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| Number | Title | Issue Date |
| 4191929 | Isolation amplifier with high linearity A transformer-coupled isolation amplifier which can accept signals over a wide dynamic range while maintaining very high linearity. An input signal is applied to an input winding of a transformer. The secondary winding of the isolation transformer is conn... | 03/04/1980 |
| 4188586 | Demodulator circuit for chopper amplifier In a demodulator circuit for a chopper amplifier including a rectifier and a smoothing filter having a capacitor, an impedance conversion circuit is connected to the output side terminal of the capacitor to ensure holding of the stored charges of the capa... | 02/12/1980 |
| 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 to the polarity of the DC power source, the diode being c... | 01/08/1980 |
| 4178556 | Class D amplifier system In a Class D amplifier system comprising a pulse width modulator for pulse width modulating with an audio signal a carrier signal having a frequency higher than that of the audio signal, an output switching amplifier connected to the modulator, and a lowp... | 12/11/1979 |
| 4178557 | Linear amplification with nonlinear devices The present linear amplifier uses nonlinear components where an input signal with amplitude and phase variations is concurrently applied to a limiter (41) and an envelope detector (42) which provide signals that serve as a carrier signal and a modulating ... | 12/11/1979 |
| 4172237 | Low distortion amplifier A transistor amplifier consisting of a modulated radio frequency generator and a detector circuit wherein the operating portion of the input-output curve of the radio frequency generator is a complement of the operating portion of the input-output curve o... | 10/23/1979 |
| 4167710 | Pulse width modulated signal amplifier with protective means A pulse width modulated signal amplifier comprises a DC power supply for rectifying an AC input voltage to produce a pair of DC voltages of opposite polarity, a pulse width modulated signal amplifying circuit supplied with a pulse width modulated signal t... | 09/11/1979 |
| 4164714 | Polyphase PDM amplifier A system wherein input signals are pulse duration modulated to provide a plurality of pulse trains having a predetermined phase relation therebetween. The plurality of pulse trains control the operation of separate switching elements. The output of the sw... | 08/14/1979 |
| 4162455 | Amplifier systems This invention relates to an amplifier system comprising two or more Class D amplifiers the outputs of which are associated with a common system output in a known manner. To avoid the appearance of spurious sidebands in the system output which are associa... | 07/24/1979 |
| 4153882 | High-efficiency amplifier This invention provides a method and means for amplifying signal waves with high efficiency that comprises signal sampling means operating at the Nyquist rate or greater, sample-quantizing means, a plurality of circuits that link the quantizing means to a... | 05/08/1979 |
| 4152660 | Isolation amplifier This relates to a transformer coupled isolation amplifier employing multiple primary and secondary windings to separate power supply currents from signal currents. An input section includes an input amplifier, a flyback modulator and a first flyback demod... | 05/01/1979 |
| 4152670 | Signal generator, especially for ringing current in telecommunication system A circuit arrangement for feeding a sinusoidal signal current to a wide range of loads, such as ringing current transmitted over subscriber lines from a telephone exchange, comprises a modulator which converts a rectified sine wave into a sequence of unip... | 05/01/1979 |
| 4144502 | Negative feedback amplifiers of PWM-type A negative feedback operation of a PWM-type amplifier is stabilized by the use of a resistor. The input signal is voltage-compared with the triangular wave of a higher frequency than the input signal to form a PWM-signal, which is, in turn, power amplifie... | 03/13/1979 |
| 4134076 | Pulse width modulated signal amplifier A pulse width modulated signal amplifier includes an integrator having a positive or non-inverted input terminal supplied with a modulating signal, such as, an audio signal, and an inverted input terminal supplied with a rectangular wave signal as a carri... | 01/09/1979 |
| 4124822 | Isolation amplifier A DC isolation amplifier having improved conductive isolation between its input and output. The amplifier includes an input section having a modulator and an output section having a demodulator and an oscillator section. The modulator and demodulator are ... | 11/07/1978 |
| 4122415 | AM transmitter with an offset voltage to the RF stage to compensate for switching time of the modulators An AM transmitter of the type including apparatus for generating a subcarrier signal, pulse width modulating this subcarrier with audio, amplifying this resulting pulse width signal using active devices operating in the more efficient switching mode is di... | 10/24/1978 |
| 4117411 | Isolation circuit with duty cycle feedback An isolation circuit with duty cycle feedback is disclosed which includes an operational amplifier with capacitive coupled negative feedback such that its output voltage varies to maintain its input terminals at the same potential, and which output is con... | 09/26/1978 |
| 4092608 | Electronic circuitry The present application relates to electronic circuitry for the improved handling of electric signals, particularly to the amplification thereof. The present application discloses an integral-amplifier that has a much higher efficiency than corresponding ... | 05/30/1978 |
| 4092610 | Modulated carrier amplifying system A system providing linear amplification of a signal including a pulse duration modulation of the signal upon a carrier signal, the system further including a plurality of amplifying units which are sequentially activated by the modulated carrier. The ampl... | 05/30/1978 |
| 4090147 | Interferometric amplifier Improved interferometric amplification is achieved by separating the input signal in accordance with the signal's projection on two orthogonal reference signals, with one of the reference signals capable of following the instantaneous frequency of the inp... | 05/16/1978 |
| 4075572 | Isolation amplifier having improved fidelity An isolation amplifier comprising three separate conductively-isolated sections: (1) an input section including an AC modulator, (2) an output section including a demodulator, and (3) an improved oscillator or AC power section for reducing the undesirable... | 02/21/1978 |
| 4066973 | Analog signal isolator Isolating apparatus is disclosed which provides electrical isolation between an analog signal input and an equivalent analog signal output. The input analog signal is converted to a series of positive and negative pulses. Optical coupling devices are resp... | 01/03/1978 |
| 4066974 | Isolation amplifier There is disclosed an isolation amplifier having an input amplifier, an output amplifier, a transformer having primary and secondary windings, an alternator connected to the secondary winding of the transformer for alternately presenting a voltage and a h... | 01/03/1978 |
| 4059807 | Pulse width modulated amplifier A pulse width modulation circuit which comprises a mixer for combining an input audio signal with a feedback signal and for developing a difference signal to feed to an integration circuit. The integration circuit is coupled to a pulse width modulator whi... | 11/22/1977 |
| 4050028 | High voltage amplifier A first operational amplifier feeds a DC signal to first and second inverter means which are operated in opposite senses of polarity and which convert the DC output signal of the first operational amplifier to first and second stepped-up differential AC v... | 09/20/1977 |
| 4042890 | High efficiency electrical power conditioner An A.C. powered amplifier for converting low power information input signals to corresponding signals of a substantially increased power level without requiring a power transformer. A signal processor having a low power information signal input and a feed... | 08/16/1977 |
| 4031480 | Circuit arrangement for the ungrounded transmission of signals through testing points in communication systems A circuit arrangement for the ungrounded transmission of signals through testing points in communication systems with the aid of high-frequency oscillations. The high-frequency oscillations are controlled on the one side of the testing point and are recti... | 06/21/1977 |
| 4021745 | Pulse width modulated signal amplifier A pulse width modulated signal amplifier includes a first input terminal supplied with a rectangular wave signal as a carrier, a second input terminal supplied with a modulating signal, such as an audio signal, an integrator supplied with both the rectang... | 05/03/1977 |
| 4016501 | Switching amplifier system A switching amplifier includes a pulse width modulator for converting a bipolar input signal, which may be a speech signal, into a train of unipolar pulses having durations which vary with the instantaneous absolute amplitude of the input signal. The puls... | 04/05/1977 |
| 4015213 | Pulse width modulated signal amplifier A pulse width modulated (PWM) signal amplifier includes an input terminal supplied with an input signal to be modulated, a sawtooth wave generator, and a first amplitude comparator supplied with the input signal and with the output signal of the sawtooth ... | 03/29/1977 |
| 4004246 | Pulse width modulated signal amplifier A pulse width modulated signal amplifier system includes a signal input circuit, an amplifier for receiving an input signal from the signal input circuit, a pulse width modulator for receiving an output signal from the amplifier and producing a pulse widt... | 01/18/1977 |
| 4000473 | Isolation amplifier Disclosed is an isolation amplifier, wherein a DC input signal is applied to the primary winding of a saturable reactor, the secondary winding of which is coupled with an oscillating circuit so as to supply the secondary circuit with a high-frequency curr... | 12/28/1976 |
| 3999143 | Pulse width modulated signal amplifier A pulse width modulated signal amplifier includes a pair of transistors, each having a base, an emitter, and a collector. The bases are supplied with a pulse width modulated signal to be amplified, and the emitters are connected to each other and to an ou... | 12/21/1976 |
| 3988690 | Amplifier circuit having a floating input stage An input amplifier stage is isolated from the main body of an amplifier and instrument ground by a single transformer which provides both an energy path to the input stage and an amplifier signal path from the input stage using a modulated load technique.... | 10/26/1976 |
| 3982196 | Differential voltage amplifier A differential voltage amplifier having high gain and a wide bandwidth essentially comprises an unstable circuit having one position of unstable equilibrium and two distinct positions of equilibrium which can be maintained for a given period of time, an i... | 09/21/1976 |
| 3976955 | Protective circuit for pulse width modulated signal amplifier A protective circuit for a pulse width modulated signal amplifier includes a signal input circuit, a carrier signal generator, a pulse width modulator for receiving both the output signals of the signal input circuit and the carrier signal generator and f... | 08/24/1976 |
| 3963992 | Linear AGC circuit with controlled duty cycle sampling means An intermodulation distortion analyzer generates two pairs of sinusoidal test tones to serve as a test signal for the channel under test. The two pairs of tones simulate two respective noise band test signals but eliminate the long time averaging required... | 06/15/1976 |
| 3956707 | Floating measurement amplifier A floating measurement amplifier comprising an emitter and a receiver ferromagnetically coupled but totally separated from each other galvanically, the emitter comprising a modulator feeding the primary winding of a signal transformer and a feed device fe... | 05/11/1976 |
| 3947779 | Input bias and signal conditioning circuit with overload indication for differential amplifiers There is disclosed a circuit arrangement of a bipolar device connected in a circuit arrangement with unidirectional conducting devices connected between the input terminals of a differential amplifier for biasing purposes and a simplified electromagnetica... | 03/30/1976 |
| 3946324 | Isolation amplifier An isolation amplifier comprising three separate, conductively-isolated sections: (1) an input section including an AC modulator, (2) an output section including a demodulator, and (3) an oscillator section. The AC signal from the oscillator section is tr... | 03/23/1976 |
