Abstract: Methods and systems are disclosed that utilize digital control loops to control an amplitude level for output signals generated by crystal oscillator circuitry. The disclosed embodiments utilize multiple selectable current drive circuits to control the amplitude level of the output signals from crystal oscillator circuitry. The current drive circuits are selectably used, or not used, to provide a bias current to the crystal oscillator circuitry based upon a multi-bit digital control signal. The multi-bit digital control signal can be generated, for example, by control circuitry that compares the oscillator output signal to a reference output signal level.

Abstract: A communications device is provided. The communications device includes a first antenna port coupled to a signal line, transmitter circuitry coupled to the signal line and configured to broadcast a radio frequency (RF) output signal across the first antenna port, tuning circuitry coupled to the signal line, and a controller configured to adjust a tuning of the tuning circuitry. The first antenna port, the transmitter circuitry, the tuning circuitry, and the controller are at least partially integrated on the same integrated circuit.

Abstract: A communications device is provided. The communications device includes first output stage circuitry configured to generate a first radio frequency (RF) output signal in response to receiving an RF input signal, a first antenna port configured to couple to a first antenna and configured receive the first RF output signal from the first output stage circuitry, second output stage circuitry configured to generate a second RF output signal in response to receiving the first RF output signal, and a second antenna port configured to couple to a second antenna and configured to receive the second RF output signal from the second output stage circuitry. The first output stage circuitry, the first antenna port, the second output stage circuitry, and the second antenna port are at least partially integrated on the same integrated circuit.

Abstract: A low-noise amplifier includes a first resistor that receives a first signal of a differential input signal, and a second resistor that receives a second signal of the differential input signal. The amplifier includes a first transconductance device coupled to the first resistor that provides a first signal of a differential output signal, and a second transconductance device coupled to the second resistor, that provides a second signal of the differential output signal. The receiver also includes a first capacitor coupled between the first resistor input and a control electrode on the second transconductance device, and a second capacitor coupled between the second resistor input and a control electrode on the first transconductance device. The low-noise amplifier can include additional gain stages.

Abstract: A radio frequency (RF) communications device is provided. The RF communications device includes transmitter circuitry configured to generate a calibration signal on a signal line coupled to an antenna port in a calibration mode of operation and an RF output signal for broadcast across the antenna port subsequent to the calibration mode of operation, tuning circuitry coupled to the signal line and configured to receive the calibration signal, and a controller configured to adjust a signal level of the calibration signal generated by the transmitter circuitry and a tuning of the tuning circuitry during the calibration mode of operation. The transmitter circuitry, the tuning circuitry, and the controller are at least partially integrated on the same integrated circuit.

Abstract: A low-noise amplifier includes a first resistor that receives a first signal of a differential input signal, and a second resistor that receives a second signal of the differential input signal. The amplifier includes a first transconductance device coupled to the first resistor that provides a first signal of a differential output signal, and a second transconductance device coupled to the second resistor, that provides a second signal of the differential output signal. The receiver also includes a first capacitor coupled between the first resistor input and a control electrode on the second transconductance device, and a second capacitor coupled between the second resistor input and a control electrode on the first transconductance device. The low-noise amplifier can include additional gain stages.

Abstract: A communications device is provided. The communications device includes a first antenna port coupled to a signal line, transmitter circuitry coupled to the signal line and configured to broadcast a radio frequency (RF) output signal across the first antenna port, tuning circuitry coupled to the signal line, and a controller configured to adjust a tuning of the tuning circuitry. The first antenna port, the transmitter circuitry, the tuning circuitry, and the controller are at least partially integrated on the same integrated circuit.

Abstract: A communications device is provided. The communications device includes a first antenna port coupled to a signal line, transmitter circuitry coupled to the signal line and configured to broadcast a radio frequency (RF) output signal across the first antenna port, tuning circuitry coupled to the signal line, and a controller configured to adjust a tuning of the tuning circuitry. The first antenna port, the transmitter circuitry, the tuning circuitry, and the controller are at least partially integrated on the same integrated circuit.