Broadband feedforward power amplifiers are disclosed herein. In certain embodiments, a broadband feedforward power amplifier includes a power amplifier electrically connected between a radio frequency (RF) input and an RF output, and a feedforward compensation circuit including a first amplifier electrically connected in parallel with the power amplifier, a load impedance, and a second amplifier electrically connected between the radio frequency input and the load impedance. The feedforward compensation circuit generates a compensation signal based on sensing an output of the first amplifier and an output of the second amplifier, and provides the compensation signal to the radio frequency output to thereby compensate the power amplifier for non-linearity.

A flash analog to digital converter includes a voltage generator circuit, an encoder circuit, and first and second double differential amplifier circuits. The voltage generator circuit generates reference voltages according to first and second voltages. The encoder circuit generates a digital signal corresponding to an input signal according to first signals. The first double differential amplifier circuit compares the input signal with a first reference voltage in the reference voltages, to generate a corresponding one of the first signals. The second double differential amplifier circuit compares the input signal with a second reference voltage in the reference voltages, to generate a corresponding one of the first signals. A difference between the first voltage and the first reference voltage is less than that between the first voltage and the second reference voltage, and the first and the second double differential amplifier circuits have different circuit architectures.

The disclosure relates to microphone and other sensor assemblies having a transduction element and an integrated circuit. The integrated circuit includes a switched-capacitor delta-sigma analog-to-digital converter (ADC) including a first integrator stage having a switched-capacitor circuit and a first plurality of parallel amplifiers. A logic circuit coupled to the integrator circuit is configured to selectably disable a subset of enabled amplifiers of the first integrator stage during a first phase of operation and to re-enable the subset of disabled amplifiers during a second phase.

A combination amplifier can include a “main amplifier circuit” for signal amplification, and a matching “compensation amplifier circuit” to monitor distortion in the main amplifier output signal. The compensation amplifier circuit provides a compensation signal to the main amplifier circuit to compensate for and servo out distortion therein. The compensation amplifier circuit includes a passive input network and an amplifier. The passive input network can connect to both the input and output nodes of the main amplifier circuit such that the input and output signals cancel within the passive input network, leaving only the low level distortion component introduced in the main amplifier. Thus, the compensation amplifier is then only operating on the low-level distortion introduced in the main amplifier to generate the compensation signal. Because the compensation amplifier is then only operating on the very low distortion signal, any distortion it introduces into the compensation signal is negligible.

Apparatus and the methods for stacked power amplifiers are provided. In certain embodiments, a mobile device includes a transceiver that generates a first radio frequency input signal and a second radio frequency input signal, and a front end system including a stacked power amplifier that receives power from a power high supply voltage and a power low supply voltage. The stacked power amplifier includes a first power amplifier that amplifies the first radio frequency input signal and a second power amplifier that amplifies the second radio frequency input signal. The first power amplifier and the second power amplifier are electrically connected in a stack between the power high supply voltage and the power low supply voltage and operate with a shared DC bias current.

An optical amplifying module and a manufacturing method are provided. The optical amplifying module includes a current amplifying element, a light emitting element and a light receiving element. A main substrate of the current amplifying element has a first surface and a second surface, which are opposed to each other. Moreover, plural first main electrodes are installed on the first surface, and plural second main electrodes are installed on the second surface. The light emitting element is installed beside the first surface of the current amplifying element. The light emitting units of the light emitting element are electrically coupled with the corresponding first main electrodes. The light receiving element is installed beside the second surface of the current amplifying element. The light receiving units of the light receiving element are electrically coupled with the corresponding second main electrodes.

A power amplifier circuit 10 includes amplifiers 102 and 103, bias circuits 1023 and 1033, and a control circuit 106 that controls the bias circuits 1023 and 1033. When the power amplifier circuit 10 operates in a low power mode, the control circuit 106 controls the bias circuit 1023 and the bias circuit 1033 such that a bias current or voltage is supplied to the amplifier 102 and a bias current or voltage is not supplied to the amplifier 103. When the power amplifier circuit 10 operates in a high power mode in which an output power is higher than an output power in the low power mode, the control circuit 106 controls the bias circuit 1023 and the bias circuit 1033 such that a bias current or voltage is supplied to the amplifier 102 and a bias current or voltage is supplied to the amplifier 103.

Disclosed are systems configured to deliver wireless charging power to electronic devices and methods for delivering wireless charging power. In some implementations, a system can include a programmable radio-frequency generator capable of generating a beam of electromagnetic pulsed radiation and plurality of solid-state amplifiers to amplify the beam of electromagnetic pulsed radiation. The amplified beam of electromagnetic pulsed radiation can be configured to wirelessly charge electronic devices at distances greater than about 100 meters.

Methods and circuital arrangements for turning OFF branches of a multi-branch cascode amplifier are presented. First and second switching arrangements coupled to a branch allow turning OFF the branch while protecting transistors of the branch from a supply voltage that may be greater than a tolerable voltage of the transistors. The first switching arrangement includes a transistor-based switch that is in series connection with the transistors of the branch. The first switching arrangement drops the supply voltage during the OFF state of the branch and provides a conduction path for a current through the branch during the ON state of the branch. A resistor and a shunting switch are coupled to a gate of the transistor-based switch to reduce parasitic coupling effects of the transistor-based switch upon an RF signal coupled to the branch during the ON state and OFF state of the branch.

An open loop process and temperature independent bias circuit for stacked device amplifiers is disclosed herein. In one or more embodiments, a method for biasing a stacked high-voltage signal amplifier with a voltage divider bias module comprises generating, by the voltage divider bias module from a power supply voltage (VDD), a plurality of control voltage biases, which comprise a plurality of voltage references plus an offset voltage term (Vtemp). In one or more embodiments, the plurality of voltage references are each proportional to a division of the power supply voltage (VDD), and the offset voltage term (Vtemp) is proportional to temperature and is a function of process variation. The method further comprises biasing, a plurality of devices of the stacked high-voltage signal amplifier, with the control voltage biases.