| Toumaz Technology Limited Patent applications |
| Patent application number | Title | Published |
|---|
| 20110050319 | Multiplier, Mixer, Modulator, Receiver and Transmitter - A multiplier is provided, for example, for use as a mixer in a modulator of a radio frequency transmitter. The multiplier multiplies a first alternating signal of constant amplitude by a second signal, for example, in the form of a carrier wave from a local oscillator. The multiplier comprises a transconductance stage for converting the first signal to a differential output current and a current switching stage for switching the differential output current in accordance with the second signal. The transconductance stage comprises a plurality of offset pairs of transistors, whose inputs and outputs are connected in parallel. The switching stage comprises cross-coupled pairs of transistors which, together with the transconductance stage, form a Gilbert cell. The relative gains of the transistors of each offset pair are such that a minimum in the third harmonic distortion characteristic of the multiplier occurs substantially at the amplitude of the first signal. | 03-03-2011 |
| 20110003610 | Monitoring and Tracking of Wireless Sensor Devices - A healthcare monitoring system includes a plurality of patient wearable sensor devices for the purpose of monitoring physiological data, each sensor device including a radio frequency transceiver. A plurality of base stations are provided at respective fixed locations within a healthcare facility, each base station including a radio frequency transceiver for communicating with one or more of the sensor devices for the purpose of receiving monitored physiological data. A central server is coupled to the base stations for the purpose of receiving and recording monitored physiological data. Each sensor device is arranged in use to attach to a first base station that is within range, and to attach to a second, different base station that is within range when contact with the first base station is lost, attachment of the sensor device to a base station being registered with the central server. | 01-06-2011 |
| 20100239051 | Automatic Frequency Correction - A receiver front end receives a local frequency reference signal and a Frequency Shift Keying modulated signal comprising a synchronisation sequence, and downconverts the Frequency Shift Keying modulated signal to provide baseband in-phase and quadrature signals. A pulse generator receives the in-phase and quadrature signals, and generates an in-phase pulse signal ILEAD comprising pulses aligned with edges of the baseband in-phase and quadrature signals when the baseband in-phase signal leads the baseband quadrature signal, and generates a quadrature pulse signal QLEAD comprising pulses aligned with edges of the baseband quadrature and in-phase signals when the baseband quadrature signal leads the baseband in-phase signal. A frequency corrector receives said in-phase and quadrature pulse signals during receipt of said synchronisation sequence, compares the pulse signals to a target, generates a control signal for controlling the local signal generator in dependence upon the result of the comparison. | 09-23-2010 |
| 20100229064 | Wireless Transmission Method and Apparatus - A method of transmitting a data sequence between a sender and a receiver over a wireless link. The method comprises, at the sender, segmenting the data sequence into a plurality of data segments and, for each segment, constructing a frame containing as payload the data segment, transmitting the frame across the wireless link, and receiving an acknowledgement or non-acknowledgement from said receiver for the frame, and only upon receipt of such acknowledgement or non-acknowledgement, retransmitting the frame or transmitting a further frame containing as payload the next data segment. | 09-09-2010 |
| 20100188788 | Electrostatic Discharge Protection Circuit - An integrated circuit having a plurality of circuit blocks, each block having one or more positive voltage supply pads, one or more negative voltage supply pads, and one or more signal pads. The integrated circuit further comprises an electrostatic protection circuit comprising a first electrostatic discharge protection rail for connection to a positive voltage supply point, a second electrostatic discharge protection rail for connection to a negative voltage supply point, and first protection circuitry coupling each said signal pad to both said first and second electrostatic discharge protection rails, the first protection circuitry being configured to provide a conduction path to one of the first and second rings in the event of an excessive voltage being present on one of said signal pads. | 07-29-2010 |
