Novatel Wireless, Inc.

Novatel Communications Ltd.

Humphrey Gordon

Slim S Souissi

Michael Loh

Ashfaq Choudhury

A multi-mode modem comprises a first device configured to communicate with a first communication system, a second device configured to communicate with a second communication system, a processor communicatively coupled the first and second devices, and a control function configured to place the device in one of the following communication modes: 1) communication with the first communication system; 2) communication with the second communication system; 3) simultaneous communication with both the first and second communication systems; or 4) gateway communication between the first and second communication systems.

Systems and methods for a multi-mode wireless modem

A system uses a charge storage unit to produce shaped pulses in response to an incoming digital signal. The system detects transitions or patterns in the digital signal and produces a charging waveform that controls the charge maintained in the charge storage unit, and thus, the instantaneous value of an output voltage produced by the unit. The charging waveform is, in turn, controlled by transition characteristics or counts that are stored, respectively, in transition memories. In the case of a binary transmission the memories contain rising and falling characteristics. These memories are addressed by addresses generated in response to the detection of a pattern, or as appropriate, a transition in the incoming digital signal. The charging waveform may be a series of pulses with varying widths, a signal that has a variable duty cycle, or a varying pulse count. The charging waveform controls the charging of capacitors in the charge storage unit, which consists essentially of cascaded low pass filters. In a preferred embodiment, a buffer amplifier is placed between the low pass filters, to isolate them and allow the system to control more easily the amplitudes of the shaped pulses.

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Calgary, Canada

Humphrey Gordon