M/a-com Eurotec, B.v.

Ferfics Limited

M/a -com, Inc.

Mia Com Eurotec, B.v.

M/a-com Eurotec

Eugene Heaney

Pierce Joseph Nagle

John O'Sullivan

Andrei V Grebennikov

Finbarr Joseph McGrath

David Philip Burton

Gerard T Quilligan

Herbert Jaeger

Piotr Miroslaw Solski

Andrei Viktorovich Grebennikov

Stephen Kenney

Stephen Keeney

The invention relates to a Radio Frequency System and method. A Radio Frequency (RF) system comprising a RF switch comprising a plurality of transistor switching elements implemented on Silicon on Insulator (SOI) for switching at least one or more RF signals and said SOI comprises a bulk substrate region and a buried oxide region. At least one filter is adapted to isolate the RF signal from the substrate and/or other high frequency signals or control signals present in the RF system. There is also provided a coupling capacitor adapted to cooperate with the filter to improve linearity of the transistor switch elements.

Switching system and method

A power delivery circuit has power delivery components and a load (Z) terminal, detectors for measuring voltages at two or more measuring nodes (V, V) of the power delivery circuit, and an estimation circuit for using the measurements to estimate current, voltage, or power delivered to a load by the power delivery circuit. The detectors may measure voltages at nodes of transistor switches of the power delivery circuit, particularly at the gates. The power delivery circuit may have switches in series, and the detectors measure voltages at nodes of only a subset of the switches. The detectors in one example measure switch voltages and the estimation circuit estimates power delivered to the load according to a switch voltage and impedance between two nodes of the switch. The switch impedance may be provided during calibration using a reference load. The estimation circuit may be a simple analogue circuit such as an amplifier (AMP1) and a multiplexer (MX1). The circuit is of particular benefit for measuring power delivered to a load of unknown impedance, such as an antenna of a mobile phone.

Power delivery circuit with load current estimation based on monitoring nodes not on the power delivery path

Apparatus, methods and articles of manufacture for output impedance matching in multi-band power amplification are provided, wherein an output matching configuration comprising one or more output matching sections, a multi-band diplexer and a switch are connected to an active device.

Apparatus, methods and articles of manufacture for output impedance matching using multi-band signal processing

Apparatus, methods and articles of manufacture for multiband transmitter power amplification are provided wherein one or more amplifying devices, of which at least one may be one or more current sources, have impedances matched for different input and output frequencies by way of various impedance matching circuits.

Apparatus, methods and articles of manufacture for multiband signal processing

An apparatus and method for amplifying a radiofrequency signal using a main Digital to Analog Converter (RFDAC) and a subordinate Digital to Analog Converter (Sub-DAC). The main RFDAC provides a first portion of a N-bit digital output, which specifies the amplification level of the radiofrequency signal, and the sub-DAC provides a second portion of the N-bit digital word. Together, the main RFDAC and the Sub-DAC convert a complete N-bit digital word, where N specifies the resolution of the output radiofrequency signal.

Sub-ranging digital to analog converter for radiofrequency amplification

A transmitter for directly modulating an RF carrier with a complex baseband waveform comprises a programmable device adapted to generate amplitude and phase information collectively corresponding to a complex baseband waveform, a signal generator adapted to generate an RF carrier whose phase is responsive to phase information generated by the programmable device, a plurality of delta modulators, and an amplifier coupled to the signal generator and receiving the RF carrier with phase information. Each delta modulator is operative to sample an error signal at a time period offset from all other delta modulators to thereby generate streams of pulses collectively approximating the amplitude information. The supply voltage of the amplifier is adjusted in accordance with approximated amplitude information represented by the streams of pulses generated by the delta modulators. Specifically, the supply voltage is adjusted such that the output voltage of the amplifier varies substantially linearly with changes in the supply voltage. In this manner, both the amplitude information and the phase information are both impressed upon the RF carrier.

System and method for transmitting digital information using interleaved delta modulation

A power amplifier having a first stage amplifier and a second stage amplifier, each stage of the power amplifier being configured in one of at least two power states based on a desired power output. When the first and second stages are configured in a first state, the power amplifier delivers efficient amplification in a first output power range and, when the first and second stages are configured in a second state, the power amplifier delivers efficient amplification in a second output power range. By configuring each stage in one of at least two states, a high level of power efficiency can be achieved for a broad range of power levels.

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Cork, Ireland

Eugene Heaney