Cirrus Logic International Semiconductor Ltd.

United Kingdom

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H03F 1/02 - Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation 1
H04L 25/49 - Transmitting circuits; Receiving circuits using three or more amplitude levels 1
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1.

DATA TRANSFER

      
Document Number 02882321
Status In Force
Filing Date 2012-12-14
Open to Public Date 2013-06-20
Grant Date 2018-05-01
Owner CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD. (United Kingdom)
Inventor
  • Lesso, John Paul
  • Frith, Peter John
  • Pennock, John Laurence

Abstract

This application relates to methods and apparatus for transfer of multiple digital data streams, especially of digital audio data over a single communications link such as a single wire. The application describes audio interface circuitry comprising a pulse- length-modulation(PLM) modulator (204). The PLM is responsive to a plurality of data streams (PDM-R, PDM-L), to generate a seriesof data pulses (PLM)with a single data pulse having a rising and falling edge in each of a plurality of transfer periods defined by a first clock signal (TCLK). The timing of the rising and falling edgeof each data pulse is dependent upon on a combination of the then current data samples from the plurality of data streams. The duration and position of the data pulse in the transfer window in effect defines a data symbol encoding the data. Circuitry for receiving and extracting the data is also disclosed. An interface receives the stream of data pulses (PLM) and data extraction circuitry (202) samplesthe data pulseto determine which of the possible data symbols the pulse representsand determines a data value for at least one received data stream.

IPC Classes  ?

  • H04L 25/49 - Transmitting circuits; Receiving circuits using three or more amplitude levels

2.

AMPLIFIER CIRCUIT

      
Document Number 02711022
Status In Force
Filing Date 2008-08-04
Open to Public Date 2009-02-12
Grant Date 2016-05-10
Owner CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD. (United Kingdom)
Inventor Lesso, John Paul

Abstract

An amplifier circuit comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier; and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal.

IPC Classes  ?

  • H03F 1/02 - Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation