Programmable radio transceiver
A fully integrated, programmable mixed-signal radio transceiver comprising a radio frequency integrated circuit (RFIC) which is frequency and protocol agnostic with digital inputs and outputs, the radio transceiver being programmable and configurable for multiple radio frequency bands and standards and being capable of connecting to many networks and service providers. The RFIC includes a tunable resonant circuit that includes a transmission line having an inductance, a plurality of switchable capacitors configured to be switched into and out of the tunable resonant circuit in response to a first control signal, and at least one variable capacitor that can be varied in response to a second control signal, wherein a center resonant frequency of the resonant circuit is electronically tunable responsive to the first and second control signals that control a first capacitance value of the plurality of switchable capacitors and a second capacitance value of the at least one variable capacitor.
1. An integrated evaluation and test module for a radio transceiver implemented on a semiconductor substrate, the radio transceiver comprising a receiver chain that generates a radio frequency signal, the integrated evaluation and test module being integrated on the semiconductor substrate with the radio transceiver and the integrated evaluation and test module comprising:
a control input adapted to receive a digital control signal;
a signal input adapted to receive a digitized version of the radio frequency signal from the receiver chain of the radio transceiver;
a processing module coupled to the signal input and adapted to receive and process the digitized version of the radio frequency signal from the receiver chain of the radio transceiver, and to provide a digital output signal;
a reference generator adapted to generate a digital reference signal based on information contained in the digital control signal;
a comparator coupled to the reference generator and to the processing module and adapted to receive the digital output signal and the digital reference signal, the comparator being configured to compare the digital output signal with the digital reference signal and to generate an error signal that identifies discrepancies between the digital output signal and the digital reference signal; and
an adjustment module coupled to the comparator and adapted to receive the error signal from the comparator and to generate digital adjustment data based at least in part on the error signal, the adjustment module being further adapted to provide the digital adjustment data to at least one component of the receiver chain of the radio transceiver to adjust at least one parameter of the at least one component so as to modify the radio frequency signal to reduce the error signal.
2. The integrated evaluation and test module of claim 1 , wherein the processing module comprises a processor configured to perform a Fourier transform on the digitized version of the radio frequency signal from the receiver chain of the radio transceiver to provide the digital output signal comprising frequency domain information about the radio frequency signal.
3. The integrated evaluation and test module of claim 1 , wherein the digital reference signal contains frequency domain information corresponding to desired characteristics of the radio frequency signal.
4. The integrated evaluation and test module of claim 3 , wherein the comparator is configured to compare the frequency domain information from the digital output signal with the frequency domain information contained in the digital reference signal and to generate the error signal which contains information about frequency domain variations between the digital output signal and the digital reference signal.
5. The integrated evaluation and test module of claim 4 , wherein the adjustment module includes a finite state machine.
6. A method of testing performance of at least one component of a receiver chain for compliance with a selected communication standard, using an integrated evaluation and test module that is integrated on a semiconductor substrate with the receiver chain, the method comprising:
receiving at the integrated evaluation and test module a digital control signal;
receiving at the integrated evaluation and test module a digitized version of a radio frequency signal from the receiver chain;
processing the digitized version of the radio frequency signal from the receiver chain to provide a digital output signal;
generating a digital reference signal based on information contained in the digital control signal;
comparing the digital output signal with the digital reference signal;
generating an error signal based on the comparison that identifies discrepancies between the digital output signal and the digital reference signal;
generating digital adjustment data based on the error signal; and
providing the digital adjustment data from the integrated evaluation and test module to the at least one component of the receiver chain to adjust at least one parameter of the at least one component so as to modify the radio frequency signal to reduce the error signal.
7. The method of claim 6 , wherein processing the digitized version of the radio frequency signal includes performing a Fourier transform on the digitized version of the radio frequency signal to provide the digital output signal comprising frequency domain information about the radio frequency signal.
8. The method of claim 6 , wherein generating the digital reference signal Includes generating a digital reference signal containing frequency domain information corresponding to desired characteristics of the radio frequency signal.
9. The method of claim 8 , wherein comparing the digital output signal with the digital reference signal includes comparing the frequency domain information from the digital output signal with the frequency domain information contained in the digital reference signal, and wherein generating the error signal includes generating an error signal that contains information about frequency domain variations between the digital output signal and the digital reference signal.
10. The method of claim 6 , wherein the receiver chain is part of a radio transceiver that also comprises a transmitter chain, the method further comprising:
generating a transmit radio frequency signal with the transmitter chain; and
processing the transmit radio frequency signal with the receiver chain to generate the radio frequency signal.