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| Number | Title | Issue Date |
| 4613823 | Multi-stage signal transmitting system In a multi-stage signal transmitting system whose amplification is electronically adjustable and wherein undesired temperature influence on the amplification is compensated, the amplification adjustment is effected by a stage and the temperature variation... | 09/23/1986 |
| 4607234 | Gain-controlled amplifier arrangement Gain-controlled amplifier arrangement with a cascade arrangement of first and second gain-controlled amplifier stages, an AM-detection circuit and an integrating arrangement for generating a control voltage for the two stages and a threshold circuit for g... | 08/19/1986 |
| 4598252 | Variable gain power amplifier A power amplifier having plural parallel amplification circuits of different gains selectively actuable to zero and maximum gains, and electronic switches to select a circuit for connection to a common output junction.... | 07/01/1986 |
| 4591805 | Adaptive bandwidth amplifier An amplifier exploits Miller-effect capacitance in a cascaded multi-stage self-limiting amplifier arrangement to achieve automatic adaptive bandwidth behavior (without the use of an active feedback control loop). The Miller-effect capacitance varies in ac... | 05/27/1986 |
| 4574252 | Constant rise AGC device The invented device provides automatic gain control (AGC) of incoming sigs over a large dynamic range of input levels with a constant rise time. The constant rise AGC device includes a primary AGC loop for receiving the incoming or input signal and split... | 03/04/1986 |
| 4558289 | Bias and AGC control of two RF amplifiers with a shared control element A plurality of common emitter transistor amplifiers have the output of a single operational amplifier applying an AGC signal to their bases. An input of the operational amplifier is connected to the collectors through respective diodes to isolate and to s... | 12/10/1985 |
| 4551688 | Delay compensated automatic gain control There is disclosed a delay compensated automatic gain control which allows improved automatic gain control in analog and digitally implemented systems. The AGC system and technique includes a primary high speed control loop implemented after the intermedi... | 11/05/1985 |
| 4549152 | Broadband adjustable phase modulation circuit A phase modulation circuit to provide at an output terminal an output signal controllably shifted from 0° to 360° relative to an input signal provided at an input terminal includes a first 90° coupler connected between the input terminal and second and... | 10/22/1985 |
| 4528516 | Differential amplifier with dynamic thermal balancing A differential amplifier is provided with means to control the collector-to-emitter voltage thereof proportionately with quiescent current therethrough to dynamically maintain thermal balance therebetween when the gain setting is changed.... | 07/09/1985 |
| 4525789 | Programmable network tester with data formatter A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be tested. Computer (200) stores information about each subscr... | 06/25/1985 |
| 4525684 | Auto-equalizer apparatus An auto-equalizer for passing data pulses of the type which tries to restore the relative amplitude of the first and third harmonics of the data signal frequency while deemphasizing the amplitude of other higher harmonics. The present invention accomplish... | 06/25/1985 |
| 4518925 | Signal processing circuits A signal processing circuit comprises an amplifying circuit portion having an input terminal connected to a signal source, an output terminal for delivering an amplifier signal therefrom and a control terminal, a capacitive device coupled to the control t... | 05/21/1985 |
| 4513253 | Electronic amplifier having a transmission factor that is variable by means of a controllable voltage, specifically an expander An electronic amplifier having a transmission factor which can be varied by means of a control voltage, specifically an expander. A switch is provided for selective operation of the amplifier with a fixed control voltage or with a variable control voltage... | 04/23/1985 |
| 4511813 | Dual-gate MESFET combiner/divider for use in adaptive system applications A dual-gate MESFET forms the basic building block for a variety of signal coupling applications for use in adaptive microwave communication systems. By controlled biasing of its electrodes, a dual-gate MESFET may be operated as an active signal combiner/d... | 04/16/1985 |
| 4494212 | Variable gain amplifier A variable gain amplifier with digital output is described. The amplifier is useful for but not limited to input range selection in chart recorders or other measuring instruments. To minimize the number of expensive presision resistors used in the gain se... | 01/15/1985 |
| 4492930 | Automatic gain control system A system in which automatic gain control is not applied to modify an incoming carrier signal over the first 40 dB of signal level, employs an AGC system in which a further signal is generated for further modification of the modified carrier signal to obta... | 01/08/1985 |
| 4492926 | Amplitude modulation detector The amplitude modulation detection device, which is provided with an AM (amplitude modulation) responsive to first and second input signals for maintaining a constant D.C. level output signal, the first signal being the AM signal, and the second signal pr... | 01/08/1985 |
| 4490687 | Electronic amplifier An electronic amplifier composed of an electronically controllable amplifier element having a control input for receiving a voltage the value of which determines the gain of the element, with one such value being a predetermined basic gain value of the am... | 12/25/1984 |
| 4489281 | Automatic gain control amplifier left at an optimum gain after an end of a digital input signal In an automatic gain control amplifier circuit for an intermittent sequence of digital input signals, a signal detector detects presence and absence of the digital input signal in the sequence to produce a presence signal which takes a presence and an abs... | 12/18/1984 |
| 4482973 | Digital automatic gain control circuit A digital automatic gain control circuit provided with a first AGC loop and a second AGC loop; activated alternately. The first AGC loop is activated when an input signal is initially supplied. The loop produces a certain digital value calculated as an in... | 11/13/1984 |
| 4481477 | Method and apparatus for the real-time measurement of the small signal gain of an amplifier A method and apparatus for measuring the small signal gain of an amplifier. Each amplifier responds, in operation, to a small signal input. The small signal input varies substantially linearly over a field time interval. A small bias signal is added to th... | 11/06/1984 |
| 4477780 | Operational amplifier with multiple switchable outputs The disclosed operational amplifier comprises a first pair of complementary type transistors that have their emitter-collector paths connected in series across a source of reference potential. The emitters of the transistors are connected together and to ... | 10/16/1984 |
| 4473802 | Electrical signal converter with step variable gain An electrical signal converter with step variable gain comprises a variable gain circuit having its control inputs connected to the outputs of a sequencer for varying the gain of the variable gain circuit according to a step function of time. A negative f... | 09/25/1984 |
| 4468631 | Amplitude control apparatus The DC component of an input signal is regulated at a constant amplitude to provide a resultant signal that is coupled to an output node via variable transmission means to provide a processed output signal. Feedback control means, coupled to the variable ... | 08/28/1984 |
| 4464633 | Amplifier incorporating gain distribution control for cascaded amplifying stages A pair of differential amplifier stages are connected in cascade to form a multistage amplifier for signal amplification purposes. The base-emitter paths of current source transistors which establish the operating currents for the respective stages are co... | 08/07/1984 |
| 4459556 | Field effect transistor A dual gate Schottky barrier gate GaAs FET with improved cross-modulation characteristics when used in a UHF gain controlling tuner, having a value of 40 mA or smaller of a drain to source saturation current, the improvement of the FET is that length of a... | 07/10/1984 |
| 4455535 | Frequency characteristic adjusting apparatus Frequency characteristic adjusting apparatus used in sound apparatus or the like, in which an input signal is divided into first and second frequency bands after being amplified, the gain of the signal of the first frequency band controlled by first and s... | 06/19/1984 |
| 4454433 | Multiplier circuit The invention relates to an improved voltage control amplifier of the type comprising a gain cell. The gain cell is of the type that includes at least one log transistor for each polarity of input signal and at least one antilog transistor for each log tr... | 06/12/1984 |
| 4451797 | AGC Controller for pulsed system This invention relates to automatic gain control (agc) circuitry and more particularly to circuitry for supplying respective automatic gain control signals to an amplifier that repeatedly receives a given sequence of signals. Each one of the signals in ea... | 05/29/1984 |
| 4451801 | Wideband linear carrier current amplifier An amplifier suitable for carrier current line driver applications is shown. It includes a triangle wave to sine wave shaper circuit and an automatic level control. It incorporates a line surge arrestor circuit that is active even when the transmitting ca... | 05/29/1984 |
| 4438410 | Variable gain amplifier A variable gain amplifier apparatus utilizing an amplifier in conjunction with a signal detector and a charge storage device to establish a DC bias voltage which controls the threshold level of the input signal amplifier to maintain a constant input/outpu... | 03/20/1984 |
| 4437070 | Amplifier arrangement whose overall gain is controllable by means of a control voltage Volume control circuits generally vary the overall gain of a low-frequency amplifier by varying the gain in a negative-feedback branch. At very high gain, at which very large output signals are obtained, the negative-feedback is then very small, which may... | 03/13/1984 |
| 4426625 | Circuit for linearly gain controlling a differential amplifier A circuit for linearly controlling the gain of a differential amplifier includes a differentially connected current splitter network biased by means of a symmetrical bias circuit coupled to a common operating potential and including first and second curre... | 01/17/1984 |
| 4424494 | Automatic gain control circuit An automatic gain control circuit is disclosed which is direct coupled to phase opposed outputs of an IF amplifier and provides a DC control voltage for controlling the gain of the amplifier. The AGC circuit includes a peak-to-peak threshold detector and ... | 01/03/1984 |
| 4422051 | Gain control circuit A gain control circuit particularly suitable for compressing or expanding the dynamic range of an audio signal, and thereby reducing noise produced during recording and playback comprises an input circuit receiving an input signal, first and second differ... | 12/20/1983 |
| 4417240 | Plural output switched current amplifier as for driving light emitting diodes A plural-output switched current source, as may be used to provide current drive to inidividual display segments of an LED display. Each respective current source output is selectively operable from a respective low level I2 L signal source. Me... | 11/22/1983 |
| 4415866 | Circuit for dynamic compression and/or expansion In a circuit for the automatic dynamic compression or expansion of a signal, the circuit presenting a useful signal path containing a first variable gain member which is electronically controllable for varying the transmission factor between the circuit i... | 11/15/1983 |
| 4403199 | Gain control systems An improved gain control circuit of the "eight transistor gain cell" type is disclosed. The improvements comprise (1) means for operating the circuit as a Class AB amplifier and (2) means for reducing the distortion component in the output signal due to t... | 09/06/1983 |
| 4398261 | Device for measuring the level of a variable signal with logarithmic conversion A device for measuring the level of a variable signal delivered by a sensor. It comprises a series of attenuators, receiving the signal from the sensor, a squaring and integrating chain for converting the value of the signal delivered by the attenuators i... | 08/09/1983 |
| 4384260 | Device for switching on and off and adjusting the volume of communications equipment, such as transceivers Improved apparatus for switching on and off and adjusting the volume of communications equipment employs a non-latching button, a delay element for producing a time delay determined by the pressure time on the button, a volume adjusting device for adjusti... | 05/17/1983 |
