Abstract: The present invention relates to a device and a method for regulating the output power of an amplifier stage, e.g. an amplifier stage in a mobile data transmission system.

Abstract: A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal is shown. The DBS may include a first biasing circuit that produces a bias signal and a second biasing circuit in signal communication with both the first biasing circuit and the amplifier, wherein the second biasing circuit compares the bias signal to a predetermined threshold and in response produces the adjusted bias signal.

Abstract: A high frequency power amplifier includes an amplifying device for amplifying an input high frequency signal, a harmonic reflection circuit for reflecting a harmonic outputted from the amplifying device, and a harmonic generating circuit provided at an input terminal of the amplifying device, the harmonic generating circuit including a divider for dividing an input signal of a fundamental wave into two parts, a harmonic generator for generating a second harmonic from one part of the fundamental wave signal, and a combiner for combining the second harmonic generated from the harmonic generator with the other part of the fundamental wave signal to offer a combined signal to the amplifying device, wherein the harmonic reflection circuit reflects the second harmonic.

Abstract: An amplifying apparatus includes a splitting unit for splitting an input signal into a first split signal and a second split signal; phase-shifting unit for phase-shifting the first split signal and the second split signal, respectively; a first amplifying unit for amplifying a first phase-shifted signal and outputting the signal as a first output signal; a second amplifying unit for amplifying, in a substantially identical manner to the first amplifying unit, a second phase-shifted signal and outputting the signal as a second output signal; and a matching unit for matching the first output signal and the second output signal to a first transmission unit and a second transmission unit, respectively. The first transmission unit is for transmitting the first output signal from the matching unit to a load resistor, and the second transmission unit is for transmitting the second output signal from the matching unit to the load resistor.

Abstract: A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the load and the need for DC coupling capacitors is eliminated.

Abstract: A first gain stage and a second gain stage having different gains are linked in cascade to construct a wide range and high resolution programmable gain amplifier. The second gain stage can be used only for low gain and low power consumption. Furthermore, two pairs of chopper circuits are used to shift flicker noise when the programmable gain amplifier is operated.

Abstract: An apparatus has an input terminal configured to receive an input signal, a network coupled to the input terminal and configured to provide a plurality of amplified input signals, and a directional coupler coupled to the network and configured to couple at least one of the plurality of amplified input signals to an output terminal.

Abstract: Aspects of a method and system for processing signals via an integrated low noise amplifier having a configurable input signaling mode are provided. For an unbalanced input signal, a first input terminal of the LNA may be communicatively coupled to ground via an inductance and a bias point of the LNA may be communicatively coupled to a first bias voltage. For a balanced input signal, the first input terminal of the LNA may be communicatively coupled to the balanced signal and the bias point may be communicatively coupled to a second bias voltage. The LNA may comprise a center-tapped differential inductor which may be coupled to an output terminal of the LNA and may enable the LNA to output differential signals regardless of the input signaling mode. In various embodiments of the invention, the LNA may be utilized to amplify GNSS signals such as GPS signals.

Abstract: The frequency and transient responses of a CMOS differential amplifier are improved by employing one or more compensating capacitors. A compensating capacitor coupled to a differential input of the CMOS differential amplifier is used to inject current into the differential input, such that the net current flow through the gate-to-drain capacitance of a MOS input transistor approaches zero. Thus, the Miller effect with respect to that MOS input transistor is substantially reduced or eliminated, resulting in increased frequency and transient responses for the CMOS differential amplifier. In one embodiment, the CMOS differential amplifier is a CMOS current mirror differential amplifier.

Abstract: A power converter receiving a single-sided supply which is ground-terminated and providing a regulated positive supply and a regulated negative supply that is optimized to the expected output range of a class AB amplifier, as well as providing excellent efficiency. The converter finds application as a compact converter to power an audio amplifier driving an audio device which is ground terminated, such as a speaker.

Abstract: Provided is a switched-capacitor variable gain amplifier having high voltage gain linearity. According to the above amplifier, a sampling capacitor is shared and used at a sampling phase and an amplification phase, and thus a voltage gain error caused by capacitor mismatch can be reduced. Also, using a unit capacitor array enables circuit design and layout to be simplified. Further, in the amplifier, a voltage gain can be easily controlled to be more or less than 1, as necessary, and power consumption and kT/C noise can be reduced by a feedback factor that is relatively large, so that gain amplification performance can be improved.

Abstract: Auto-gain correction in a precision amplifier provides continuous calibration of the gain of the two differential input stages relative to each other and thus significantly minimizes the effects of device mismatch and temperature. Auto-gain correction together with auto-zero minimizes the effects of common mode input voltage on the amplifier and eliminates the need for trim associated with the matching of the two differential input stages. Improved gain matching enhances the accuracy of the auto-zero, which further improves the accuracy of auto-gain correction, resulting in a synergy with both operating together. The implementation of the auto-zero using an input pair of series capacitors in conjunction with a common input reference and a feedback pair of series capacitors in conjunction with a common feedback reference provides for decoupling the common mode voltage of the input differential pair or feedback differential pair. Various features may be used in sub-combinations as desired.

Abstract: Aspects of the disclosure can provide a bandpass transconductance amplifier that can include a minuend transconductance amplifier that converts a voltage signal to a first current and a subtrahend transconductance amplifier that converts the voltage signal to a second current having substantially the same amplitude as the first current but opposite polarity in both a first and a second stopband. The second current can have a substantially smaller amplitude than the first current in a passband. The disclosed bandpass transconductance amplifier can also include a controller that can tune the passband and the stopbands and a summing circuit that can add the first current and the second current.

Abstract: A high-efficiency single-to-differential amplifier has a first transistor acting as a first amplification stage. A second transistor, a third transistor, a first choke, a second choke, and a first capacitor form a second single-to-differential amplification stage. The first amplification stage receives and amplifies an input signal, outputs the amplified signal to the second single-to-differential amplification stage through a coupling module, and concurrently provides DC bias current to the second single-to-differential amplification stage through a tank. The second single-to-differential amplification stage reuses DC current of the first amplification stage, amplifies the output signal of the first amplification stage, and transfers it to a differential output.

Abstract: A power amplifier includes: an amplifying transistor; a bias circuit; a first diode; a second diode; a matching attenuating circuit; a first current mirror circuit; a serial resonant circuit, and a switch. In an amplification mode, the bias circuit supplies a bias current to the amplifying transistor, and the first current mirror circuit turns off the first and second diodes, and the switch. In an attenuation mode, the bias circuit supplies no bias current to the amplifying transistor, and the first current mirror circuit turns on the first and second diodes and the switch.

Abstract: A variable gain amplifying device that amplifies an input signal and outputs the amplified signal, has a controlling circuit that controls the gain by controlling turning on and off of first MOS transistors and third MOS transistors so that the sum of the number of first MOS transistors turned on and the number of third MOS transistors turned on is “n” by outputting a control signal to the gates of the first MOS transistors and the third MOS transistors.

Abstract: A method and system to use floating differential output amplifiers wired in series and parallel to achieve arbitrary output drive voltage and current for the applications load. One embodiment includes the use of multiple differential amplifiers wired in series to generate a high voltage differential amplifier, while only partially using no-feedback buffer amplifiers and obtaining performance equivalent to an implementation that uses only buffer amplifiers. This is achieved by forcing the mismatch errors of conventional amplifiers to become power supply ripple. A second embodiment includes the use of a power supply centering technique to implement a floating asymmetrical differential amplifier. A third embodiment includes the use of multiple floating differential amplifiers, sharing a common power supply with individual biasing and isolation of each section of the amplifier, to allow high power amplifiers to be built with an arbitrary number of low power modules.

Abstract: A predistorter for correcting distortion caused by a memory effect in amplifying a signal by an amplifier is provided. In the memory PD 2 provided to the predistorter, the level detection means 21 detects the level of the signal, the coefficient output means 22 outputs the coefficient corresponding to the detected level, the delay means 23 delays the output coefficient, the difference detection means 24 detects the difference between the output coefficient and the delayed coefficient, the multiplication means 25 multiplies the detected difference with the signal, and the combination means 26 combines the result of the multiplication and the signal. Thus, the result of the combination is output to the amplifier.

Abstract: A low frequency amplifier uses a switched bridge circuit, providing a first frequency output. A transformer circuit receiving the first frequency output from the switched bridge circuit. Power from the transformer is output from a plurality of secondaries and the power from the secondaries is supplied to the corresponding output switching circuits and provided as switched outputs from the transformer circuit. The switched outputs from the transformer circuit are responsive to a transformer output from the transformer at the first frequency, and switch the transformer outputs in a timed sequence to provide a combined second frequency output. The second frequency output has a lower frequency than the transformer outputs.

Abstract: A power supply device for driving an amplifier includes a power generator for providing a first voltage for a first power reception end of the amplifier, a power conversion unit coupled to the power generator, for converting the first voltage into a second voltage, a charge pump coupled between the power conversion unit and a second power reception end of the amplifier, for generating a third voltage for the amplifier according to the second voltage, and a control unit coupled to the power conversion unit, for controlling the power conversion unit, so as to adjust the second voltage to make the third voltage equal to a specific multiple of the first voltage.