Abstract: Embodiments of circuits, devices, and methods for a power detection arrangement are disclosed. The power detection arrangement may have a coupler coupled with, and in between, a switch and an output to couple a signal to a detector. The power detection arrangement may include a harmonic suppressor coupled with, and in between, the coupler and the detector to reduce an amount of harmonic signals transmitted back to the coupler. Other embodiments may be described and claimed.

Abstract: A system and method for limiting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal are provided. In general, the current in the output stage of the power amplifier circuitry is detected during each transmit burst from the power amplifier circuitry. For each transmit burst, an error correction value for a corresponding power level is determined based on the detected current and a predetermined threshold value. The error correction value is used to correct an adjustable power control signal that controls the power level of the power amplifier circuit for a subsequent transmit burst at the same power level.

Abstract: A system for detecting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal is provided. In general, the mobile terminal includes power amplifier circuitry, power control circuitry, current detection circuitry, and an inductor that essentially prevents radio frequency coupling between the power control circuitry and the power amplifier circuitry. Based on a voltage across the inductor, the current detection circuitry generates a voltage detection signal indicative of a current in the inductor and thus the current in an output stage of the power amplifier.

Abstract: A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes one or more input amplifier stages in series with a final amplifier stage. The power control circuitry provides a variable supply voltage to the input amplifier stages based on an adjustable power control signal. The final amplifier stage is powered by a fixed supply voltage. In operation, as output power of the power amplifier is reduced from its highest power level, the variable supply voltage is reduced. Accordingly, RF power of an amplified signal provided to the final amplifier stage from the input amplifier stages decreases, and the final amplifier stage transitions from saturation to linear operation, thereby increasing the gain of the final amplifier stage. Thus, a desired output level can be maintained while operating at lower current levels.

Abstract: 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 at least one additional amplifier stage coupled in series with the input amplifier stage. The power control circuitry provides a first supply voltage to the input amplifier stage based on a control signal such that the first supply voltage has a predetermined DC offset with respect to the control signal. The first supply voltage is provided such that the predetermined DC offset substantially reduces variations in the AM to PM distortion of the power amplifier due to variations in radio frequency (RF) drive power.

Abstract: A radio frequency (RF) transceiver includes a transmit chain that transmits a transmit signal to an antenna and a receive chain that generates a receive signal from the antenna, wherein the receive chain includes a duplexer and the transmit chain is free of a duplexer. By removing the duplexer from the transmit chain, power losses incurred by the duplexer may be reduced and preferably eliminated from the transmit chain. More specifically, an RF transceiver includes a circulator having first, second and third circulator ports, that circulates power from the first circulator port to the second circulator port, to the third circulator port and then to the first circulator port. An amplifier is coupled to the first circulator port and amplifies a transmit signal. An antenna is coupled to the second circulator port. A duplexer is coupled to the third circulator port and generates a receive signal.

Abstract: A radiotelephone includes front and back housings, a printed circuit board disposed between the housings, and a battery having a pair of terminals secured to the back housing. A pair of fasteners secure the front and back housings together while sandwiching the printed circuit board therebetween and at the same time, provide an electrical connection between the battery terminals and conductive strips formed on the printed circuit board.