Cellnet Data Systems, Inc.

Ttpcom Limited

Schlumbergersema Inc.

Mstar Semiconductor, Inc.

Mstar France Sas

Mstar Software R&d, Ltd.

Andrew Gordon Summers

Clive Russell Irving

Gregory Vincent Luxford

Thomas Sean Houlihane

Trahern Stuart Rayner

Colin Richard Smithers

An electronic system for accurately controlling the RF output power from a power amplifier () is implemented using a multiplier () which multiplies the output power by itself to provide a DC component which is fed to a variable gain amplifier () which provides a controlling signal via a comparator () and an integrator () to the power amplifier. The transfer function between controlling signal and output power is substantially linear, even during dynamic variation of the controlling signal. The system is capable of a large dynamic range, and exhibits constant control loop bandwidth over this range. This is of particular use to TDMA applications with a large dynamic range of levelled output powers because a fixed filter function can be used to shape the transmitted burst.

Transmitter RF power control

A transmitter to transmit data from an end-point includes a reference oscillator; a low pass filter coupled to the reference oscillator; a modulation filter to provide an over-sampled modulated signal; a synthesizer coupled to the low pass filter and the modulation filter; and a sine wave generator coupled to the synthesizer.

Transmitter tolerant to crystal variations

A receiver which is capable of receiving in parallel data transmitted at arbitrary frequencies within a radio channel includes: a radio frequency (RF) front end to convert an RF signal to a digitized signal; a Fast Fourier Transform (FFT) generator coupled to the RF front-end to separate the digitized signal into a plurality of sub-channels; a bank of phase locked loops (PLLs) coupled to the FFT generator, each PLL operating on a sub-channel with a sub-channel center; and a flag detector coupled to the bank of PLLs to detect variations from the sub-channel center and to recover the usage data transmitted from the end-point.

Receiver capable of parallel demodulation of messages

A remote data collection system for collecting usage data from an endpoint includes a monitoring module coupled to the endpoint, the monitoring module having a wireless transmitter to transmit the usage data. The system also includes a receiver to receive usage data from the wireless transmitter of the monitoring module, the receiver capable of receiving in parallel data transmitted at arbitrary frequencies within a radio channel.

System for remote data collection

Growing community of inventors

Cambridge, United Kingdom

Andrew Gordon Summers