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| Number | Title | Issue Date |
| 8149053 | Low noise amplifier The present invention relates to a low noise amplifier comprising a transformer, a first amplifier and a feedback resistor, the transformer comprising a primary stage and a secondary stage. The secondary stage is connected to the input of the first amplifier and the... | 04/03/2012 |
| 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 |
| 7005920 | Programmable passive inductor A programmable passive inductor includes two inductors or coils, each having a self-inductance, magnetically coupled together and having a mutual inductance proportional to a magnetic coupling factor. The relative magnitude of the currents through the two inductors ... | 02/28/2006 |
| 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 |
| 6603352 | Switched-mode power amplifier integrally performing power combining A switched-mode power amplifier is configured for performing power amplification of a plurality of signals input thereto and integrally summing (combining) those signals. Conceptually, this is achieved by replacing the center-tapped input winding componen... | 08/05/2003 |
| 5838196 | Transformer-coupled amplifier A transformer-coupled amplifier includes a driver transformer in which a primary winding, a secondary winding, and a tertiary winding are wound on a core of a magnetic circuit, a drive signal source for supplying an AC drive signal superposed with a drive... | 11/17/1998 |
| 5541482 | Electrodeless discharge lamp including impedance matching and filter network An impedance matching and filter network is disclosed. The network performs two preselected impedance transformations and provides a filtering function to attenuate harmonics of an electrical signal delivered at an input of the network. The network may ad... | 07/30/1996 |
| 5264803 | Amplifier circuit with increased voltage handling capacity A system for increasing the voltage handling capacity of an amplifier circuit coupled to a transformer output comprises a transformer secondary winding divided into n sub secondary windings, where n is an integer. A first terminal of a first of the sub se... | 11/23/1993 |
| 4968949 | Ohmically isolating input circuit An ohmically isolating input circuit accepts a three pin connector of a cable from a signal source output for virtually all three pin connector standards, and will output a signal of the same voltage regardless of which of the three pin connector standard... | 11/06/1990 |
| 4779058 | Ohmically isolated input circuit An ohmically isolated input circuit accepts a three pin connector of a cable from a signal source output for virtually all three pin connector standards, and will output a signal of the same voltage gain regardless of which of the three pin connector stan... | 10/18/1988 |
| 4531101 | High-frequency amplifier with enhanced gain from use of the Miller effect capacitance The Miller effect capacitance of an amplifying device, such as a transistor, is effectively used to increase the gain and/or the high-frequency cut-off point in the band width of a relatively high-frequency amplifier. The transistor or equivalent amplifyi... | 07/23/1985 |
| 4379996 | Enhancement of class C operation of bipolar junction transistor Pulsed RF operation of a class C biased BJT is enhanced using a three element system to control the BJT emitter current. The three element system includes a transformer having a secondary connected in the emitter current path. Connected to the transformer... | 04/12/1983 |
| 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 |
| 4035738 | Low noise amplifier A low-noise, stage-stabilized, direct-coupled, single-ended amplifier cirt is disclosed which has a unique feedback network combined therewith in such manner that degenerative alternating current and substantially constant direct current feedback signals... | 07/12/1977 |
| 4005372 | Frequency tunable microwave apparatus having a variable impedance hybrid idler circuit A frequency tunable microwave apparatus including a semiconductor TRAPATT diode generating a microwave signal at its fundamental, second and third harmonic frequencies. Energy is extracted at the second harmonic frequency and a certain impedance loading i... | 01/25/1977 |
| 3997852 | RF amplifier An R. F. wide band amplifier is disclosed. It comprises a high impedance step up transformer at the input end, a wide band high impedance J-Fet attenuator connected to the step up transformer, a dual gate MosFet amplifier connected to the attenuator and a... | 12/14/1976 |
