Abstract: In accordance with some embodiments of the present disclosure, a control path for a wireless communication device may include a radio frequency coupler having a coupled port and a terminated port, the radio frequency coupler configured to couple at least a portion of a transmission power of a transmission line coupled to the antenna tuner such that the coupled port carries a first signal indicative of an incident power transmitted to an antenna coupled to the antenna tuner and the terminated port carries a second signal indicative of a reflected power reflected by the antenna. the control path may also include a control module configured to communicate the one or more control signals to the antenna tuner for controlling the impedance of the antenna tuner based at least on the first signal and the second signal.

Abstract: An integrated transmit circuit includes a voltage controlled oscillator (702) for generating an input frequency signal (e.g., VCO) that is provided to a divide by two quadrature generator circuit (706) which generates therefrom in-phase and quadrature clocking signals (I, IB, Q, QB) that are applied to control a plurality of transmission gates (711-718) configured in a matched switching topology (710) so as to selectively pass pulses from the input frequency signal, thereby generating interleaved LO pulses (Ø1, Ø1B, . . . Ø4, Ø4B). By applying the interleaved LO pulses to control the transmission gates (26, 28, 30, 32, 34, 36, 38, and 40) in the upmixer (720), the +I, ?I, +Q, ?Q input signals are interleaved over a plurality of phases of a carrier period to produce differential outputs (42, 44).

Abstract: A multi-band RF transmitter circuit (30) for a wireless communication device combines a plurality of RF transmission blocks into a single transceiver integrated circuit which includes a shared broadband SVGA (32), a shared tunable balun (34), and an output switching network (38) at the output of the balun to support three different frequency bands. The outputs of the multi-band RF transmitter circuit are connected to separate external power amplifier circuits (42-44), where each power amplifier circuit generates an amplified signal for one of the plurality of predetermined frequency bands.

Abstract: A multi-band RF transmitter circuit (30) for a wireless communication device combines a plurality of RF transmission blocks into a single transceiver integrated circuit which includes a shared broadband SVGA (32), a shared tunable balun (34), and an output switching network (38) at the output of the balun to support three different frequency bands. The outputs of the multi-band RF transmitter circuit are connected to separate external power amplifier circuits (42-44), where each power amplifier circuit generates an amplified signal for one of the plurality of predetermined frequency bands.

Abstract: An integrated transmit circuit includes a voltage controlled oscillator (702) for generating an input frequency signal (e.g., VCO) that is provided to a divide by two quadrature generator circuit (706) which generates therefrom in-phase and quadrature clocking signals (I, IB, Q, QB) that are applied to control a plurality of transmission gates (711-718) configured in a matched switching topology (710) so as to selectively pass pulses from the input frequency signal, thereby generating interleaved LO pulses (Ø1, Ø1B, . . . Ø4, Ø4B). By applying the interleaved LO pulses to control the transmission gates (26, 28, 30, 32, 34, 36, 38, and 40) in the upmixer (720), the +I, ?I, +Q, ?Q input signals are interleaved over a plurality of phases of a carrier period to produce differential outputs (42, 44).

Abstract: An apparatus and method for dual mode power control. A transmitter is capable of operating in a first mode of operation and a second mode of operation, the first mode of operation and the second mode of operation including a closed loop control mode and an open loop control mode, the first mode of operation being different from the second mode of operation. The transmitter can be operated in the first mode of operation. A transmitter output power characteristic of the first mode of operation can be read back. The transmitter output power characteristic of the first mode of operation can be correlated to a transmitter output power characteristic of the second mode of operation. The first mode of operation can be switched to the second mode of operation based on the transmitter output power characteristic of the second mode of operation.

Abstract: A direct digital synthesizer (DDS) such as a Quantized Interpolated Edge Timed (QuIET) synthesizer is implemented in the feedback path of a translational Phase Lock Loop (PLL). The frequency translation introduced by the synthesizer reduces the amplification of reference feedback path noise sources, thereby enabling a wider loop bandwidth and improving high-pass filtering of phase noise without the addition of a second PLL.

Abstract: A phase rotator for a Cartesian feedback power amplifier in a transmitter final stage contains an integrated voltage controlled tunable resonant circuit accomplishing band-pass filtering at a center frequency selected by local oscillator (LO) coarse trim control signals. The voltage controlled tunable resonant circuit attenuates input signal harmonic levels at large fractional bandwidths for the downconverter in the feedback LO path without setting a large number of poles in the band-pass filter. The binary-weighted course trim value for controlling the gain of the LO sets a bank of voltage-variable capacitors (VVC) in the voltage controlled tunable resonant circuit to control the center frequency in each of two 2-pole band-pass filters, creating a composite 4-pole band-pass filter at the input of a poly-phase quadrature generation circuit in the feedback LO path.

Abstract: A direct digital synthesizer (DDS) such as a Quantized Interpolated Edge Timed (QuIET) synthesizer is implemented in the feedback path of a translational Phase Lock Loop (PLL). The frequency translation introduced by the synthesizer reduces the amplification of reference feedback path noise sources, thereby enabling a wider loop bandwidth and improving high-pass filtering of phase noise without the addition of a second PLL.

Abstract: Systems and methods are described for a sideband suppression technique for quadrature modulation using magnitude measurements. Gain imbalance, phase imbalance, or both gain and phase imbalance are corrected in a quadrature modulator. Predetermined voltage levels are applied to one or both of the quadrature modulator input channels and resultant output magnitudes are measured. Then, a gain correction factor, a phase correction factor or both gain and a phase correction factors are determined as a function of the measured output magnitudes. Gain imbalance, phase imbalance or both gain and imbalance are then corrected using the gain and phase correction factors.

Abstract: Systems and methods are described for a sideband suppression technique for quadrature modulation using magnitude measurements. Gain imbalance, phase imbalance, or both gain and phase imbalance are corrected in a quadrature modulator. Predetermined voltage levels are applied to one or both of the quadrature modulator input channels and resultant output magnitudes are measured. Then, a gain correction factor, a phase correction factor or both gain and a phase correction factors are determined as a function of the measured output magnitudes. Gain imbalance, phase imbalance or both gain and imbalance are then corrected using the gain and phase correction factors.