Assignee: Cirrus Logic, Inc.

Location: Not specified.
No. of patents: 55

Number	Title	Issue Date
6556157	Frequency detect circuit for determining sample speed mode of decoded audio input data streams Disclosed is a data converter and a method for converting a digital audio stream representing an analog signal that has been sampled at a certain rate. The circuit includes a divider that receives a clock signal associated with the digital audio stream an...	04/29/2003
6515540	High order multi-path operational amplifier with output saturation recovery An amplifier is disclosed including multiple integrator stages. The amplifier includes a low-frequency path from a signal input to a signal output and relatively higher-frequency bypass paths around the first integrator stage. The paths converge at a summ...	02/04/2003
6509790	Switched-capacitor circuits and methods with improved settling time and systems using the same A switched capacitor circuit (300) including an operational amplifier (206) having an input and an output, a sampling capacitor (203) and a set of switches (204, 205, 301, and 302) are disclosed. During a first phase, switches (201, 204) sample an input v...	01/21/2003
6489901	Variable duty cycle resampling circuits and methods and sample rate converters using the same A sample rate converter 210, 209 includes a filter 210 for processing digital data in response to a clock controlled by a clock enable signal, the filter 210 receiving the digital data at a first sampling rate and outputting digital data at a second sampl...	12/03/2002
6490332	High speed, low-power shift register and circuits and methods using the same A shift register includes a plurality of shift register stages having inputs and outputs coupled to form a chain. Each stage includes enable and disable control inputs, with an output of a selected one of the stages coupled to the enable input of a stage ...	12/03/2002
6473021	Analog to digital conversion circuits, systems and methods with gain scaling switched-capacitor array A method of gain scaling in a charge redistribution analog to digital converter includes the step of segmenting a bit weighted capacitor array into a first segment having at least one capacitor representing a least significant bit and a second segment hav...	10/29/2002
6466091	High order multi-path operational amplifier with reduced input referred offset Disclosed in this application is the placement of an additional integrator between the first stage integrator output and the input to the attenuator/low pass filter. This approach reduces the input referred offset by a factor equal to the gain of the addi...	10/15/2002
6466528	Flexible interface signal for use in an optical disk system and systems and methods using the same An interface 400 for interfacing an optical pickup 101 is associated with processing circuitry 100. A plurality of inputs receive data retrieved from an optical disk by the pickup and 401, 402, 403 are each coupled to a corresponding one of the inputs and...	10/15/2002
6463271	Portable radio telephone data terminal using cdpd A portable radio telephone handset includes the capability of operating as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation are available in the handset, an analog cellular communication mode and ...	10/08/2002
6448911	Circuits and methods for linearizing capacitor calibration and systems using the same A switched capacitor circuit includes a plurality of capacitor arrays coupled to a node, including an input array, a trim array associated with a selected capacitor of the input array and an offset compensation array. A first plurality of switches selecti...	09/10/2002
6445791	System and methods for modem interface An interface for coupling a modem port with a transmission line includes a hybrid converter having a variable gain amplifier coupling a transmit path of a first differential polarity and a received path of a second differential polarity....	09/03/2002
6434213	Low-power low-area shift register A low power, low area shift register permits control over delay by dividing the shift register cells into a plurality of segments that are serially connected. A first selector provides data from a shift register input selectively to an input of one of the...	08/13/2002
6418110	Optical disk pickup system using current division signal transmission and methods and optical disk systems using the same An optical disk pickup system 400 using current mode signal transmission is disclosed. An operational amplifier 404 has an input for receiving an electrical signal and a feedback loop including a current path of a first transistor 405 of a first size, tra...	07/09/2002
6412061	Dynamic pipelines with reusable logic elements controlled by a set of multiplexers for pipeline stage selection A method of dynamically adjusting a multiple stage pipeline to execute one of a set of instructions, wherein each stage has a latency and performs a selected data operation. An instruction to be executed is received and a number of stages of the pipeline ...	06/25/2002
6405093	Signal amplitude control circuitry and methods Amplitude control circuitry 5000 includes a first register 5001 for storing received amplitude control data and a second register 5002 for storing amplitude control data transfered from first register 5001. Output circuitry 5005, 5006, 5007 controls the a...	06/11/2002
6385704	Accessing shared memory using token bit held by default by a single processor A method of operating shared memory in a multiple processor system. A token is by default maintained with a first processor, the token enabling access to shared memory. A determination is made that a second processor requires access to shared memory. A de...	05/07/2002
6380805	Operational amplifier with multiple complementary P-channel and N-channel input pairs to reduce transconductance variation In accordance with the present invention complementary P-channel and N-channel input pairs of transistors form in an op amp. Two sets of such pairs are provided so that a transconductance range of each set of pairs is different. By combining the outputs o...	04/30/2002
6373954	Single-chip audio circuitry, method, and systems using the same A single chip audio system 100 includes a bus interface 101, digital to analog converters 110, an analog mixer 115, and analog spatial enhancement circuitry 7500. Digital to analog converters 110 convert digital audio data received through bus interface 1...	04/16/2002
6369661	Phase interpolation circuits and methods and systems using the same A signal generator 600 includes oscillator circuitry for generating first and second signals having a selected phase relationship and an interpolator 610 for interpolating between a phase of the first signal and a phase of the second signal to generate a ...	04/09/2002
6359315	Circuits for controlling a bidirectional terminal and systems using the same Circuitry 400 for controlling a bidirectional terminal includes an output transistor 405 for selectively coupling the bidirectional terminal to a voltage rail, output transistor 405 turning on when a voltage at a control node falls below a preselected thr...	03/19/2002
6356871	Methods and circuits for synchronizing streaming data and systems using the same A method for synchronizing stream processing with a locally generated system time clock is disclosed. A program clock reference is recovered from a transport layer and used to vary the frequency of the locally generated system time clock. A presentation t...	03/12/2002
6349285	Audio bass management methods and circuits and systems using the same A method of managing multiple channels of audio data in an audio system having multiple speakers. A first channel signal is selectively passed through a software high-pass filter to selectively drive a first one of the speakers. A plurality of channel sig...	02/19/2002
6340940	Digital to analog conversion circuits and methods utilizing single-bit delta-SIGMA modulators and multiple-bit digital to analog converters A digital to analog converter re-codes a stream of 1-bit digital data into a stream of multiple-bit data with a gain greater than one. The resulting stream of multiple-bit data is then converted into analog form in a multiple-bit digital to analog convert...	01/22/2002
6316991	Out-of-calibration circuits and methods and systems using the same A voltage out-of-calibration detector 200 includes a voltage divider operating between first and second voltage rails and having a plurality of taps 203 for generating first and second comparison voltages. A first set of switches 205 selectively couples a...	11/13/2001
6314330	Single-chip audio system power reduction circuitry and methods An audio system 100 includes digital-to-analog converters 110 having left and right paths for converting received left and right streams of digital audio data and a plurality of analog data ports for receiving left and right channel streams of analog audi...	11/06/2001
6304751	Circuits, systems and methods for digital correction of phase and magnitude errors in image reject mixers Imager rejection circuitry includes a first digital path including a finite impulse response filter 202 having a variable gain stage 204 operable to apply a gain to a first digital signal in response to a coefficient selected from a coefficient table 206 ...	10/16/2001
6301366	Single-chip audio system mixing circuitry and methods An audio system 100 disposed on a single chip includes an output mixer 115 having inputs for receiving first digital audio data of a first bit width from a first digital-to-analog converter 110, digital audio data of a second bit width from a second digit...	10/09/2001
6265859	Current mirroring circuitry and method A current mirror 100 includes a current mirroring transistor 103 having a selected aspect ratio for conducting a mirrored current of a selected mirroring ratio with respect to a reference current. A plurality of reference current transistors 201 are dispo...	07/24/2001
6259957	Circuits and methods for implementing audio Codecs and systems using the same Audio data processing circuitry 300 includes a plurality of analog inputs 101 for receiving analog audio data and a digital input 105 for receiving digital audio data. A analog mixer 312 mixes analog data received at said plurality of analog inputs 101 to...	07/10/2001
6255975	Circuits and methods for noise filtering in 1-bit audio applications and systems using the same A digital to analog converter 102 receives a data stream at a first over-sampling rate and quantizes a second data stream derived from that stream at a second, higher oversampling rate for reducing out-of-band quantization noise in an analog output of the...	07/03/2001
6253293	Methods for processing audio information in a multiple processor audio decoder A method of processing a stream of audio information received by a multiple processor audio decoder. Processing operations are performed by a first processor on the stream of audio information to produce at set of results. The first processor writes the s...	06/26/2001
6205223	Input data format autodetection systems and methods A method of automatically detecting a data format type of a stream of data. A determination is made as to whether a current word and a previously received words comprise a set of identifiers associated with a selected type of data. When a preselected numb...	03/20/2001
6172361	Methods for mounting an imager to a support structure and circuitry and systems embodying the same The method of mounting a semiconductor device 200 on a supporting structure 101, the semiconductor device having a surface 201 including a defined area 202 for receiving photons and a plurality of conductors 203/204 for establishing connections to the dev...	01/09/2001
6167498	Circuits systems and methods for managing data requests between memory subsystems operating in response to multiple address formats A process and implementing computer system in which a graphics subsystem 117 having an XY coordinate addressing system interfaces with a host computer system having a linear addressing configuration. The subsystem includes an internal graphics engine 325....	12/26/2000
6157366	Circuits, systems and methods for graphics and video window/display data block transfer via dedicated memory control Display control circuitry is provided which includes a frame buffer 104 having a plurality of memory spaces 301 each for storing a block of display data. Circuitry 200 is provided for generating display position data representing a position on a display s...	12/05/2000
6147522	Reference voltage circuitry for use in switched-capacitor applications Circuitry for selectively sampling a reference voltage with a capacitor 403 includes a first switch 505a for selectively coupling capacitor 403 to a source of a first reference signal during a first operating phase and a second switch 505b for selectively...	11/14/2000
6145007	Interprocessor communication circuitry and methods A method of exchanging messages between first and second processors. A pending flag in a first register is polled by the first processor and if the flag is in a first selected logic state, a message is written into a second register with the first process...	11/07/2000
6121949	Method and apparatus for automatically maintaining a predetermined image quality in a display system A display system in a computer or multimedia system maintains a predetermined image quality. The display system includes an intelligent display driver controller (IDDC), a serial PROM, display screen, and sensors. The IDDC controls display of input image ...	09/19/2000
6118461	Circuits, systems and methods for memory mapping and display control systems using the same A processing system 100 is disclosed which includes a system master 101, a system bus 102 coupled to the master, and a plurality of bus interface circuits 106 coupled to bus 102. A first one of the bus interfaces 106 includes a mapping signal input couple...	09/12/2000
6101598	Methods for debugging a multiprocessor system A method of operating a multiple processor device. A first word of a sequence of words is received in a register. A target processor is determined from the first word and the target processor is interrupted. An input ready bit is set and first word from i...	08/08/2000

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Assignee: Cirrus Logic, Inc.