Optimized data converter design using mixed semiconductor technology for flexible radio communication systems
First Claim
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1. A transceiver front-end circuit for a cellular radio, said transceiver circuit comprising:
- an antenna structure operable to transmit signals and receive signals;
a multiplexer coupled to the antenna structure and including three signal paths, each signal path including a bandpass filter that passes a different frequency band than the other bandpass filters and a circulator that provides signal isolation between the transmit signals and the receive signals;
a receiver module including a separate signal channel for each of the signal paths in the multiplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, wherein portions of the receiver module are fabricated with silicon germanium (SiGe) technologies and portions of the receiver module are fabricated with CMOS technologies; and
a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a tunable bandpass filter, a power amplifier and a switch for directing the transmit signals to one of the signal paths in the multiplexer, wherein portions of transmitter module are fabricated with silicon germanium (SiGe) technologies and portions of the transmitter module are fabricated with CMOS technologies.
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Abstract
A cellular radio architecture that includes a receiver module having a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal. The architecture further includes a transmitter module having a transmitter delta-sigma modulator for converting digital data bits to analog transmit signals. Portions of the receiver and transmitter modules are fabricated with silicon germanium (SiGe) technologies and portions of the receiver and transmitter modules are fabricated with CMOS technologies.
19 Citations
18 Claims
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1. A transceiver front-end circuit for a cellular radio, said transceiver circuit comprising:
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an antenna structure operable to transmit signals and receive signals; a multiplexer coupled to the antenna structure and including three signal paths, each signal path including a bandpass filter that passes a different frequency band than the other bandpass filters and a circulator that provides signal isolation between the transmit signals and the receive signals; a receiver module including a separate signal channel for each of the signal paths in the multiplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, wherein portions of the receiver module are fabricated with silicon germanium (SiGe) technologies and portions of the receiver module are fabricated with CMOS technologies; and a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a tunable bandpass filter, a power amplifier and a switch for directing the transmit signals to one of the signal paths in the multiplexer, wherein portions of transmitter module are fabricated with silicon germanium (SiGe) technologies and portions of the transmitter module are fabricated with CMOS technologies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A transceiver front-end circuit for a cellular radio, said transceiver circuit comprising:
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an antenna structure operable to transmit signals and receive signals; a multiplexer coupled to the antenna structure and including three signal paths, each signal path including a bandpass filter that passes a different frequency band than the other bandpass filters and a circulator that provides signal isolation between the transmit signals and the receive signals; a receiver module including a separate signal channel for each of the signal paths in the multiplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, wherein portions of the receiver module are fabricated with silicon germanium (SiGe) technologies and portions of the receiver module are fabricated with CMOS technologies, and wherein each receiver delta-sigma modulator includes a combiner, a low noise amplifier (LNA), an LC filter and a quantizer circuit, said combiner receiving the receive signals and a feedback signal from the quantizer circuit and providing an error signal to the LNA to provide an amplified error signal, said amplifier error signal being provided to the LC filter to provide a filtered error signal, and the filtered error signal being provided to the quantizer circuit, wherein the combiner, the LNA and portions of the LC filter are fabricated with SiGe technologies and portions of the LC filter are fabricated with CMOS technologies; and a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a tunable bandpass filter, a power amplifier and a switch for directing the transmit signals to one of the signal paths in the multiplexer, wherein portions of transmitter module are fabricated with silicon germanium (SiGe) technologies and portions of the transmitter module are fabricated with CMOS technologies.
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18. A transceiver front-end circuit for a cellular radio, said transceiver circuit comprising:
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an antenna structure operable to transmit signals and receive signals; a multiplexer coupled to the antenna structure and including three signal paths, each signal path including a bandpass filter that passes a different frequency band than the other bandpass filters and a circulator that provides signal isolation between the transmit signals and the receive signals; a receiver module including a separate signal channel for each of the signal paths in the multiplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, wherein portions of the receiver module are fabricated with silicon germanium (SiGe) technologies and portions of the receiver module are fabricated with CMOS technologies, and wherein each receiver delta-sigma modulator includes a combiner, a low noise amplifier (LNA), a summation node, an LC filter and a quantizer circuit, said summation node receiving amplified receive signals from the LNA and a feedback signal from the quantizer circuit and providing an error signal to the LC filter to provide a filtered error signal, where the filtered error signal is provided to the quantizer circuit, wherein the combiner, the LNA and portions of the LC filter are fabricated with SiGe technologies and portions of the LC filter are fabricated with CMOS technologies; and a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a tunable bandpass filter, a power amplifier and a switch for directing the transmit signals to one of the signal paths in the multiplexer, wherein portions of transmitter module are fabricated with silicon germanium (SiGe) technologies and portions of the transmitter module are fabricated with CMOS technologies.
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Specification