SOFTWARE PROGRAMMABLE CELLULAR RADIO ARCHITECTURE FOR WIDE BANDWIDTH RADIO SYSTEMS INCLUDING TELEMATICS AND INFOTAINMENT SYSTEMS
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 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 tunable bandpass filter, a switch for directing the transmit signals to a particular signal path, and a power amplifier in each signal path for amplifying the transmit signal before transmitting.
1 Assignment
0 Petitions
Accused Products
Abstract
A cellular radio architecture that includes a programmable bandpass sampling radio frequency front-end and an optimized digital baseband. The architecture includes a multiplexer 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 multiplexer, 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 multiplexer.
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Citations
32 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 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 tunable bandpass filter, a switch for directing the transmit signals to a particular signal path, and a power amplifier in each signal path for amplifying the transmit signal before transmitting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A transceiver front-end circuit for a vehicle 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, each receiver delta-sigma modulator including a low noise amplifier (LNA), an LC filter and a quantizer circuit, wherein the quantizer circuit receives a filtered error signal from the LC filter and provides an estimation of the receive signal, and wherein the quantizer circuit is an interleaving quantizer circuit that interleaves multiple groups of bits from the filter, and wherein the quantizer circuit includes a plurality of groups of analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), wherein the ADCs receive the filtered error signal from the filter, and wherein the bits from the ADCs are provided to the DACs in the interleaving process, and wherein the output of the DACs is provided to the combiner; 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 switch for directing the transmit signals to a particular signal path, and a power amplifier in each signal path for amplifying the transmit signal before transmitting. - View Dependent Claims (25, 26, 27, 28)
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29. A transceiver front-end circuit for a vehicle 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 tunable bandpass filter, a switch for directing the transmit signals to a particular signal path, and a power amplifier in each signal path for amplifying the transmit signal before transmitting, said transmitter module further including 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, wherein the DWA circuit modulates the digital thermal codes to shape out voltage and timing mismatch through DAC weighting elements, and wherein the transmitter delta-sigma modulator includes a dynamic element matching (DEM) circuit that employs an interleaving DEM algorithm. - View Dependent Claims (30)
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31. 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-switch module 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, a circulator that provides signal isolation between the transmit signals and the receive signals, a variable load-attenuator module including signal dissipation circuitry, and switches for selectively directing the transmit signals either to the antenna structure or through the variable load-attenuator module; a receiver module including a separate signal channel for each of the signal paths in the multiplexer-switch module, 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 tunable bandpass filter, a transmit signal switch for directing the transmit signals to a particular signal path, and a power amplifier for each signal path and for amplifying the transmit signal before transmitting. - View Dependent Claims (32)
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Specification