Qorvo Us, Inc.

Rf Micro Devices, Inc.

Freescale Semiconductor,inc.

Motorola Corporation

Qoro Us, Inc.

Nadim Khlat

Marcus Granger-Jones

Michael R Kay

Alexander Wayne Hietala

Philippe Gorisse

Andrew F Folkmann

Ruediger Bauder

Robert Aigner

Christopher Truong Ngo

Jean-Frederic Chiron

James M Retz

Baker P Scott

George Adrian Maxim

Dirk Robert Walter Leipold

David Myara

Manbir Singh Nag

Michael J Murphy

Patrick Clement

Jeffrey D Potts

Terry J Stockert

Jonathan Hale Hammond

David E Reed

Michael F Zybura

Dharma Reddy Kadam

Julio C Costa

Joseph Hubert Colles

Patrick Joseph Pratt

Gernot G Fattinger

Jayanti Jaganatha Rao

Dennis Mahoney

Mohammad Ahsanul Adeeb

Arthur Nguyen

Conor O'Keefe

Chris Ngo

Jeremie Rafin

Kevin Wesley Kobayashi

Scott R Humphreys

Daniel Charles Kerr

Roman Zbigniew Arkiszewski

Joshua James Caron

Stephen Leigh Kuffner

Daniel B Schwartz

William David Southcombe

Wael Al-Qaq

Ricke Waylan Clark

Chong Woo

Christian Rye Iversen

David K Cassetti

Hugues Beaulaton

Eric K Bolton

Edward T Spears

Brian Baxter

Cor Voorwinden

Jacques Trichet

Alex Wayne Hietala

Todd Gillenwater

Mark Alexander John Moffat

Jason Young

Babak Bastani

Jungmin Park

Paul Brey

Adam Toner

Francois Dorel

Eddie Lorenzo-Luaces

Robert Moehrke

Bob Sowell

Milad Zolfagharloo Koohi

Mark Connor

Jean-Blaise Pierres

Phillippe Gorisse

Shanthi Prasad

Karl Francis Horlander

Jordi Mateu

Jérémie Rafin

Carlos Collado Gomez

Alberto Hueltes Escobar

Frank Della Corte

Richard A Summe

Navid Foroudi

Karl F Horlander

The present disclosure relates to a switch system that provides a control method for switches based on dual-phase materials. The disclosed switch system includes a heat resistor, a power management (PM) unit configured to provide a control voltage at a voltage port coupled to the heat resistor, and a phase-change-based switch. Herein, the heat resistor is underneath the phase-change-based switch, and configured to generate heat energy from the control voltage and provide the heat energy to the phase-change-based switch. The phase-change-based switch is capable of being switched on and off by switching between a crystalline phase and an amorphous phase based on the heat energy provided by the heat resistor. The control voltage provided by the PM unit contains waveform information of target heat energy required for switching on and off the phase-change-based switch.

Control method for switches based on dual phase materials

A ferroelectric acoustic resonator structure is provided. The tunable ferroelectric acoustic resonator structure includes a pair of ferroelectric acoustic resonator networks coupled in parallel between a signal input and a signal output. The ferroelectric acoustic resonator networks are tuned by a pair of pulse voltages to resonate in a desired series resonance frequency. However, the pair of pulse voltages can change an equivalent capacitance to therefore cause a parallel resonance frequency of the tunable ferroelectric acoustic resonator structure to shift. Herein, the pair of pulse voltages are determined to cause one of the ferroelectric acoustic resonator networks to increase the equivalent capacitance and to cause another one of the ferroelectric acoustic resonator networks to decrease the equivalent capacitance by an equal amount. As a result, it is possible to keep the overall equivalent capacitance, and therefore the parallel resonance frequency, of the tunable ferroelectric acoustic resonator structure unchanged.

Tunable ferroelectric acoustic resonator structure

Voltage ripple reduction in a power management circuit is disclosed. The power management circuit includes a power amplifier circuit configured to amplify a radio frequency (RF) signal based on a modulated voltage and an envelope tracking integrated circuit (ETIC) configured to provide the modulated voltage to the power amplifier circuit via a conductive path. Notably, an output impedance presenting at an input of the power amplifier circuit can interact with a modulated load current in the power amplifier circuit to create a voltage ripple in the modulated voltage to potentially cause an undesirable error in the RF signal. In this regard, a notch circuit is provided, preferably in the ETIC, to reduce the voltage ripple within a modulation bandwidth of the RF signal. As a result, it is possible to minimize the undesirable error, such as root-mean-square (RMS) error vector magnitude (EVM), within the modulation bandwidth of the RF signal.

Voltage ripple reduction in a power management circuit

The present disclosure relates to filter circuitry, which includes a first node and a second node, a series resonator coupled between the first node and the second node, and a compensation circuit coupled in parallel with the series resonator and located between the first node and the second node. Herein, the compensation circuit includes a tunable acoustic resonator with at least one transduction structure. The at least one transduction structure includes at least one ferroelectric material, and polarization of the at least one ferroelectric material varies with an electric field across the at least one ferroelectric material. Upon adjusting a direct current voltage applied to the tunable acoustic resonator, the compensation circuit is capable of providing a variable negative equivalent capacitance to at least partially cancel out an equivalent capacitance presented by the series resonator between the first node and the second node.

Filter circuitry using ferroelectric tunable acoustic resonator

An acoustic filter providing negative capacitance for use in multiplexers is provided that may include a first resonator and a second resonator. The second resonator may be a three terminal element that includes two sub-resonator elements having opposite polarities that are mechanically coupled such that as one sub-resonator expands, the other contracts. The second resonator may act as a negative capacitance element relative to the first resonator such that the second resonator provides cancelation at specific frequencies. This structure may further reduce the order of an N-multiplexer ladder network and reduce total insertion loss.

Acoustic filters providing negative capacitance for use in multiplexers

Amplitude and phase error correction in a transceiver circuit is provided. In embodiments disclosed herein, a transceiver circuit is configured to equalize an input vector to thereby correct amplitude-amplitude (AM-AM) and amplitude-phase (AM-PM) errors across a modulation bandwidth of the wireless communication circuit. Unlike conventional methods where complicated memory digital predistortion (mDPD) coefficients must be defined and calibrated for each modulation frequency within the modulation bandwidth, the transceiver circuit is configured herein to eliminate modulation frequency dependency of the AM-AM and AM-PM errors. As a result, it is possible to correct the AM-AM and AM-PM errors across the modulation bandwidth with reduced complexity to thereby improve efficiency and linearity of the wireless communication circuit.

Amplitude and phase error correction in a wireless communication circuit

A signal processing apparatus and related transceiver circuit are disclosed. The signal processing apparatus includes a power amplifier circuit and a transceiver circuit. The transceiver circuit is configured to generate multiple composite signals each having a respective one of multiple inverted intermodulation product terms. The power amplifier circuit includes multiple power amplifiers each configured to amplify a respective one of the composite signals. By including the inverted intermodulation product terms in the composite signals prior to amplifying the composite signals, it is possible to offset intermodulation product terms inherently caused by nonlinear responses of the power amplifiers, thus helping to reduce spectrum degradation in the signal processing apparatus.

Signal processing apparatus and related transceiver circuit

Efficiency improvement in a power management integrated circuit (PMIC) is provided. The PMIC includes a voltage modulation circuit configured to generate a modulated voltage, such as an envelope tracking (ET) voltage, for a load circuit and a low-frequency current source configured to provide a low-frequency current to the load circuit. However, since the modulated voltage can be associated with a wide modulation bandwidth that exceeds a bandwidth limitation of the low-frequency current source, the voltage modulation circuit may be forced to source or sink a high-frequency current for the load circuit at an expense of reduced efficiency. In this regard, in embodiments disclosed herein, a high-frequency current source can be activated to source or sink the high-frequency current for the voltage modulation circuit. As a result, the voltage modulation circuit can maintain a higher efficiency across the wide modulation bandwidth.

Efficiency improvement in a power management integrated circuit

Phase and amplitude error correction in a transmission circuit is provided. The transmission circuit includes a transceiver circuit, a power management integrated circuit (PMIC), and a power amplifier circuit(s). The transceiver circuit generates a radio frequency (RF) signal(s) from an input vector, the PMIC generates a modulated voltage, and the power amplifier circuit(s) amplifies the RF signal(s) based on the modulated voltage. When the power amplifier circuit(s) is coupled to an RF front-end circuit, unwanted amplitude-amplitude (AM-AM) and amplitude-phase (AM-PM) errors may be created across a modulation bandwidth of the transmission circuit. In this regard, in embodiments disclosed herein, the input vector is equalized based on multiple complex filters to thereby cause the AM-AM and AM-PM errors to be corrected in the transmission circuit. As a result, it is possible to reduce undesired instantaneous excessive compression and/or spectrum regrowth across the modulation bandwidth of the transmission circuit.

Phase and amplitude error correction in a transmission circuit

Group delay determination in a communication circuit is disclosed. The communication circuit includes a power amplifier circuit that amplifies a radio frequency (RF) signal based on a modulated voltage and a power management integrated circuit (PMIC) that generates the modulated voltage. Herein, the PMIC includes a group delay determination circuit to determine a relative group delay between the modulated voltage and a modulated current, which is internal to the power amplifier circuit and unknown to the PMIC, solely based on signals known to the PMIC. The determined relative group delay can help to time align the modulated voltage with the modulated current at the power amplifier circuit to improve error vector magnitude (EVM) and/or adjacent channel leakage ratio (ACLR). Further, by determining the relative group delay based on known signals to the PMIC, it is possible to achieve good time alignment between the modulated voltage and the modulated current.

Group delay determination in a communication circuit

A power management circuit supporting phase correction in an analog signal with reduced physical pins is disclosed. The power management circuit includes a power amplifier circuit configured to amplify an analog signal having a time-variant power envelope based on a modulated voltage. The power management circuit also includes an envelope tracking integrated circuit (ETIC) configured to generate the modulated voltage and a modulated phase correction voltage to thereby cause a phase change in the analog signal. The ETIC receives a modulated differential signal that includes a common signal and a differential signal and generates the modulated phase correction voltage and the modulated voltage based on the common signal and the differential signal, respectively. By modulating the common signal and the differential signal into the modulated differential signal, it is possible to reduce physical pins in the ETIC to thereby reduce cost and footprint of the power management circuit.

Power management circuit supporting phase correction in an analog signal with reduced physical pins

The present disclosure relates to an amplifier system having an output amplifier stage with a signal input and output, and a varactor with a capacitive output that is coupled to the signal input for adjusting input capacitance. The amplifier system also includes push varactor bias circuitry with a bias level output that is coupled to a tuning input, and a bias control input. The push varactor bias circuitry is configured to adjust bias voltage at the tuning input and thereby adjust the capacitance at the signal input by way of the varactor and reduce signal distortion at the signal output in response to a distortion compensation signal received at the bias control input.

Amplifier system

A multi-voltage power generation circuit is disclosed. More specifically, the multi-voltage generation circuit includes multiple voltage modulation circuits that are configured to generate and maintain multiple modulated voltages. In a non-limiting example, the multiple modulated voltages can be used for amplifying multiple radio frequency (RF) signals concurrently. Contrary to using multiple direct-current (DC) to DC (DC-DC) converters for generating the multiple modulated voltages, the voltage modulation circuits are configured to share a single current modulation circuit based on time-division. By sharing a single current modulation circuit among the multiple voltage modulation circuits, it is possible to concurrently support multiple load circuits (e.g., power amplifier circuits) with significantly reduced footprint.

Multi-voltage generation circuit

A power management circuit supporting phase correction in an analog signal is disclosed. The power management circuit includes a power amplifier circuit configured to amplify an analog signal having a time-variant power envelope based on a modulated voltage. The power management circuit also includes an envelope tracking (ET) integrated circuit (ETIC) configured to generate the modulated voltage and a modulated phase correction voltage to thereby cause a phase change in the analog signal. In embodiments disclosed herein, a correlation between the time-variant power envelope, the modulated voltage, and the modulated phase correction voltage is explored to thereby allow the ETIC to generate the modulated voltage and the modulated phase correction voltage based on the time-variant power envelope. As a result, it is possible to enable good time and phase alignment between the modulated voltage and the time-variant power envelope to thereby improve efficiency and linearity of the power amplifier circuit.

Power management circuit supporting phase correction in an analog signal

A distributed power management circuit is disclosed. Herein, a phase correction in a radio frequency (RF) signal is performed by a power management integrated circuit (PMIC), a distributed PMC, and a power amplifier circuit. The power amplifier circuit includes a phase shifter circuit configured to phase-shift the RF signal based on a phase correction signal and a power amplifier configured to amplify the phase-shifted RF signal based on a modulated voltage. The distributed PMIC is configured to generate the phase correction signal and the modulated voltage based on a modulated target voltage. The PMIC is configured to generate the modulated target voltage based on a time-variant power envelope of the RF signal. As a result, the modulated voltage and the time-variant power envelope can be better aligned in time and/or phase at the power amplifier circuit to thereby improve efficiency and linearity of the power amplifier.

Radio frequency signal phase correction in a distributed power management circuit

Growing community of inventors

Cugnaux, France

Nadim Khlat