Software programmable cellular radio architecture for telematics and infotainment
First Claim
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 triplexer coupled to the antenna structure and including a plurality of 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 triplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, 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 from the circulator and a feedback signal from the quantizer circuit and providing an error signal to the LNA to provide an amplified error signal, said amplified 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, and wherein the quantizer circuit is an interleaving quantizer circuit that interleaves multiple groups of bits from the filter; and
a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a power amplifier and a switch for directing the transmit signals to one of the signal paths in the triplexer.
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Accused Products
Abstract
A cellular radio architecture for a vehicle that includes a programmable bandpass sampling radio frequency front-end and an optimized digital baseband. The architecture includes a triplexer having signal paths that include 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. The architecture also includes a receiver module having a separate signal channel for each of the signal paths in the triplexer, where each signal channel in the receiver module includes 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, where the transmitter module includes a power amplifier and a switch for directing the transmit signals to one of the signal paths in the triplexer.
25 Citations
20 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 triplexer coupled to the antenna structure and including a plurality of 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 triplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, 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 from the circulator and a feedback signal from the quantizer circuit and providing an error signal to the LNA to provide an amplified error signal, said amplified 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, and wherein the quantizer circuit is an interleaving quantizer circuit that interleaves multiple groups of bits from the filter; and a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a power amplifier and a switch for directing the transmit signals to one of the signal paths in the triplexer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. 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 a plurality of 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 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 from the circulator and a feedback signal from the quantizer circuit and providing an error signal to the LNA to provide an amplified error signal, said amplified 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, and wherein the quantizer circuit includes a data weighted averaging (DWA) digital shaper that modulates digital thermal codes to shape voltage and timing mismatches; and a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a power amplifier and a switch for directing the transmit signals to one of the signal paths in the multiplexer.
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20. 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 a plurality of 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; and a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a power amplifier and a switch for directing the transmit signals to one of the signal paths in the multiplexer, wherein the transmitter module further includes a data weighted averaging (DWA) circuit that receives the transmit signals from the transmitter delta-sigma modulator and a digital-to-analog converter (DAC) that receives the transmit signals from the DWA circuit.
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Specification