Abstract: A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.

Abstract: A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.

Abstract: Control systems and methods for power amplifiers operating in envelope tracking mode are presented. A set of corresponding functions and modules are described and various possible system configurations using such functions and modules are presented.

Abstract: Optimization methods via various circuital arrangements for amplifier with variable supply power are presented. In one embodiment, a switch can be controlled to include or exclude a feedback network in a feedback path to the amplifier to adjust a response of the amplifier dependent on a region of operation of the amplifier arrangement (e.g. linear region or compression region).

Abstract: Methods and systems for reducing parasitic loading on a power supply output in RF amplifier arrangements used in multiband and/or multitude RF circuits are presented. Such RF circuits can comprise a plurality of RF amplifiers of which only one is activated for a given desired transmission mode and/or band.

Abstract: Various methods and circuital arrangements for biasing one or more gates of stacked transistors of an amplifier are presented, where the amplifier can be an envelope tracking amplifier. Circuital arrangements to generate reference gate-to-source voltages for biasing of the gates of the transistors of the stack are also presented. Particular biasing for a case of an input transistor of the stack is also presented.

Abstract: A transistor switch that provides isolation is described. The transistor switch is adapted to receive an input signal at an input terminal and either transmit the input signal to an output terminal when the transistor switch is in a first state or ground the input signal when the transistor switch is in a second state. The transistor switch comprises series switches, which couple the input terminal to the output terminal when the transistor switch is in the first state; shunt switches, which couple the input terminal to ground when the transistor switch is in the second state; and filters to provide isolation between the input terminal and the output terminal.

Abstract: Various envelope tracking amplifiers are presented that can be switched between an ET (envelope tracking) mode and a non-ET mode. Switches and/or tunable components are utilized in constructing the envelope tracking amplifiers that can be switched between the ET mode and the non-ET mode.

Abstract: Methods and systems for reducing parasitic loading on a power supply output in RF amplifier arrangements used in multiband and/or multitude RF circuits are presented. Such RF circuits can comprise a plurality of RF amplifiers of which only one is activated for a given desired transmission mode and/or band.

Abstract: A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.

Abstract: Various envelope tracking amplifiers are presented that can be switched between an ET (envelope tracking) mode and a non-ET mode. Switches and/or tunable components are utilized in constructing the envelope tracking amplifiers that can be switched between the ET mode and the non-ET mode.

Abstract: A transistor switch that provides isolation is described. The transistor switch is adapted to receive an input signal at an input terminal and either transmit the input signal to an output terminal when the transistor switch is in a first state or ground the input signal when the transistor switch is in a second state. The transistor switch comprises series switches, which couple the input terminal to the output terminal when the transistor switch is in the first state; shunt switches, which couple the input terminal to ground when the transistor switch is in the second state; and filters to provide isolation between the input terminal and the output terminal.

Abstract: Driver circuits and methods related thereto for driving high power and/or high frequency devices are described. The driver circuits comprise transistor stacks and capacitors coupled with the transistor stacks. Voltages across the capacitors depend on state (on or off) of each transistor in the transistor stacks. These voltages in turn determine output voltages generated by the driver circuits.

Abstract: A method and apparatus for wirelessly transmitting data between two devices (101. 102) is provided herein. During data transmission, a data and a strobe signal are transmitted simultaneously on the I and Q-channels, respectively, of over-the-air interface. More particularly, QPSK modulation is utilized, with the strobe signal being transmitted via the I-channel, and the data signal being transmitted via the Q channel, (or vice versa). Additionally, illegal constellation transitions are utilized to signal the transmission of control information.

Abstract: A charge pump (140) having a differential current amplifier with a current source (151) that sources output current (155) in response to a first bias point (141), and a current sink (152) that sinks current in response to a second bias point (142) is provided. The charge pump includes a first level translator (131) that monitors a high range of an output voltage (156) of the differential current amplifier and self-adjusts the first bias point to extend the output voltage to a higher range, and a second level translator (132) that monitors a low range of the output voltage of and self-adjusts the second bias point to extend the output voltage to a lower range. The charge pump keeps the output current constant between the higher range and the lower range. A sensing transistor increases an output impedance of the differential current amplifier and reduces output loading.

Abstract: A charge pump (140) having a differential current amplifier with a current source (151) that sources output current (155) in response to a first bias point (141), and a current sink (152) that sinks current in response to a second bias point (142) is provided. The charge pump includes a first level translator (131) that monitors a high range of an output voltage (156) of the differential current amplifier and self-adjusts the first bias point to extend the output voltage to a higher range, and a second level translator (132) that monitors a low range of the output voltage of and self-adjusts the second bias point to extend the output voltage to a lower range. The charge pump keeps the output current constant between the higher range and the lower range. A sensing transistor increases an output impedance of the differential current amplifier and reduces output loading.

Abstract: A doubly balanced transceiver system having a transmit terminal (TX), a receive terminal (RX), and an an antenna terminal (ANTENNA), 180° hybrids (201, 240), 90° hybrids (204, 304, 235 and 335), a power amplifier (230, 330) and a RX/TX switch (220) for disabling the power amplifier so that signals received at the transmitter are reflected to the receive terminal (RX). The 180° hybrids (201, 240) preferably split and re-combine signals into parallel paths. A loopback test mode is preferably provided by use of an antenna isolation switch (302) to enable a power detect terminal (POWER_DETECT). This eliminates pricey and problematic GaAs switches, and allows the use of low cost silicon for the power amplifier. The doubly balance architecture also has the advantage of eliminating common-mode noise, and reflection problems with the PA gain stages. Additionally, greater power can be extracted from the power amplifier. Further the arrangement has less insertion loss compared to a GaAs switch.

Abstract: A method and apparatus for wirelessly transmitting data between two devices (101, 102) is provided herein. During data transmission, a data and a strobe signal are transmitted simultaneously on the I and Q-channels, respectively, of over-the-air interface. More particularly, QPSK modulation is utilized, with the strobe signal being transmitted via the I-channel, and the data signal being transmitted via the Q channel, (or vice versa). Additionally, illegal constellation transitions are utilized to signal the transmission of control information.

Abstract: A doubly balanced transceiver system having a transmit terminal (TX), a receive terminal (RX), and an an antenna terminal (ANTENNA), 180° hybrids (201, 240), 90° hybrids (204, 304, 235 and 335), a power amplifier (230, 330) and a RX/TX switch (220) for disabling the power amplifier so that signals received at the transmitter are reflected to the receive terminal (RX). The 180° hybrids (201, 240) preferably split and re-combine signals into parallel paths. A loopback test mode is preferably provided by use of an antenna isolation switch (302) to enable a power detect terminal (POWER_DETECT). This eliminates pricey and problematic GaAs switches, and allows the use of low cost silicon for the power amplifier. The doubly balance architecture also has the advantage of eliminating common-mode noise, and reflection problems with the PA gain stages. Additionally, greater power can be extracted from the power amplifier. Further the arrangement has less insertion loss compared to a GaAs switch.

Abstract: A cavity filter (15) includes a dielectric block (25) disposed adjacent to a conductive layer (23) for producing a resonant frequency of the cavity filter. An electromagnetic signal (VA) propagates within the dielectric block for a predetermined distance to a surface (58) of the conductive layer, where the predetermined distance is one-fourth of a wavelength of the electromagnetic signal at the resonant frequency.