Abstract: In one embodiment, an apparatus includes: a receiver pad to receive an incoming radio frequency (RF) signal; a first inductor coupled to the receiver pad; a second inductor coupled to the first inductor at an inter-inductor node; a first electrostatic discharge (ESD) circuit coupled to the inter-inductor node; a second ESD circuit coupled to the second inductor; a low noise amplifier (LNA) coupled to the second inductor to receive and amplify the incoming RF signal; a transmit-receive (TR) switch coupled to the LNA, where in a receive mode, the TR switch is to enable the LNA to receive the incoming RF signal; a transmit pad to output an outgoing RF signal; and a power amplifier (PA) coupled to the transmit pad, where in a transmit mode, the TR switch is to decouple the LNA.

Abstract: A transmitter of a wireless communications system includes a digital-to-analog converter (DAC), a baseband filter, and a mixer configured in a stacked circuit between power supply nodes. By stacking those three circuit stages, current-mode signals are used without conversion of intermediate signals into voltage-mode signals. Accordingly, the stacked circuit has a compact structure that reuses bias currents, thereby reducing power consumption and integrated circuit area as compared to embodiments using a serial circuit configuration. The stacked circuit establishes a steady direct current (DC) bias signal at the terminals of transistors of a current-steering DAC that processes time-varying alternating current (AC) signals and reuses that DC bias current to establish a steady DC bias current at the terminals of transistors of the mixer circuit. The stacked circuit can be used in constant envelope modulation applications or in variable envelope modulation applications.

Abstract: In one aspect, an apparatus includes a power amplifier comprising a plurality of slices configurable to: amplify a first radio frequency (RF) signal of a first wireless protocol according to a linear mode of operation; and amplify a second RF signal of a second wireless protocol according to a non-linear mode of operation. The apparatus further includes a programmable impedance circuit coupled to an output of the power amplifier, where the programmable impedance circuit is to be controlled based on a power level of the power amplifier.

Abstract: In one aspect, an apparatus includes: a dual-mode power amplifier to amplify a first radio frequency (RF) signal of a first wireless protocol according to a linear mode of operation, and to amplify a second RF signal of a second wireless protocol according to a non-linear mode of operation; at least one digital feedback circuit coupled to the power amplifier, the at least one digital feedback circuit to provide feedback information; and a controller to control a power level of the dual-mode power amplifier based at least in part on the feedback information.

Abstract: In one embodiment, an apparatus includes: a wake-up radio to issue a trigger signal in response to detection of a wake-up message in a radio frequency (RF) signal; and a second radio coupled to the wake-up radio, the second radio to wake up in response to receipt of the trigger signal. The wake-up radio may be coupled to the second radio without substantial loading, and may be configured with stacked circuits to reuse currents.

Abstract: In one embodiment, an apparatus includes a baseband processor to generate a baseband signal and a digital pre-distortion (DPD) circuit to pre-distort the baseband signal with compensation information obtained from a lookup table. The lookup table may have a plurality of entries each to store a pre-distortion value, the lookup table to be addressed based on a target output power level of the baseband signal. The apparatus also may include a converter to convert the pre-distorted baseband signal to an analog signal and radio frequency (RF) circuitry comprising: a mixer to upconvert the analog signal to a pre-distorted RF signal, and a power amplifier to amplify the pre-distorted RF signal.

Abstract: In one aspect, an apparatus comprises: a driver circuit to receive first and second ramp signals and output first and second drive signals under control of a first bias signal and a second bias signal, the first bias signal having a first edge and a second edge, the second edge having a different edge rate than the first edge, the second bias signal having a third edge and a fourth edge, the third edge having a different edge rate than the fourth edge; and an output circuit coupled to the driver circuit, the output circuit comprising at least one first active device to be driven by the first drive signal and at least one second active device to be driven by the second drive signal, where the output circuit is to amplify and output a radio frequency (RF) signal.

Abstract: In one embodiment, an apparatus includes: a receiver pad to receive an incoming radio frequency (RF) signal; a first inductor coupled to the receiver pad; a second inductor coupled to the first inductor at an inter-inductor node; a first electrostatic discharge (ESD) circuit coupled to the inter-inductor node; a second ESD circuit coupled to the second inductor; a low noise amplifier (LNA) coupled to the second inductor to receive and amplify the incoming RF signal; a transmit-receive (TR) switch coupled to the LNA, where in a receive mode, the TR switch is to enable the LNA to receive the incoming RF signal; a transmit pad to output an outgoing RF signal; and a power amplifier (PA) coupled to the transmit pad, where in a transmit mode, the TR switch is to decouple the LNA.

Abstract: In one embodiment, an apparatus includes: a wake-up radio to issue a trigger signal in response to detection of a wake-up message in a radio frequency (RF) signal; and a second radio coupled to the wake-up radio, the second radio to wake up in response to receipt of the trigger signal. The wake-up radio may be coupled to the second radio without substantial loading, and may be configured with stacked circuits to reuse currents.

Abstract: In one aspect, an apparatus comprises: a driver circuit to receive first and second ramp signals and output first and second drive signals under control of a first bias signal and a second bias signal, the first bias signal having a first edge and a second edge, the second edge having a different edge rate than the first edge, the second bias signal having a third edge and a fourth edge, the third edge having a different edge rate than the fourth edge; and an output circuit coupled to the driver circuit, the output circuit comprising at least one first active device to be driven by the first drive signal and at least one second active device to be driven by the second drive signal, where the output circuit is to amplify and output a radio frequency (RF) signal.

Abstract: A frequency synthesizer on an integrated circuit provides a local oscillator (LO) signal for RF operations and also functions as an injection clock signal source during crystal oscillator startup. The integrated circuit goes into a sleep mode in which the crystal oscillator is off and responsive to a wakeup event the crystal oscillator starts up again using the injection clock signal sourced from the frequency synthesizer. Parameters that cause the injection clock signal to match the crystal oscillator frequency are stored. The frequency synthesizer includes a phase-locked loop having an LC oscillator. A digital to analog converter controls the LC oscillator during injection. During an initial power up of the integrated circuit, a PLL in the frequency synthesizer locks to the crystal oscillator frequency to determine the parameters to store for injection.

Abstract: In an embodiment, an apparatus includes: a modulator to modulate a first signal; a distortion circuit coupled to the modulator to digitally pre-distort the first signal to compensate for a distortion of an amplifier; a distortion characterization circuit coupled to the distortion circuit to determine the distortion of the amplifier and configure the distortion circuit based on the determined distortion; a mixer coupled to the distortion circuit to upconvert the pre-distorted first signal to a pre-distorted radio frequency (RF) signal; and the amplifier coupled to the mixer to amplify the pre-distorted RF signal and output an amplified RF signal.

Abstract: In one embodiment, an apparatus includes: a digital baseband circuit to receive a digital baseband signal and output a first digital baseband signal and a second digital baseband signal, the second digital baseband signal comprising a scaled version of the first digital baseband signal; a first transmitter signal path coupled to the digital baseband circuit to process the first digital baseband signal and output a first radio frequency (RF) signal; a second transmitter signal path coupled to the digital baseband circuit to process the second digital baseband signal and output a second RF signal; a first power amplifier coupled to the first transmitter signal path to amplify the first RF signal and output an amplified first RF signal; and a second power amplifier coupled to the second transmitter signal path to amplify the second RF signal and output an amplified second RF signal.

Abstract: In an embodiment, an apparatus includes: a modulator to modulate a first signal; a distortion circuit coupled to the modulator to digitally pre-distort the first signal to compensate for a distortion of an amplifier; a distortion characterization circuit coupled to the distortion circuit to determine the distortion of the amplifier and configure the distortion circuit based on the determined distortion; a mixer coupled to the distortion circuit to upconvert the pre-distorted first signal to a pre-distorted radio frequency (RF) signal; and the amplifier coupled to the mixer to amplify the pre-distorted RF signal and output an amplified RF signal.

Abstract: In one embodiment, an apparatus includes: a digital baseband circuit to receive a digital baseband signal and output a first digital baseband signal and a second digital baseband signal, the second digital baseband signal comprising a scaled version of the first digital baseband signal; a first transmitter signal path coupled to the digital baseband circuit to process the first digital baseband signal and output a first radio frequency (RF) signal; a second transmitter signal path coupled to the digital baseband circuit to process the second digital baseband signal and output a second RF signal; a first power amplifier coupled to the first transmitter signal path to amplify the first RF signal and output an amplified first RF signal; and a second power amplifier coupled to the second transmitter signal path to amplify the second RF signal and output an amplified second RF signal.

Abstract: An apparatus includes a first integrated circuit (IC) that includes a first radio-frequency (RF) circuit to process RF signals, a first antenna port to couple to one or more antennas, and a first switch integrated in the first IC and coupled to the first antenna port. The apparatus further includes a second IC that includes a second RF circuit to process RF signals, a second antenna port to couple to the one or more antennas, and a second switch integrated in the second IC and coupled to the second antenna port.

Abstract: In one aspect, an apparatus includes: a first power amplifier to receive a first voltage signal and to output a first current; a second power amplifier to receive a second voltage signal and to output a second current; and a transformer coupled to the first power amplifier and the second power amplifier. The transformer may have multiple differential input ports to realize a controllable impedance based on a desired output power level.

Abstract: In one example, a semiconductor die includes multi-standard, multi-channel expandable television/satellite receiver that can be flexibly implemented in a number of different configurations to enable incorporation into a plurality of different systems. The semiconductor die may include multiple tuners to receive and tune a terrestrial radio frequency (RF) signal and a satellite RF signal. These tuners may include different frequency synthesizers including voltage controlled oscillators (VCOs) to generate VCO signals at different frequencies, mixers to downconvert the RF signals to baseband signals using the VCO signals. In an implementation, the semiconductor die may further include shared circuitry coupled to the tuners to digitize, process and demodulate the baseband signals.

Abstract: In one example, a semiconductor die includes multi-standard, multi-channel expandable television/satellite receiver that can be flexibly implemented in a number of different configurations to enable incorporation into a plurality of different systems. The semiconductor die may include multiple tuners to receive and tune a terrestrial radio frequency (RF) signal and a satellite RF signal. These tuners may include different frequency synthesizers including voltage controlled oscillators (VCOs) to generate VCO signals at different frequencies, mixers to downconvert the RF signals to baseband signals using the VCO signals. In an implementation, the semiconductor die may further include shared circuitry coupled to the tuners to digitize, process and demodulate the baseband signals.

Abstract: An apparatus includes a first integrated circuit (IC) that includes a first radio-frequency (RF) circuit to process RF signals, a first antenna port to couple to one or more antennas, and a first switch integrated in the first IC and coupled to the first antenna port. The apparatus further includes a second IC that includes a second RF circuit to process RF signals, a second antenna port to couple to the one or more antennas, and a second switch integrated in the second IC and coupled to the second antenna port.