8results about "Amplifiers with multiple amplifying elements" patented technology

A linear power source circuit includes: an input unit to which an input signal is input and which outputs a first current signal; a current-voltage convertor which converts the first current signal into a first voltage signal; a voltage-current convertor configured to convert the first voltage signal into a second current signal; and an output unit configured to generate an output voltage signal from the second current signal by a first current mirror unit, a second current mirror unit, and a third current mirror unit, and configured to output the output voltage signal to an output terminal. The input unit and the current-voltage convertor constitute a current feedback type operational amplifier.

The present application discloses a power amplifier and a control method thereof, and a vehicle audio system. The power amplifier includes: at least two first bridge-connected amplifier circuits and at least two second bridge-connected amplifier circuits; the negative pole of the first load of each first bridge-connected amplifier circuit is coupled to the positive pole of the second load of each second bridge-connected amplifier circuit through a gating circuit; when the input signal input to the first signal input terminal of the first bridge-connected amplifier circuit is less than a preset threshold, the gating circuit is turned on, and the first load current of the first bridge-connected amplifier circuit is transmitted to the second load of the second bridge-connected amplifier circuit by the gating circuit. The above scheme can improve the efficiency of the class AB power amplifier.

To provide an amplifier which reduces a residual offset by reducing a glitch noise.SOLUTION: An amplifier 1A includes two auto zero amplifiers 21A, 22A mutually connected in parallel. The auto zero amplifiers 21A, 22A are provided to be switchable to: an offset calibration mode in which, after an output end is separated from an output of a transconductance amplifier 201, a calibration signal of reducing an offset component and a low frequency noise component of the transconductance amplifier 201 is sampled; an amplification mode in which, after the output end is connected to the output of the transconductance amplifier 201, the output of the transconductance amplifier 201 having the reduced offset component and low frequency noise component by the calibration signal, is output from the output end; and a glitch calibration mode in which, in a state that the output end is separated from the output of the transconductance amplifier 201, the output of the transconductance amplifier 201 is approached to the output of the output end.SELECTED DRAWING: Figure 1

Disclosed is an implantable device for controllably delivering neural stimuli. The device comprises a pulse generator configured to deliver neural stimuli via one or more stimulation electrodes to a neural pathway of a patient. The device comprises measurement circuitry configured to capture signal windows from signals sensed on the neural pathway by one or more measurement electrodes, wherein the measurement circuitry comprises a configurable compound amplifier configured to amplify the captured signal windows. The device is configured to control the pulse generator to deliver a neural stimulus according to one or more stimulus parameters, measure a characteristic of an evoked neural response in an amplified captured signal window subsequent to the delivery of the neural stimulus, determine a feedback variable from the measured characteristic of the evoked neural response and adjust the one or more stimulus parameters so as to maintain the feedback variable at or near a target value.

A phase inverted amplifier includes: an amplifying transistor that amplifies an input signal, two electronic switches each having a first end that is connected to an output end of the amplifying transistor, and that have ON / OFF states which are controlled by two control signals, and a transformer that includes a primary winding connected between two second ends of the two electronic switches, and a secondary winding that outputs an amplification signal from a first end.

Embodiments included herein are directed towards a relay-driver circuit including a driving domain configured to prevent inadvertent activation of an electrical load. Embodiments may a driver control circuit and a cascode driver control circuit connected in series. The driver control circuit may have a primary negative pole operatively connected to ground (GND), and a primary positive pole configured to feed an output from the driver control circuit into the cascode driver control circuit. The cascode driver control circuit may have a secondary negative pole configured to receive the output from the driver control circuit, and a secondary positive pole operatively connected to the electrical load.

The present invention discloses an instrument amplifier for bioelectric signals, including a signal input module, which amplifies the received bioelectric signal and performs impedance matching, and then outputs a low-impedance signal; a charge transfer module, which restores the waveform of the amplified low-impedance signal after low-pass high-frequency clutter removal, and outputs a low-pass frequency point signal; and a signal module, which is used to provide a signal source to the charge transfer module for charge transfer output. By using the charge transfer principle, a circuit with a high common mode ratio can be constructed using an ordinary operational amplifier, thereby making the present invention easier to implement in practical applications while reducing the number of components, reducing the volume of the application circuit, reducing the application cost, and expanding the advantages of single operational amplifier application in the instrument circuit space.

The present invention provides a weak current signal amplification circuit, which includes a first to Nth amplification current mirror connected in series, a first to N-1th reference current branch respectively connected in parallel to the input ends of the second to Nth amplification current mirrors, and an Nth reference current branch connected in parallel to the output end of the amplification circuit. When a small effective current signal superimposed on a large reference current is input, it can achieve step-by-step amplification of the small effective current by reducing the reference current, and amplify the small effective current signal when the change in the reference current is not significant.