A power supply circuit includes a power amplifier that receives a direct current (DC) voltage from a first power source. A control signal applied to the power amplifier causes the power amplifier to convert the DC voltage to an alternating current (AC) output signal. The AC output signal is applied to a transformer that includes a first winding, a second winding, and a third winding. The first winding receives the AC output signal and the second winding receives an output current that varies in accordance with the AC output signal to apply current to a load. A rectifier includes a plurality of diodes configured to rectify a voltage across the third winding and clamp the voltage at the load. Return power from the third winding may be returned to the first power source.

A non-isolated power supply. A positive power and a negative power are respectively formed by charging a +VCC1 energy storage filter and a −VCC2 energy storage filter connected in series and discharging the +VCC1 energy storage filter 102 and the −VCC2 energy storage filter. The output positive and negative power may be differently combined by changing the capacities of the +VCC1 energy storage filter and the −VCC2 energy storage filter and may be equal or unequal.

A wireless repeater is disclosed. The wireless repeater can include a main booster with a first gain unit with a first adjustable gain and a second gain unit with a second adjustable gain. The wireless repeater can include a front end booster communicatively coupled to the main booster, with a coaxial cable coupled between the main booster and the front end booster. A test signal generator is configured to generate a direct current test signal or a radio frequency test signal to determine a signal loss of the coaxial cable. The wireless repeater can include a control unit to adjust one or more of the first adjustable gain or the second adjustable gain based on the determined signal loss of the coaxial cable.

A signal booster is disclosed that includes a first interface port, a second interface port, a third interface port, a downlink signal splitter device, an uplink signal splitter device, a main booster and a front-end booster. The uplink signal splitter device can include a first uplink splitter port configured to direct uplink signals from the second interface port towards the first interface port. The uplink signal splitter device can include a second uplink splitter port configured to direct uplink signals from the third interface port towards the first interface port. The main booster can include a main downlink amplification path and a main uplink amplification path. The front-end booster can include a front-end downlink amplification path and a front-end uplink amplification path.

A signal booster is disclosed that includes a first interface port, a second interface port, a third interface port, a downlink signal splitter device, an uplink signal splitter device, a main booster and a front-end booster. The uplink signal splitter device can include a first uplink splitter port configured to direct uplink signals from the second interface port towards the first interface port. The uplink signal splitter device can include a second uplink splitter port configured to direct uplink signals from the third interface port towards the first interface port. The main booster can include a main downlink amplification path and a main uplink amplification path. The front-end booster can include a front-end downlink amplification path and a front-end uplink amplification path.

A wireless repeater is disclosed. The wireless repeater can include a first gain unit with a first adjustable gain configured to be applied to a first-direction signal. The wireless repeater can include a second gain unit with a second adjustable gain configured to be applied to a second-direction signal. The wireless repeater can include a signal splitter communicatively coupled to the first gain unit and the second gain unit. The wireless repeater can include a control unit communicatively coupled to the first gain unit and the second gain unit. The control unit can control the first adjustable gain and the second adjustable gain to compensate for a signal loss of the signal splitter.

A signal booster is disclosed. The signal booster can include a first gain unit with a first adjustable gain configured to be applied to a first-direction signal. The signal booster can include a second gain unit with a second adjustable gain configured to be applied to a second-direction signal. The signal booster can include a signal splitter communicatively coupled to the first gain unit and the second gain unit. The signal booster can include a control unit communicatively coupled to first gain unit and the second gain unit. The control unit can be configured to control the first adjustable gain and the second adjustable gain to compensate for a signal loss of the signal splitter.

A non-isolated power supply. A positive power and a negative power are respectively formed by charging a +VCC1 energy storage filter and a ?VCC2 energy storage filter connected in series and discharging the +VCC1 energy storage filter 102 and the ?VCC2 energy storage filter. The output positive and negative power may be differently combined by changing the capacities of the +VCC1 energy storage filter and the ?VCC2 energy storage filter and may be equal or unequal.

This disclosure is directed to a power amplifier (PA) including circuitry to amplify and filter transmission signals in a radio frequency (RF) circuit. The PA may include multiple core amplifiers coupled to a power combiner to amplify and filter the transmission signals. For example, the PA may activate the core amplifiers to provide the transmission signals with a peak output power. Alternatively, the PA may activate a reduced number of the core amplifiers to provide the transmission signals with a reduced output power lower than the peak output power. Activating a portion of the PA when providing the transmission signals with a reduced output power may reduce a power consumption and improve power efficiency of the PA.

A signal booster is disclosed that includes a first front-end booster, a second front-end booster, a signal combiner device and a main booster. The first front-end booster can include a first signal power level detector and a first gain unit. The second front-end booster can include a second signal power level detector and a second gain unit. The main booster can include a third signal power level detector and a third gain unit. The main booster can further include a fourth signal power level detector and a fourth gain unit. The first front-end booster can further include a fifth signal power level detector and a fifth gain unit. The second front-end booster can further include a sixth signal power level detector and a sixth gain unit.