Cirrus Logic Inc.

Gordon James Bates

John Paul Lesso

Mark McCloy-Stevens

Kapil Sharma

Simon R Foster

Toru Ido

Peter Hsu

Dipankar Nag

David Paul Singleton

John Anthony Breslin

Dario San Martin Molina

The present application relates to current sensing circuitry () that comprises a differential amplifier () comprising first and second inputs configured to sense a current across a sense resistance, and an output configured to output a current sense signal. The circuitry () further comprises a first current source, a second current source and a switch network operable in: a first phase in which the first current source is connected to the first input and disconnected from the output, and the second current source is connected to the output and disconnected from the first input; and a second phase in which the first current source is connected to the output and disconnected from the first input, and the second current source is connected to the first input and disconnected from the output.

Current sensing circuitry

There is described a two-terminal multi-level memristor element synthesised from binary memristors, which is configured to implement a variable resistance based on unary or binary code words. There is further described a circuit such as a synapse circuit implemented using a multi-level memristor element.

Multi-level memristor elements

This application relates to computing circuitry () for analogue computing. A plurality of current generators () are each configured to generate a defined current (I, I, . . . I) based on a respective input data value (D, D, . . . D). A memory array (), having at least one set () of programmable-resistance memory cells (), is arranged to receive the defined currents from each of the current generators at a respective signal line (). Each set () of programmable-resistance memory cells () includes a memory cell associated with each signal line that, in use, can be connected between the relevant signal line and a reference voltage so as to generate a voltage on the signal line. An adder module () is coupled to each of the signal lines to generate a voltage at an output node () based on the sum of the voltages on each of the signal lines.

Computing circuitry

This application relates to methods and apparatus for computing, especially to circuitry for performing computing, at least partly, in the analogue domain. The circuitry () comprises a plurality of memory cells (), each memory cell having first and second paths between an electrode () for receiving an input current and respective positive and negative electrodes () for outputting a differential-current output. Memristors () are located in the first and second paths. The memory cells are configured into sets () of memory cells, the memory cells of each said set being connected so as to provide a differential current set output that corresponds to a combination of the cell outputs of all of the memory cells of that set. For each set, at least some of the memory cells of that set are configured to receive a different input current to other memory cells of that set.

Computing circuitry for configuration and operation of cells and arrays comprising memristor elements

This application relates to methods and apparatus for temperature monitoring for integrated circuits, and in particular to temperature monitoring using a locked-loop circuits, e.g. FLLs, PLLs or DLLs. According to embodiments a locked-loop circuit includes a controlled signal timing module, wherein the timing properties of an output signal (S, S) are dependent on a value of a control signal and on temperature. A controller compares a feedback signal (S) output from the timing module to a reference signal (S) and generates a control signal (S) to maintain a desired timing relationship. A temperature monitor monitors temperature based on the value of the control signal. For FLLs and PLLs the signal timing module may be a controlled oscillator.

Temperature monitoring

This application relates to methods and apparatus for temperature monitoring for integrated circuits, and in particular to temperature monitoring using a locked-loop circuits, e.g. FLLs, PLLs or DLLs. According to embodiments a locked-loop circuit () includes a controlled signal timing module (), wherein the timing properties of an output signal (S, S) are dependent on a value of a control signal and on temperature. A controller () compares a feedback signal (S) output from the timing module to a reference signal (S) and generates a control signal (S) to maintain a desired timing relationship. A temperature monitor () monitors temperature based on the value of the control signal. For FLLs and PLLs the signal timing module may be a controlled oscillator ().

There is disclosed configurable frequency-divider circuitry for generating a target signal of a frequency Fr/Di based on a reference signal of a frequency Fr, where Di is an integer divider ratio, the frequency-divider circuitry comprising: N divider stages organised into a ring, each stage configured to receive an input signal and generate an output signal, with the output signal of each successive stage in the ring being the input signal of the next stage in the ring, wherein: the ring of stages is controlled by the reference signal so that the output signals are governed by the reference signal; the target signal is one of the output signals or a signal derived therefrom; and at least one of the stages is a configurable stage, whose mode of operation is configurable based on a configuration signal to configure the value of Di.

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Edinburgh, United Kingdom

Gordon James Bates