Abstract: A system comprises a radio receiver including an antenna, tunable RF notch filters that receive a desired RF signal and reject an interference signal, a LNA, a splitter, and a processor. A received RF signal is divided by the splitter and directed along a main signal path and an interference detection path. The interference detection path comprises a mixer that converts the received RF signal to an IF band, a synthesizer, and a SAW filter in communication with the mixer. The SAW filter rejects any IF signal generated due to a desired received RF signal and improves an accuracy/resolution of a detected interference frequency. The processor estimates the interference frequency based on a detected amplitude of signal samples and a synthesizer tuned frequency for that amplitude. If the detected amplitude is more than a threshold, then a control signal is sent to configure the notch filters at the interference frequency.

Abstract: A wideband power amplifier is presented. The wideband power amplifier configured to be coupled to a load having an impedance ZL, where the wideband power amplifier comprises: a quadrature coupler; a carrier amplifier coupled to the quadrature coupler; a peak amplifier coupled to the quadrature coupler; wherein the carrier amplifier saturates at an input power level lower than the input power level at which the peak amplifier saturates; wherein each of the carrier amplifier and the peak amplifier has a termination impedance of approximately Ropt, where Ropt is the optimum impedance at which the carrier amplifier and the peak amplifier will deliver rated max powers; a impedance transformer, coupled to the carrier amplifier having a characteristic impedance of 2*Ropt; an impedance transformer, coupled to the peak amplifier and the impedance transformer; wherein the impedance transformer is configured transform a load impedance ZL to 2*Ropt.

Abstract: A wideband power amplifier is presented. The wideband power amplifier configured to be coupled to a load having an impedance ZL, where the wideband power amplifier comprises: a quadrature coupler; a carrier amplifier coupled to the quadrature coupler; a peak amplifier coupled to the quadrature coupler; wherein the carrier amplifier saturates at an input power level lower than the input power level at which the peak amplifier saturates; wherein each of the carrier amplifier and the peak amplifier has a termination impedance of approximately Ropt, where Ropt is the optimum impedance at which the carrier amplifier and the peak amplifier will deliver rated max powers; a impedance transformer, coupled to the carrier amplifier having a characteristic impedance of 2*Ropt; an impedance transformer, coupled to the peak amplifier and the impedance transformer; wherein the impedance transformer is configured transform a load impedance ZL to 2*Ropt.

Abstract: A tracking system comprising: a radio frequency (RF) signal circulator; an iridium modem coupled to first port of the circulator; an antenna coupled to second port of the circulator, wherein the circulator passes a signal transmitted by the modem to the antenna when the switch is switched to a first mode; a low noise amplifier (LNA) coupled to third port of the circulator, wherein the circulator passes RF signals received from the antenna to the LNA; a diplexer coupled to an output of the LNA; a GNSS receiver coupled to a first output of the diplexer through a GNSS filter; an iridium filter coupled to a second output of the diplexer; wherein the switch couples the iridium filter to the modem when the iridium modem is in a receiving mode, and wherein the switch couples the modem to the first port when the modem is in a transmitting mode.

Abstract: A tracking system comprising: a radio frequency (RF) signal circulator; an iridium modem coupled to first port of the circulator; an antenna coupled to second port of the circulator, wherein the circulator passes a signal transmitted by the modem to the antenna when the switch is switched to a first mode; a low noise amplifier (LNA) coupled to third port of the circulator, wherein the circulator passes RF signals received from the antenna to the LNA; a diplexer coupled to an output of the LNA; a GNSS receiver coupled to a first output of the diplexer through a GNSS filter; an iridium filter coupled to a second output of the diplexer; wherein the switch couples the iridium filter to the modem when the iridium modem is in a receiving mode, and wherein the switch couples the modem to the first port when the modem is in a transmitting mode.

Abstract: A hybrid diplexer-circulator system including a circulator and a modified-diplexer is provided. The circulator includes a first circulator-port, a second circulator-port coupled to a first chain comprising a receiver module, and a third circulator-port coupled to a second chain comprising a satellite modem. The first chain receives first-frequency signals and reflects second-frequency signals. The second chain receives the second-frequency signals reflected from the first chain and transmits third-frequency signals. The modified-diplexer includes: a first diplexer-port of the modified-diplexer, which is shared as the first circulator-port; a second diplexer-port; and third diplexer-port in the second chain. The second diplexer port inputs the first-frequency signals from a filter in the first chain.

Abstract: A radio system, comprising an antenna; a baseband module, a power amplifier; and a variable power supply. The baseband module is configured to output a first signal to the antenna, pre-distort the first signal based on computed coefficients, and output a second signal. The second signal is determined based on one or more characteristics of the first signal, and the second signal is output if there is a change in the one or more characteristics of the first signal. The power amplifier is communicatively coupled to the baseband module and the antenna, and is configured to amplify the pre-distorted signal. The variable power supply is communicatively coupled to the power amplifier and the baseband module. The variable power supply is configured to receive the second signal and generate a variable drain supply voltage corresponding to the second signal. The drain supply voltage is output to the power amplifier.

Abstract: A hybrid diplexer-circulator system including a circulator and a modified-diplexer is provided. The circulator includes a first circulator-port, a second circulator-port coupled to a first chain comprising a receiver module, and a third circulator-port coupled to a second chain comprising a satellite modem. The first chain receives first-frequency signals and reflects second-frequency signals. The second chain receives the second-frequency signals reflected from the first chain and transmits third-frequency signals. The modified-diplexer includes: a first diplexer-port of the modified-diplexer, which is shared as the first circulator-port; a second diplexer-port; and third diplexer-port in the second chain. The second diplexer port inputs the first-frequency signals from a filter in the first chain.

Abstract: A torque measurement system that includes a rotor device and a stator device can perform automatic tuning to improve the initial tuning performed during design and assembly. The stator device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. Additionally or alternatively, the rotor device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. The adjustment of the capacitive elements can be based on the quality of signal detected at either the rotor device or stator device.

Abstract: A torque measurement system that includes a rotor device and a stator device can perform automatic tuning to improve the initial tuning performed during design and assembly. The stator device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. Additionally or alternatively, the rotor device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. The adjustment of the capacitive elements can be based on the quality of signal detected at either the rotor device or stator device.

Abstract: A torque measurement system that includes a rotor device and a stator device can perform automatic tuning to improve the initial tuning performed during design and assembly. The stator device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. Additionally or alternatively, the rotor device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. The adjustment of the capacitive elements can be based on the quality of signal detected at either the rotor device or stator device.

Abstract: A torque measurement system that includes a rotor device and a stator device can perform automatic tuning to improve the initial tuning performed during design and assembly. The stator device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. Additionally or alternatively, the rotor device can include a variable capacitive element and a micro-controller configured to adjust a capacitance value of the variable capacitive element. The adjustment of the capacitive elements can be based on the quality of signal detected at either the rotor device or stator device.