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5886576 |
Electrical power amplifier for continuous cardiac output monitoring
A continuous cardiac output monitor a general-purpose monitoring console with local display and communication facilities, and a module removably interfacing with the console to configure the latter...
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5847602 |
Method and apparatus for linearizing an efficient class D/E power amplifier using delta modulation
A delta-modulated magnitude amplifier is used to amplify the magnitude component of an RF power amplifier that employs envelope elimination and restoration. The delta-modulated amplifier introduces...
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5789975 |
Analog signal amplifier and audio signal amplifier
An input limiting circuit limits the maximum signal voltage value of input signal voltage supplied from a signal source through an input terminal. A power amplifying circuit converts the signal...
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5777512 |
Method and apparatus for oversampled, noise-shaping, mixed-signal processing
A signal processing circuit is provided which includes a frequency selective network in a feedback loop for noise shaping purposes. A sampling analog-to-digital converter in the feedback loop...
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5672998 |
Class D amplifier and method
A Class D (audio) amplifier and method in which an input signal for the amplifier is pulse width modulated outside of the amplifier's feedback loop, and in which the pulse width modulated input...
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5617058 |
Digital signal processing for linearization of small input signals to a tri-state power switch
An all digital switching amplifier wherein linearization of the power switch is accomplished solely by using three states. A small, fixed width, bi-state compensating carrier waveform is added to...
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5535438 |
Phase linear class E amplifier for a satellite communication terminal which communicates with a low earth orbiting satellite
A low earth orbiting satellite communication terminal includes a data signal generator, a modulator, and a class E switching amplifier. The modulator converts a data signal from the data signal...
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5434540 |
High efficiency power amplifier
In a high efficiency F-class amplifier, output current may be reduced to cause distortion of the current, or deterioration of high efficiency operation of the amplifier, when an instantaneous...
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5422597 |
Means and method of enhancing signal resolution and dynamic range extension in a pulse width modulation amplifier
An amplifier (1) used with a pulse width modulated signal which improves the efficiency of a low level input signal comprises two or more switching devices (7,9) with common source/drain or...
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5345165 |
Frequency-stabilized two-state modulation using hysteresis control
A two-state modulation system includes a hysteretic comparator with variable thresholds, a two-state processor and an integrating element. A summing circuit combines a signal coupled from the...
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5345189 |
Vectorial signal combiner for generating an amplitude modulated carrier by adding two phase modulated constant envelope carriers
A circuit for combining first and second signals having the same frequency. The signals have a relative phase shift, 2a(t). The circuit generates a signal that is proportional to the sum or...
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5343161 |
Power amplifier apparatus
A power amplifier apparatus having an operational amplifier which works as a PWM (pulse width modulation) amplifier as well as an analog amplifier according to an input signal level to miniaturize...
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5247264 |
Combining circuit for Class-E RF power amplifiers
A combining circuit for Class-E RF power amplifiers includes a transformer for each power amplifier to be combined, the respective secondaries of the transformers being connected in series to the...
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5218315 |
Switching amplifier
An improved digital switching amplifier is disclosed. The amplifier utilizes a low-pass filter at the input of the switching comparator to give an improved signal to noise ratio at the final...
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5214392 |
Multilayered ceramic type electromagnetic coupler apparatus
A multilayered ceramic electromagnetic coupler apparatus includes coils formed on ceramic substrates. The coils are laminated and have insulting layers between the ceramic substrates, a modulator...
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5200707 |
Amplifier with multiple switched stages and noise suppression
An amplifier has at least several stages activated only to one of two bi-level states controlled in response to the value of an input source exceeding a threshold for each stage. Each stage has a...
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5187580 |
High power switch-mode radio frequency amplifier method and apparatus
Disclosed are both methods and a circuit to achieve powers of many kilowatts in radio frequency amplification using a switch mode amplifier in a new class of operation. In operation the invention...
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5170132 |
Chopper amplifier circuit for the supply of a current proportional to a voltage
The disclosure relates to fast amplification circuits that are designed to provide an output current of some amperes, proportional to an input voltage, and have a frequency spectrum that may go...
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5163174 |
Power amplifier
A power amplifier for amplifying analog input signals includes one or a plurality of amplifier modules which are connected in series on their output sides, which preferably each include a double...
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5160896 |
Class D amplifier
A hysteresis-type pulse width modulator for a class D audio amplifier converts an input voltage into a pulse width modulated waveform. The width of the pulses is related to the input voltage...
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5118997 |
Dual feedback control for a high-efficiency class-d power amplifier circuit
A dual feedback control system for a Class-D power circuit maximizes efficiency by controlling the magnitude and phase angle of the resonant load circuit using two separate feedback loops. The...
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5115203 |
Digital power amplifier
A wideband high efficiency amplification system for amplifying radio frequency signals to high power levels. The system includes components adapted for generating an RF carrier signal having a...
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5113145 |
Power amplifier for feeding an inductance with switched transistors
Switched transistors (T1 . . . through T4 . . .) are arranged in a bridge circuit such that a plurality of transistors (T1 . . . through T4 . . .) are connected in parallel in every bridge branch....
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5099203 |
Power amplifier having multiple switched stages and method of operating same
A power amplifier for a plate load of an AM, RF transmitter includes plural switching stages each powered by a DC source. Each stage is switched from non-sourced to saturation in response to the...
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5077540 |
Minimum pulse width switching power amplifier
A minimum pulse width switching power amplifier utilizes digital logic for generating a control pulse having a pulse width at least as large as a fixed minimum period of time when a base control...
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5063332 |
Feedback control system for a high-efficiency class-D power amplifier circuit
A closed-loop control system for a Class-D power amplifier circuit, having a variable output resonant circuit impedance, maintains high-efficiency operation by using the phase angle between the...
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5023566 |
Driver for a high efficiency, high frequency Class-D power amplifier
A driver circuit for a voltage-switching, high frequency Class-D power amplifier provides an input sinewave power signal and controls the transition time between switching the two active devices...
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RE33333 |
Digital audio amplifier having a high power output level and low distortion
A digital amplifier having a modulator for transforming the analog audio input signal into two complimentary trains of pulse width modulated signals for driving the power switches, which modulator...
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4764734 |
Class SM power amplifier
A class SM amplifier is provided having a threshold circuit with a plurality of threshold levels for generating a plurality of threshold signals. In response to an input signal passing a particular...
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4748421 |
Enhanced class SM power amplifier
A class SM amplifier is provided having a threshold circuit with a plurality of threshold levels for generating a plurality of threshold signals. In response to an input signal passing a particular...
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4743858 |
R. F. power amplifier
An r.f. power amplifier, typically a high efficiency, class E amplifier in which a reactive load circuit (18) is connected to a semiconductor switching device (10), the load circuit being designed...
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4727874 |
Electrosurgical generator with high-frequency pulse width modulated feedback power control
A pulse width modulation technique regulates the output power of each cycle of a radio frequency surgical signal of an electrosurgical generator. The delivered power of the surgical signal is...
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4683439 |
Digitally driven switching power amplifier system
A digital power amplifier system includes means providing a signal having predetermined characteristics is digitally synthesized and applied as input signals to a digital symmetrical pulse width...
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4673887 |
Digital driver for fixed power amplifier
A digital power amplifier system features an analog signal which is converted to a corresponding digital signal and is, in turn, applied as input signals in a digital binary format to a digital...
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4667144 |
High frequency, high voltage MOSFET isolation amplifier
A MOSFET isolation amplifier apparatus to allow stable high frequency linear operation of MOSFET power stages and to provide precise regulation of a load current through a magnetic yoke load....
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4649467 |
High efficiency MOSFET sine wave generator
A high efficiency MOSFET sine wave generator is provided using the class D pulse width modulation principle. A triangle wave at f 0 is compared to a variable amplitude sinusoid at about 1/10 f 0 ...
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4628275 |
Efficient power amplifier for high capacitive devices
An efficient power amplifier for high-capacitive device C2 in load string 10. The load string 10 includes a reference capacitor C3, a resistor R1, and an inductor L1. A large capacitor C1 is...
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4608541 |
Isolation amplifier
The invention comprises an isolation amplifier including an input circuit and an output circuit coupled through an isolation transformer. A switching type balanced modulator modulates a square wave...
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4446440 |
Dual mode amplifier
An apparatus amplifies a signal in two different modes. The apparatus amplifies the signal in a linear mode when the voltage of the signal is much less than the voltage of the power source, and in...
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4441081 |
Switching power driving circuit arrangement
This dual operating mode switching power driving circuit arrangement comprises an amplifying circuit of conventional form which is operated substantially as a Class A feedback amplifier in a...
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4439738 |
Class D pulse width modulated amplifier
An arrangement for improving the performance of Class D pulse width modulated amplifiers which comprises circuitry for short circuiting turns on the output transformer during intervals between...
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4390849 |
Audio power amplifier with class-D push-pull output stage
An audio power amplifier with class-D push pull output stage is disclosed using a "mixture" of pulse-width modulation and pulse-amplitude modulation and driving the class-D push pull output stage...
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4390846 |
Power amplifier connection
A power amplifier connection comprises a switching amplifier and a proportional amplifier. The output signal from the switching amplifier and the output signal from the proportional amplifier are...
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4383203 |
Circuit means for efficiently driving an electrodeless discharge lamp
In an electrodeless discharge lamp of the type including an ionizable medium within a sealed envelope capable of emitting radiant energy when subjected to a radio frequency field, an oscillator for...
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4369409 |
Low-frequency power amplifier
A compact and inexpensive LF power amplifier is disclosed. A plurality of pulse trains which are phase shifted relative to each other are width-modulated by an input LF signal. The modulated pulse...
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4347481 |
Pulse width modulated signal amplifier
A pulse width modulated signal amplifier includes a first DC voltage source having first and second terminals, first and second switching transistors each having a control electrode, the main...
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4336615 |
Linear loading for PWM filter
An AM broadcast transmitter uses a PWM modulator that requires a pulse width filter. It has been found that the filter load varies over the modulation cycle resulting in distortion. To overcome...
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4326170 |
High power and/or high voltage switching operational amplifier
There is disclosed a high power and/or high voltage switching operational amplifier arrangement having a comparator with a first input for a low frequency AC signal. The output of the comparator is...
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4240036 |
Linearized three-state switching amplifier
A pulse width modulated switching amplifier is provided for amplifying an analog signal. Means is provided for producing positive and negative signals representative of positive and negative...
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4182992 |
Pulse width modulated signal amplifier
A pulse width modulated signal amplifier includes first and second switching transistors and a diode which are connected in series across a DC power source and in the forward direction with respect...
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