator; generating a local oscillator (LO) signal and an inverted LO signal by a phase locked loop (PLL); generating interpolated values by a radio frequency digital to analog converter (RFDAC) based on consecutive samples of the baseband signal and one or more control signals; and combining the interpolated values with the consecutive samples to generate the RF output signal. - View Dependent Claims (9, 10, 11)
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Specification