This application provides a control circuit, a control method, and an electronic device the control circuit comprising: a first control sub-circuit configured to receive a first power supply signal from a first power supply sub-circuit in an electronic device that includes the control circuit and output a first control signal; a second control sub-circuit configured to receive a second power supply signal from a second power supply sub-circuit in the electronic device and output a second control signal under control of the first control signal, wherein the second control signal is used to control a functional sub-circuit in the electronic device to be disabled during power-on and power-off process of the electronic device.

Certain aspects of the present disclosure provide a switch architecture for switching between a low power amplifier and a high power amplifier. One example amplification system includes a high power amplifier and a low power amplifier. The amplification system further includes a first switch coupled between the high power amplifier and an output. The amplification system further includes a second switch coupled between the output and a reference potential. The second switch is further coupled between the low power amplifier and the output and configured to selectively couple the low power amplifier to the output. The amplification system further includes a third switch coupled between the low power amplifier and the second switch.

Certain aspects of the present disclosure provide a switch architecture for switching between a low power amplifier and a high power amplifier. One example amplification system includes a high power amplifier and a low power amplifier. The amplification system further includes a first switch coupled between the high power amplifier and an output. The amplification system further includes a second switch coupled between the output and a reference potential. The second switch is further coupled between the low power amplifier and the output and configured to selectively couple the low power amplifier to the output. The amplification system further includes a third switch coupled between the low power amplifier and the second switch.

A monolithic microwave integrate circuit (MMIC) presents as a power amplifier including a 9:1 overlay transformer and artificial low impedance transmission lines. The 9:1 overlay transformer effects the output impedance thereof. The artificial low impedance transmission lines behave as inductors without occupying an amount of space equivalent to that of an inductor having similar properties as the artificial low impedance transmission line.

A monolithic microwave integrate circuit (MMIC) presents as a power amplifier including a 9:1 overlay transformer and artificial low impedance transmission lines. The 9:1 overlay transformer effects the output impedance thereof. The artificial low impedance transmission lines behave as inductors without occupying an amount of space equivalent to that of an inductor having similar properties as the artificial low impedance transmission line.

An output circuit of an amplifier which does not change power consumption. Since the output circuit of the amplifier does not flow, to a power supply circuit, a current correlated to a signal, the output circuit is not affected by the power supply circuit. The output circuit of the amplifier is provided with: a three-terminal amplifying element having an input terminal, an output terminal, and a common terminal; and a constant current circuit which is connected to the common terminal, and which flows a substantially constant current to the three-terminal amplifying element. The output terminal is grounded, and amplified output is taken out between the output terminal, and a contact point between the common terminal and the constant current circuit. Thus, the consumption current of the output circuit of the amplifier is merely the current flowing in the constant current circuit.

An output circuit of an amplifier which does not change power consumption. Since the output circuit of the amplifier does not flow, to a power supply circuit, a current correlated to a signal, the output circuit is not affected by the power supply circuit. The output circuit of the amplifier is provided with: a three-terminal amplifying element having an input terminal, an output terminal, and a common terminal; and a constant current circuit which is connected to the common terminal, and which flows a substantially constant current to the three-terminal amplifying element. The output terminal is grounded, and amplified output is taken out between the output terminal, and a contact point between the common terminal and the constant current circuit. Thus, the consumption current of the output circuit of the amplifier is merely the current flowing in the constant current circuit.

A power amplifier circuit includes a first transistor having a base to which a radio frequency (RF) signal is supplied and a collector to which a variable power-supply voltage corresponding to a level of the RF signal is supplied, and being configured to amplify the RF signal; a bias circuit including a second transistor configured to supply a bias current to the base of the first transistor; and an adjustment circuit configured to cause the bias current to be supplied to the base of the first transistor to decrease with decrease in the variable power-supply voltage by causing a current to be supplied to a base of the second transistor to decrease.

A power amplifier circuit includes a first transistor having a base to which a radio frequency (RF) signal is supplied and a collector to which a variable power-supply voltage corresponding to a level of the RF signal is supplied, and being configured to amplify the RF signal; a bias circuit including a second transistor configured to supply a bias current to the base of the first transistor; and an adjustment circuit configured to cause the bias current to be supplied to the base of the first transistor to decrease with decrease in the variable power-supply voltage by causing a current to be supplied to a base of the second transistor to decrease.

A high-frequency module according to the present disclosure includes: an MMIC; a multilayer substrate on which the MMIC is mounted; a signal wire that is arranged above the multilayer substrate, is connected to the MMIC and is a transmission path that transmits a high-frequency signal outputted from the MMIC; and a ground wire having at least one end that is connected to a ground electrode on an upper surface of the multilayer substrate and that is arranged so as to straddle the signal wire.