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| Number | Title | Issue Date |
| 8022762 | Multi-stage CMOS power amplifier There is provided a multi-stage CMOS power amplifier including: a driver amplifier having differential output terminals, inverting differential signals input through first and second input terminals and outputting the respective inverted signals through the differen... | 09/20/2011 |
| 7414481 | Receiver with colpitts differential oscillator, colpitts quadrature oscillator, and common-gate low noise amplifier Embodiments of the present invention include a common-gate amplifier having an input terminal and an output terminal, a transistor having a source, a drain, and a gate, four inductors, and two capacitors, and a negative amplification circuitry. The negative amplific... | 08/19/2008 |
| 7405619 | Amplification circuit improved with linearity and frequency converter using the same Provided is a frequency converter using an amplification circuit that is improved with linearity by coupling a main transistor and an auxiliary transistor in parallel. An amplification circuit that is improved with linearity comprises an input block amplifying an in... | 07/29/2008 |
| 7372327 | Input structure for a power amplifier and associated methods A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 05/13/2008 |
| 7348845 | System and method for employing variable magnetic flux bias in an amplifier A system and method for employing variable magnetic flux bias in an amplifier. The amplifier system comprises an output transformer and a magnetic sensor configured to sense a first magnetic flux of the output transformer. The magnetic sensor generates a flux signal... | 03/25/2008 |
| 7342754 | Bypass circuit to prevent arcing in a switching device A device is provided for preventing arcing between contacts of a switching device as the contacts of the switching device are opened. The device includes a coil suppression circuit connected in parallel with the coil. The coil suppression circuit dissipates the ener... | 03/11/2008 |
| 7315212 | Circuits and methods for implementing transformer-coupled amplifiers at millimeter wave frequencies Circuits and methods are provided for building integrated transformer-coupled amplifiers with on-chip transformers that are designed to resonate or otherwise tune parasitic capacitances to achieve frequency tuning of amplifiers at millimeter wave operating frequenci... | 01/01/2008 |
| 7288989 | Low-noise amplifier with a transformer An amplifier circuit includes a transistor having a control terminal, a first and a second terminal, a signal input terminal coupled to the control terminal of the transistor, as well as a transformer with a primary side and a secondary side, the primary side of whi... | 10/30/2007 |
| 7233199 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 06/19/2007 |
| 7193458 | Power supply for guitar amplifier A power supply for a guitar amplifier and the guitar amplifier and method of operating the guitar amplifier. The power supply includes an alternating current power input having a secondary winding and a filament winding, an output and a first vacuum tube rectifier c... | 03/20/2007 |
| 7174261 | Power line sensors and systems incorporating same An apparatus for sensing the current in a power line of a power system and systems incorporating the apparatus are disclosed. The apparatus may comprise an enclosure providing a window operable to permit the passage of the power line therethrough. The apparatus may ... | 02/06/2007 |
| 7161427 | Input structure for a power amplifier and associated methods A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 01/09/2007 |
| 7123090 | Low-noise preamplifier, in particular, for nuclear magnetic resonance (NMR) A low-noise preamplifier with an electronic amplifying element having an input (2) and an output (4), and with a first transformer (6) having a primary winding (5) and a secondary winding (8) is characterized in that the input (... | 10/17/2006 |
| 7113045 | Power amplifier input structure having a differential output A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 09/26/2006 |
| 7064605 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 06/20/2006 |
| 7053714 | Methods and apparatus for switching between class A and A/B operation in a power amplifier Methods and apparatus contemplate: an output transformer having at least first and second separate primary windings and at least one secondary winding, each winding including a first (in phase) end and a second (out of phase) end; at least first and second active el... | 05/30/2006 |
| 7030689 | Isolated DC-to-DC converter An isolated direct-current to direct-current (DC-to-DC) converter and associated method are provided which employ a class-D amplifier. An alternating current (AC) input voltage and a DC input voltage drive the class-D amplifier to produce an AC primary voltage. The ... | 04/18/2006 |
| 6737916 | RF amplifier system having improved power supply An RF amplifier system having improved power supply is presented and which includes a plurality of power amplifiers each having an output circuit for connecting a DC voltage source to one of a plurality of primary windings located on a first transformer. The first t... | 05/18/2004 |
| 6731166 | Power amplifier system with multiple primary windings The invention provides a power amplifier system including a plurality of amplifiers, a plurality of primary transformer windings, a single secondary transformer winding. Each of the plurality of amplifiers includes a differential input that is commonly coupled to a ... | 05/04/2004 |
| 6724250 | Transformer of power-amplifier module for an audio device A transformer of power-amplifier module for an audio device includes a casing having a first plug and a second plug formed thereon. In the casing, there is an amplifying circuit having an input electrically connected to the first plug and an output electrically conn... | 04/20/2004 |
| 6653905 | Amplifier for FM antennas An amplifier comprising a transformer and a plurality of FETs, for example, three FETs. An input terminal, which receives a signal from an FM antenna, is connected to one end of the primary winding of the transformer. A power-supply voltage is applied to ... | 11/25/2003 |
| 6424227 | Monolithic balanced RF power amplifier An integrated RF power amplifier 20 includes an on-chip input transformer (24) and an on-chip output transformer (28). Each of the transformers (24, 28) is formed from four spirals. Each primary winding (34, 42) and each secondary winding (38, 44) include... | 07/23/2002 |
| 6359505 | Complementary pair-configured telecommunication line driver having synthesized output impedance A synthetic impedance line driver for driving a telecommunication line includes a complementary operational amplifier pair having cross-coupled positive feedback summing resistors. The driver circuit is configured to provide a relatively large multiplicat... | 03/19/2002 |
| 6294955 | Apparatus and method for use in disconnecting and/or replacing one of a plurality of power amplifiers in a transmitter while the transmitter is operating Apparatus and method are presented for use in disconnecting and/or replacing one of a plurality of M power amplifier modules in an RF transmitter while the transmitter is operating. Each amplifier module has first and second outputs that normally are conn... | 09/25/2001 |
| 6252460 | FET balun transformer An inventive FET balun transformer uses a positive power supply alone, not a negative one, thus downsizing a device including the balun transformer. In the FET balun transformer, a voltage supplied from the positive power supply is divided by a voltage di... | 06/26/2001 |
| 6172563 | Lossless feedback transistor amplifiers with linearity augmentation A lossless feedback transistor amplifier circuit is described, including an input terminal and an output terminal, for the purpose of amplifying a signal voltage. The amplifier circuit also includes an augmentation circuit, connected from the emitter to t... | 01/09/2001 |
| 6133790 | In-line, unbalanced amplifier, predistortion circuit A plurality of amplifiers are connected in cascade to form an in-line predistortion circuit. The amplifiers are unbalanced in that each amplifier stage in the circuit has two DC voltage rails which are independently controlled to provide different, i.e. o... | 10/17/2000 |
| 5450038 | Intermediate frequency amplifier and a telecommand signal receiver having such an amplifier An electronic device, for example a signal receiver mounted on a vehicle for opening and closing the doors of the vehicle in response to telecontrol signals from a remote source, includes an intermediate frequency amplifier. The intermediate frequency amp... | 09/12/1995 |
| 5404113 | High efficiency power amplifier A high-efficiency amplifier (10, 18) that may be used in, for example, a radar system to amplify signals received at an exciter (22) before they are applied to an antenna (20). The amplifier includes, among other components, an adaptive matching network (... | 04/04/1995 |
| 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 difference of signals. The circuit appears to be a resistive load... | 09/06/1994 |
| 5187446 | Feedback isolation amplifier An isolation amplifier employs feedback to accurately amplify an input signal while maintaining electrical isolation between the input and output signals. The isolation amplifier consists of an amplitude modulator, an isolation transformer having a pair o... | 02/16/1993 |
| 5179461 | Broadband optical receiver with passiner tuning network This optical receiver is capable of receiving broadband R-F modulated signals transmitted over fiber-optic cable. The receiver comprises a photodiode impedance matched to the input of an low noise, low distortion amplifier by an impedance matching transfo... | 01/12/1993 |
| 4891536 | Solid state switch An electronic switching arrangement is shown to consist of an effective balanced pi configuration using series and shunt FETs and transformer coupling so that the impedances seen by such FETs are optimized.... | 01/02/1990 |
| 4884038 | Transconductance amplifier with transformer coupled forward feed A transconductance amplifier for emitting an output current that is a replica of a input voltage has its accuracy enhanced by a current comparator having a first magnetic core, a second magnetic core, a pair of ratio windings electromagnetically coupled w... | 11/28/1989 |
| 4659981 | Input transformer circuit An input transformer circuit in which transformer-isolated, balanced inputs are provided operates with low distortion and employs a transformer that has an equal number of turns in the primary and secondary windings and which is operated in the current mo... | 04/21/1987 |
| 4435686 | Extended cascode amplifier Disclosed is a cascode amplifier circuit with improved current gain, linearity, overload performance and bandwidth which uses a step-down (of voltage) transformer between a driver stage and an output stage. One end of the primary of the transformer is con... | 03/06/1984 |
| 4383222 | Half-wave signal isolator with compensator means to reduce temperature-dependent effects A signal isolator including a coupling transformer with modulate/demodulate switches in series with the primary and secondary windings. The switches are driven in synchronism by an oscillator. Resonating capacitors are connected in parallel with the trans... | 05/10/1983 |
| 4270061 | Current transformer input system for AC conversion devices An improved input system for isolating resolver or synchro outputs from inputs to demodulators or analog-to-digital converters uses current transformers rather than voltage transformers. The resistances of resistors connected in series with the primary wi... | 05/26/1981 |
| 4208633 | Current supply branching arrangement for separation of signal and supply currents A current branching circuit for an amplifier for first and second input terminals and a current supply feed terminal comprising a pair of magnetically coupled windings with one of the windings connected between the center conductor of a coaxial feed line ... | 06/17/1980 |
| 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 |
