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| Number | Title | Issue Date |
| 7863978 | RF amplifier system for neutralizing internal capacitance in a cavity An RF amplifier system having closed cavity containing an amplifying device that includes at least a cathode, an anode and a grid and wherein the amplifying device exhibits an internal grid-to-anode capacitance. Apparatus is presented for use in neutralizing the int... | 01/04/2011 |
| 7489192 | Low-noise amplifiers A low-noise amplifier, that utilizes multiple monolithic transformer magnetic feedback to simultaneously neutralize the gate-drain overlap capacitance of the amplifying transistor and achieve high gain at high frequencies when driving an on-chip capacitance, is show... | 02/10/2009 |
| 7432764 | Push-pull amplifier with transformational negative feedback The push-pull amplifier with transformational negative feedback is provided for amplification of variable electrical signals. It includes a signal input and a signal output, a transformational negative feedback connected with the signal input and the signal output a... | 10/07/2008 |
| 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 |
| 6639467 | Alternating current derived from direct current Continuous alternating current is derived from a differential operational amplifier supplied by direct current. The differential operational amplifier produces alternating current located on the positive input of the differential operational amplifier. Ou... | 10/28/2003 |
| 6566947 | Combined active impedance and filter in line drivers A line driver combining active impedance and filter in one stage for connection to a transmission line having a characteristic impedance. The line driver comprises an amplifier, a transformer with a primary to secondary winding ratio of 1:n, a reference i... | 05/20/2003 |
| 5164682 | Two-port wideband bipolar transistor amplifiers A wideband amplifier comprises a dual-emitter bipolar transistor arrangement with coaxial transformers, each having a high turns ratio and tight coupling between a first toroidal winding on an annular ferrite core and a second, single-turn, winding consti... | 11/17/1992 |
| 4777430 | Circuit for determining the effective series resistance and Q-factor of capacitors A meter circuit for measuring the effective series resistance (ESR) and Q-Factor of a capacitive device has an operational amplifier with an input to which a source of AC input voltage is applied. A feedback circuit is connected between output and input o... | 10/11/1988 |
| 4598212 | Driver circuit A driver circuit for applying a first signal having a desired wave form, frequency and peak to peak voltage to a coaxial transmission line which also has applied to it a second signal having a substantially higher frequency. An operational amplifier has t... | 07/01/1986 |
| 4590434 | High dynamic range amplifier with low noise and low distortion An amplifier uses non-dissipative elements to provide current and voltage feedback. The base amplifier has two input terminals, and the current and voltage feedback signals are applied to respective input terminals. The non-dissipative elements may be eit... | 05/20/1986 |
| 4567443 | Low-distortion audio amplifier circuit arrangement In amplifier circuit arrangements for low-distortion transmission of audio signals a transformer is provided in order to isolate a source circuit from an amplifier of the amplifier circuit arrangement. Good transmission characteristics, however, can only ... | 01/28/1986 |
| 4414690 | Active aerial An active aerial for use in car radios and aerial "arrays" comprising an aerial element and an aerial connected thereto. In order to obtain a low distortion and a good signal-to-noise ratio in spite of the presence of protection diodes to prevent overload... | 11/08/1983 |
| 4253070 | Feedback arrangement An arrangement to provide feedback to amplifier systems incorporating an electrical load. A current transformer in conjunction with a resistor is incorporated to provide a feedback correction signal to an amplifier which corrects for distortion caused by ... | 02/24/1981 |
