1
David Dening: DC-DC converter with reduced electromagnetic interference. RF Micro Devices, Withrow & Terranova PLLC, November 29, 2005: US06969978 (145 worldwide citation)

A DC-DC converter includes a variable frequency oscillator, a control system and a power train. The DC-DC converter is well suited for use in a cell phone. The control system uses the output of the oscillator to control the power train. The oscillator varies its frequency as a function of a pseudo r ...


2
Jason Young, Dennis Mahoney, Ricke W Clark, Nadim Khlat, Adam Toner: N-th order curve fit for power calibration in a mobile terminal. RF Micro Devices, Withrow & Terranova P L L C, May 5, 2009: US07529523 (120 worldwide citation)

A method for calibrating the output power of a mobile terminal using at least a second order curve fit to describe a power amplifier gain (PAG) setting versus output power characteristic of a power amplifier in a transmitter of the mobile terminal is provided. For each of an upper-band frequency, a ...


3
David Q Ngo, Mike B Thomas, Christopher B Foye: Switched gain amplifier circuit. RF Micro Devices, Withrow & Terranova PLLC, April 20, 2004: US06724252 (115 worldwide citation)

An amplifier chain that switches between a saturated mode of operation and a linear mode of operation comprises at least two amplifier stages. A switch is associated with the first amplifier stage and dampens the gain of the amplifier chain when the switch is closed. In a first embodiment, this is d ...


4
Michael R Kay: Active ripple reduction switched mode power supplies. RF Micro Devices, Withrow & Terranova PLLC, June 19, 2007: US07233130 (99 worldwide citation)

A system and method are provided for actively reducing ripple in a supply voltage provided by a switched mode power supply. In general, active ripple reduction circuitry operates to sense the ripple in the supply voltage to provide a signal indicative of the ripple. The signal indicative of the ripp ...


5
William J Pratt: HBT power amplifier. RF Micro Devices, Rhodes Coats & Bennett L, May 13, 1997: US05629648 (91 worldwide citation)

An improved heterojunction bipolar transistor power amplifier circuit providing an efficient and linear amplifier comprising: a first heterojunction bipolar transistor (HBT) having a base emitter voltage; a power supply; a power supply resistor connected to the power supply causing DC current to flo ...


6
Darrell Epperson, Leendert Quist: Power amplifier control. RF Micro Devices, Winthrow & Terranova PLLC, March 2, 2004: US06701138 (89 worldwide citation)

The present invention provides for power amplifier control of amplifier circuitry including an input stage and one or more output stages. The input stage is powered separately from the output stage by a relatively fixed power source. The one or more output stages are supplied with power via a voltag ...


7
Chris Levesque, William David Southcombe, David E Jones, Scott Yoder, Terry J Stockert: Charge pump based power amplifier envelope power supply and bias power supply. RF Micro Devices, Withrow & Terranova P L L C, September 24, 2013: US08542061 (79 worldwide citation)

The present disclosure relates to a direct current (DC)-DC converter, which includes a charge pump based radio frequency (RF) power amplifier (PA) envelope power supply and a charge pump based PA bias power supply. The DC-DC converter is coupled between RF PA circuitry and a DC power supply, such as ...


8
Nadim Khlat: Power control loop using a tunable antenna matching circuit. RF Micro Devices, Withrow & Terranova P L L C, November 27, 2012: US08320850 (77 worldwide citation)

The present disclosure relates to combining tunable antenna matching circuit adjustments and RF power amplifier output power adjustments of a first RF terminal in response to output power adjustment commands received from a second RF terminal. The output power adjustment commands may be part of an o ...


9
Nadim Khlat, Ruediger Bauder: Power control system for a continuous time mobile transmitter. RF Micro Devices, Withrow & Terranova P L L C, August 10, 2010: US07773691 (73 worldwide citation)

Power control circuitry is provided for controlling an output power of a transmitter of a mobile terminal operating according to a continuous time transmit scheme such as Wideband Code Division Multiple Access (WCDMA). Transmit circuitry processes a quadrature baseband signal to provide a radio freq ...


10
Darrell G Epperson, Ryan Bosley: Tailored collector voltage to minimize variation in AM to PM distortion in a power amplifier. RF Micro Devices, Withrow & Terranova PLLC, September 19, 2006: US07109791 (71 worldwide citation)

A system is provided for substantially reducing variation in AM to PM distortion of a power amplifier caused by variations in RF drive power and temperature. The system includes power control circuitry and power amplifier circuitry. The power amplifier circuitry includes an input amplifier stage and ...



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