Silicon Laboratories Inc.

Nxp B.v.

Cirrus Logic Inc.

St-ericsson Sa

Silacon Laboratories Inc.

G Tyson Tuttle

Donald A Kerth

Vishnu Shankar Srinivasan

Richard T Behrens

G Diwakar Vishakhadatta

Jeffrey William Scott

Dan Bernard Kasha

Tod Paulus

Gregory A Hodgson

Augusto Manuel Marques

Lysander Lim

David R Welland

Caiyi Wang

Scott Willingham

Mark S Spurbeck

James P Maligeorgos

Aslamali A Rafi

Peter Vancorenland

Wade Robert Gillham

Gregory Takeo Uehara

Alessandro Piovaccari

Dylan Alexander Hester

Scott Thomas Haban

Eric R Garlepp

Navdeep S Sooch

Mustafa H Koroglu

David E Reed

Jerrell P Hein

Javier Elenes

Russell Croman

Dana John Taipale

Gerald D Champagne

Chunyu Xin

Murthy R Mellachurvu

Gary B Levy

Brett O Mitchelson

Allessandro Piovaccari

In one aspect, the present invention includes an apparatus having a digital signal processor (DSP), a controller coupled to the DSP to provide control signals to the DSP, and a one-time programmable (OTP) memory coupled to the DSP and the controller. The OTP memory may include multiple code portions including a first code block to control the DSP and a second code block to control the controller.

Digital architecture using one-time programmable (OTP) memory

Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.

Partitioned radio-frequency apparatus and associated methods

An integrated low-IF (low intermediate frequency) terrestrial broadcast receiver and associated method are disclosed that provide an advantageous and cost-efficient solution. The integrated receiver includes a mixer, local oscillator generation circuitry, low-IF conversion circuitry, and DSP circuitry. And the integrated receiver is particularly suited for small, portable devices and the reception of terrestrial audio broadcasts, such as FM and AM terrestrial audio broadcast, in such portable devices.

Integrated low-IF terrestrial audio broadcast receiver and associated method

A radio-frequency apparatus includes an integrated circuit. The integrated circuit includes receiver analog circuitry, receiver digital circuitry, a digital-to-analog converter, and a signal selector. The receiver analog circuitry receives radio-frequency signals, and provides a first digital signal. The receiver digital circuitry receives the first digital signal, and provides a second digital signal. The digital-to-analog converter converts the second digital signal into a first analog signal. The signal selector receives the second digital signal and the first analog signal, and selectively provides one of the second digital signal and the first analog signal as an output signal of the integrated circuit.

Radio-frequency apparatus and associated methods

In one embodiment, the present invention includes an amplifier having a transistor stage coupled between a supply voltage and a bias current. The transistor stage has an input to receive a radio frequency (RF) input signal obtained from an antenna. The amplifier has an input impedance that is unmatched to a source impedance of the antenna. In some embodiments, this unmatched input impedance may be substantially greater than the source impedance, and may further be controlled based on a strength of the RF input signal.

Low noise amplifier for a radio receiver

Integrated low-IF (low intermediate frequency) data receivers and associated methods are disclosed that provide advantageous and cost-efficient solutions.

Low-IF integrated data receiver and associated methods

A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry. The receiver analog circuitry resides within a first integrated circuit and the receiver digital circuitry resides within a second integrated circuit. The second integrated circuit couples to the first integrated circuit via a one-bit digital interface. The receiver analog circuitry receives an RF signal and processes the received RF signal to generate a digital signal. The receiver analog circuitry provides the digital signal to the receiver digital circuitry. The receiver digital circuitry includes a digital down-converter circuitry that mixes the digital signal with an intermediate frequency (IF) local oscillator (LO) signal to generate a digital down-converted signal. The receiver digital circuitry also includes a digital filter circuitry that filters the digital down-converted signal to generate a filtered digital signal.

Digital architecture for radio-frequency apparatus and associated methods

In one embodiment, the present invention includes an amplifier having an input to receive a radio frequency (RF) signal from an output node of a source. An input stage coupled to the amplifier input may include one or more components to aid in processing of incoming signals. One such component coupled between the source and the input of the amplifier is a coupling capacitor used to maintain a bias voltage of the amplifier at a different potential than a DC voltage of the output node. In certain applications, the amplifier and the coupling capacitor may be integrated on a single substrate.

Input stage for an amplifier

Receiver architectures and related methods are disclosed for high definition (HD) and digital radio FM broadcast receivers. The radio receiver architectures are configured to utilize multiple analog-to-digital converters (ADCs) to handle the digital radio spectrum and can be configured to modify a target IF frequencies depending upon the mode of operation of the receiver. For example, the receiver can include an analog FM reception mode and a digital FM reception mode for which different down-conversions are used for the same analog-plus-digital audio broadcast channel. If desired, the radio broadcast receivers disclosed can be configured so that they only receive digital FM radio content, for example, if the analog FM broadcast was of no interest and/or if the broadcast was all digital.

Receiver architectures for digital radio broadcasts and associated methods

An apparatus includes processor and a control interface. The processor is adapted to in a first mode of operation, operate as part of one of a wireless receiver and a wireless transmitter and in a second mode of operation. The processor also processes a first audio band signal to generate a second audio band signal. The control interface selects one of the first and second modes of operation.

Broadcast AM receiver, FM receiver and/or FM transmitter with integrated stereo audio codec, headphone drivers and/or speaker drivers

In one embodiment, the present invention includes a method for digitizing a phase noise value indicative of a level of phase noise present in a LO signal and downconverting an RF signal to a second frequency signal using the LO signal. This downconversion can cause the phase noise to be transferred to the second frequency signal. The method may thus further include removing the phase noise from the second frequency signal using the digitized phase noise value.

Correcting for phase noise of an oscillator

Integrated low-if terrestrial audio broadcast receiver and associated method

Growing community of inventors

Austin, TX, United States of America

G Tyson Tuttle