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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 7768354 | Radio-frequency power amplifier A bias circuit operable to supply a bias current to a first transistor includes: a second transistor having a collector terminal connected to a first power supply; a first resistance element having one end connected to an emitter terminal of the second transistor an... | 08/03/2010 |
| 7391829 | Apparatus, system and method for receiver equalization In some embodiments, a frequency dependent gain circuit is coupled to an output of an amplifier. The gain circuit provides at least two ranges of frequency dependent gain characteristics in response to the output of the amplifier. A control circuit provides one of t... | 06/24/2008 |
| 7391269 | Amplifying circuit The invention provides an amplifying circuit for reducing electric power consumption at a standby mode time. Therefore, in DMOS and NMOS transistors constituting a cascode amplifier, the gate of the DMOS transistor of an initial stage is biased to a grounding voltag... | 06/24/2008 |
| 7386075 | Apparatus for and method of optimizing the performance of a radio frequency receiver in the presence of interference An apparatus for and method of extending the dynamic range of a RF communications receiver. The invention provides a mechanism for controlling the gain of both the LNA and down conversion mixer in the front end portion of an RF receiver. Both the LNA and the mixer a... | 06/10/2008 |
| 7016664 | Mixer circuit arrangement and an image-reject mixer circuit arrangement A mixer circuit arrangement 30 comprises a complementary transconductor circuit 31 and a mixer stage 32. The complementary transconductor circuit 31 includes two paths in parallel between a positive supply voltage VDD and ground G and is ... | 03/21/2006 |
| 7012464 | Method and circuit for a dual supply amplifier A circuit and method for bridging an analog signal between two integrated circuits operating at different supply voltages. The circuit is a two stage fixed gain amplifier. The first stage is a transconductance amplifier and the second stage is an operational amplifi... | 03/14/2006 |
| 6828854 | Method and circuit for a dual supply amplifier A circuit and method for bridging an analog signal between two integrated circuits operating at different supply voltages. The circuit is a two stage fixed gain amplifier. The first stage is a transconductance amplifier and the second stage is an operational amplifi... | 12/07/2004 |
| 6737915 | Tube input JFET output (TIJO) zero feedback audio amplifier A hybrid preamplifier with a vacuum tube input stage driving a JFET output stage dubbed TIJO (for Tube Input JFET Output) that uses zero feedback circuitry and a common low voltage B+ power supply. A single output low voltage transformer provides all necessary volta... | 05/18/2004 |
| 6300669 | Semiconductor integrated circuit device and method of designing same A semiconductor integrated circuit device comprises a multiple-stage amplifier including a plurality of transistors. The multiple-stage amplifier has a first stage comprising a plurality of bipolar transistors each having a single emitter structure. The b... | 10/09/2001 |
| 6043714 | Power amplifier incorporating heterojunction and silicon bipolar transistors A power amplifier including an amplifier stage including a heterojunction bipolar transistor for signal amplification having a base electrode connected to an RF signal input terminal, and a grounded emitter electrode; and a bias circuit including a silico... | 03/28/2000 |
| 5977571 | Low loss connecting arrangement for photodiodes Each of a plurality of photodiodes forming a photodetector is mounted on a respective metal pad on the surface of a semiconductor integrated circuit chip including a corresponding number of amplifier circuits for detecting the photocurrent from respective... | 11/02/1999 |
| 5854718 | Record amplifying circuit for respectively serially and differentially driving sets of series-connected sound and video record heads A DC feed-back circuit for causing a DC voltage of an external transistor in which an output bias current of a record amplifier flows to be equal to a DC voltage of an output terminal is provided so as to decrease power consumption. Thus, a plurality of r... | 12/29/1998 |
| 5701103 | Amplifying circuit with DC voltage feedback to base terminal for magnetic record and playback apparatus A DC feed-back circuit for causing a DC voltage of an external transistor in which an output bias current of a record amplifier flows to be equal to a DC voltage of an output terminal is provided so as to decrease power consumption. Thus, a plurality of r... | 12/23/1997 |
| 5623230 | Low-offset, buffer amplifier A unity gain or buffer amplifier having a low offset voltage. The amplifier uses two emitter followers of different conductivity types (PNP and NPN) in an up-down emitter or voltage follower configuration to provide high input impedance and low output imp... | 04/22/1997 |
| 5574403 | Simple high speed precision transconductance amplifier circuits A simple high speed precision transconductance amplifier circuit having a low offset. The circuit uses as an input stage two substantially identical transistors of a first conductivity type connected in series so as to have the same current there through,... | 11/12/1996 |
| 5498885 | Modulation circuit An integrated circuit is provided with particular application for high frequency modulation circuits, such as a mixer circuit, with reduced noise and gain. The circuit provides a novel application of a single device comprising a 4 or 5 terminal, gate cont... | 03/12/1996 |
| 5469093 | Current mirror drive circuit with high breakdown voltage A drive circuit comprises a plurality of current mirrors connected in series at their output-current end with a load resistor between two power rails. The input halves of the mirrors are driven by respective groups of series-connected input transistors, t... | 11/21/1995 |
| 5463350 | Biasing circuit of an amplifier A biasing voltage is supplied from the emitter of an emitter follower npn transistor. The base current of the npn transistor is supplied from the emitter of an emitter follower pnp transistor. Thus, a constant biasing voltage which is not influenced by an... | 10/31/1995 |
| 5446414 | Simple high speed precision transconductance amplifier circuits A simple high speed precision transconductance amplifier circuit having a low offset. The circuit uses as an input stage two substantially identical transistors of a first conductivity type connected in series so as to have the same current there through,... | 08/29/1995 |
| 5278516 | Buffer circuit A buffer circuit provided with a transistor each on the input and output terminal sides, in which the transistor has been provided in order to keep constant a difference between a collector-emitter voltage of the input terminal side transistor and that of... | 01/11/1994 |
| 5023570 | Emitter-follower circuit An emitter-follower circuit includes a bipolar transistor of a first conductivity type operating as an emitter-follower transistor and a bipolar transistor of a second conductivity type operable as a clamping transistor. The voltage developed between the ... | 06/11/1991 |
| 4939254 | Template synthesis of macrocyclic catecholamide complexes A method is provided for a high yield template synthesis of macrocyclic catecholamide ligands.... | 07/03/1990 |
| 4628281 | Feedback amplifier with reduced distortion The base of a transistor constitutes the input of an amplifier arrangement, to which an input signal may be applied. The emitter of this transistor is coupled to the negative power-supply terminal by means of a first resistor. The collector of this transi... | 12/09/1986 |
| 4590005 | Some macrocyclic compounds and their preparation The present invention relates to novel macrocyclic carbonyl compounds of the macrocyclic carbamate and lactone type, to chiral macrocyclic structures, to macrocyclic urea compounds and to macrocyclic thiolactones and to a process for the preparation of sa... | 05/20/1986 |
| 4540950 | Wideband linear amplifier A linear amplifier circuit includes input and output signal ports and a pair of signal amplifying circuits. Each signal amplifying circuit couples an input signal from the input signal port to the output signal port. A bias supply can be connected to the ... | 09/10/1985 |
| 4420725 | Wide-bandwidth low-distortion amplifier A low-noise wide-band bipolar transistor amplifier in which distortion caused by non-linear transistor operating characteristics is substantially eliminated. An input signal is coupled to the base of a first transistor connected in an emitter follower con... | 12/13/1983 |
| 4105943 | Integrated amplifier with negative feedback The dynamic input impedance of a feedback current amplifier is varied such that a matching to the characteristic impedance of a line feeding the amplifier is achieved. An integrated negative feedback current amplifier has at least two amplifier stages and... | 08/08/1978 |
| 4093925 | Method and system of driving power field effect transistor A method and a system of obtaining a large power with the use of a junction field effect transistor by extending the working range to improve the utilization rate of the power source voltage. The range for the gate voltage is set up to some predetermined ... | 06/06/1978 |
| 4058776 | Bias circuit for avalanche diodes A bias circuit for a large pulse-width, broad-bandwidth radio-frequency avalanche device comprising a power supply coupled to the device through a bias line. The bias circuit includes a resistive network shunted across the bias line and ground to dampen s... | 11/15/1977 |
| 4057763 | Current amplifiers Current mirror amplifiers, which exhibit greater current attenuation (or gain) than prior art current mirror amplifiers taking up the same area on a monolithic integrated circuit die, are described in which the base-emitter junctions of the mirroring tran... | 11/08/1977 |
| 4044313 | Protective network for an insulated-gate field-effect (IGFET) differential amplifier The input stage of an amplifier includes two input terminals to which are connected the gates of two, differentially connected, IGFETs protected by two diodes connected back-to-back (in series) between the gates. The amplifier also includes means for appl... | 08/23/1977 |
| 4015212 | Amplifier with FET having gate leakage current limitation An amplifier having at least a drive stage and an output stage, the output stage comprised of an FET for applying an amplified signal to a load. The drive stage includes a transistor device whose output is direct coupled to the gate electrode of the FET, ... | 03/29/1977 |
| 3993869 | Amplifying circuit for use with a high impedance source transducer An amplifying circuit for use with a transducer includes a pair of field-effect transistors which are of different conductive types from each other and each of which has gate, drain and source electrodes. The gate electrodes of the field-effect transistor... | 11/23/1976 |
| 3978419 | Temperature and supply voltage compensated amplifying device A voltage amplifying device that is compensated to reduce variations in its output voltage due to changes in temperature or supply voltage by means of two transistors connected together so that changes in the base-emitter voltage of one transistor are cou... | 08/31/1976 |
| 3968451 | Transistor amplifier A transistor amplifier comprised of a transistor supplied with a first operating voltage and a field effect transistor having triode-type dynamic characteristics and supplied with a second operating voltage. The gate electrode of the field effect transist... | 07/06/1976 |
| 3968382 | Protective circuit for field effect transistor amplifier A field effect transistor amplifier comprising one or more depletion-type field effect transistors, preferably with triode characteristics, and having an operating voltage applied across its drain and source electrodes through a load, while an input signa... | 07/06/1976 |
| 3965437 | Avalanche semiconductor amplifier A microwave semiconductor amplifier or oscillator system in which a semiconductor device has an avalanching region at a junction and a heat sink having a higher thermal conductivity than said avalanching region in close thermal contact with the said junct... | 06/22/1976 |
