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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 5892381 | Fast start-up circuit The rise time of a voltage Vo presented to a load, based on an input voltage Vi provided via an RC filter coupled to the load for removing higher frequency noise on Vo, is substantially reduced by providing a sensor circuit with differential inputs Vi, Vo... | 04/06/1999 |
| 5862045 | Switched mode power supply controller and method A switched mode power supply has a transformer and a power switch to switch a primary current for operation in a critical conduction mode. The switched mode power supply has a controller which switches off a primary current when a peak current is reached.... | 01/19/1999 |
| 5845098 | Address lines load reduction Subsystems (12-20) are coupled by a bus (44) which includes higher order address lines (62, 64) and lower order address lines (60). One or more subsystems (20) has an address connection (202) for receiving lower order addresses (76') identifying an addres... | 12/01/1998 |
| 5834926 | Bandgap reference circuit In a bandgap reference circuit (200), a base-emitter voltage VBE with a first temperature coefficient TC1 is added to a voltage difference ƊV with a second, opposite temperature coefficient TC2 by two resistors (210,220).... | 11/10/1998 |
| 5790063 | Analog-to-digital converter on CMOS with MOS capacitor An analog-to-digital converter is introduced which operates as an oversampled delta-sigma converter. The converter is implemented fully differentially, having doubled integrator capacitors (130, 230), comparators (180, 280), and feedback units (160, 260).... | 08/04/1998 |
| 5783954 | Linear voltage-to-current converter A linear voltage-to-current converter (VIC) 100 for converting a differential input voltage VD into a differential output current ID is provided. The VIC (100) comprises a main stage (20) and a correction stage (30) having two FET each. Every s... | 07/21/1998 |
| 5777516 | High frequency amplifier in CMOS A high frequency monolithic amplifier (100) is provided which can be used, for example, in the PLL prescaler of cellular radio systems. The amplifier (100) amplifies single-ended signals having a frequency in the GHz area. It includes a feedback unit (160... | 07/07/1998 |
| 5760648 | Electronic circuit for converting a differential signal into a single-ended signal with common mode voltage rejection by resistor network A differential-to-single-ended converter comprising a resistor network (205) and an operational amplifier is introduced. In comparison to prior art converters, a resistor (250) placed between the non-inverting input (264) of the operational amplifier (260... | 06/02/1998 |
| 5760726 | Digital-to-analog converter with dynamic matching and bit splitting A digital-to-analog (D/A) converter (400) receives a N bit digital signal SN by a signal divider (440) which divides it into digital group signals SNk. In converter blocks (401k), these digital group signals SNk... | 06/02/1998 |
| 5751178 | Apparatus and method for shifting signal levels The electronic circuit (100) of the invention receives first signals DATA (170) having logical "1" at high (VCCH) or low (VCCL) levels and logical "0" at reference level (ZERO) and generates second signals OUT (186) between high level (VCCH) and reference... | 05/12/1998 |
| 5748071 | High speed comparator with programmable reference A system rapidly dynamic values (B) on a bus (12) to a programmable but thereafter fixed reference value (C). The system includes first leads (33) coupled to a comparison means (35), second leads (13) coupled to the bus (12) and third leads (34, 36) coupl... | 05/05/1998 |
| 5748030 | Bias generator providing process and temperature invariant MOSFET transconductance The present invention describes a bias generator (10) which supplies a temperature stabilizing bias current (72) to a main circuit (90). The bias generator (10) comprises a measurement unit (20) having a similar structure and temperature characteristic as... | 05/05/1998 |
| 5414738 | Maximum likelihood paths comparison decoder There is described an apparatus and method for decoding signals produced by a communication system employing cascading or concatenation of error control codes that contain, for example, short memory convolution codes. A novel inner decoder and method is d... | 05/09/1995 |
| 5410743 | Active image separation mixer A mixer separates IF components IF1, IF2 of the same frequency which are images of different frequency RF signals RF1, RF2 beating with a given LO signal. The LO signal is applied to a FET active power divider and applied to the drains of a pair of balanc... | 04/25/1995 |
| 5401689 | Method for forming a semiconductor chip carrier A carrier allows a semiconductor die to be flip-chip mounted to a printed wiring board. Many carriers are formed together in an array. A bottom pad constellation formed on one side of a carrier is compatible with the printed wiring board's layout rules. T... | 03/28/1995 |
| 5387547 | Process for adjusting the impedance of a microwave conductor using an air bridge A method for providing local matching elements for adjusting the characteristic impedance of local transmission line segments to more closely match the input or output impedance of the particular devices to which they couple. The method includes the step ... | 02/07/1995 |
| 5342999 | Apparatus for adapting semiconductor die pads and method therefor A carrier allows a semiconductor die to be flip-chip mounted to a printed wiring board. Many carriers are formed together in an array. A bottom pad constellation formed on one side of a carrier is compatible with the printed wiring board's layout rules. T... | 08/30/1994 |
| 5293576 | Command authentication process A slave station, such as an orbiting satellite, and a master station, such as a ground control station, have their own lists of random pads. The master and slave station lists are identical. When the master station sends a critical command to the slave st... | 03/08/1994 |
| 5268694 | Communication system employing spectrum reuse on a spherical surface Orbiting satellites project footprints on the earth. Each footprint is divided into cells. Footprints of nearby satellites overlap one another, and the overlap increases as satellites approach a pole from the equator. The positions of all cells generated ... | 12/07/1993 |
| 5265190 | CELP vocoder with efficient adaptive codebook search A new method for Code Excited Linear Predictive (CELP) coding of speech reduces the computational complexity by removing a convolution operation from a recursive loop used to poll the adaptive code book vectors. In a preferred embodiment, an impulse funct... | 11/23/1993 |
| 5260644 | Self-adjusting shunt regulator and method A shunt regulator for isolating a power supply and load is described which automatically adjusts the quiescent current though the shunt, and therefore its available dynamic range, in proportion to the load current fluctuations. A signal proportional to th... | 11/09/1993 |
| 5249230 | Authentication system An environment which includes a communications network, user terminals, and an authentication center provides communication services only to legitimate subscribers. The center receives an equipment ID for each terminal and uses a secret key to encrypt the... | 09/28/1993 |
| 5227802 | Satellite system cell management There is provided a method and means for controlling the amount of overlap and gaps in coverage of antenna pattern cells of a moving satellite communication system, by determining the relative spatial location of overlapping or gaping cells of converging ... | 07/13/1993 |
| 5214796 | Image separation mixer A mixer (50) separates IF components IF1, IF2 of the same frequency which are images of different frequency RF signals RF1, RF2 beating with a given LO signal, by combining a 180° phase shift input (56) for the LO signal (53) and a 90° phase shift input... | 05/25/1993 |
| 5194833 | Airbridge compensated microwave conductors The performance of microwave coplanar and other circuit boards is improved by providing local matching elements for adjusting the characteristic impedance of local transmission line segments to better match the input or output impedance of the particular ... | 03/16/1993 |
| 5192875 | Analog frequency divider utilizing two amplifiers and a LC resonant circuit An microwave analog frequency divider capable of ten percent bandwidth at 10 GHz has push-push amplifiers forming an injection locked oscillator. The input frequency fi is injected at the amplifier reference terminals. The amplifier control ter... | 03/09/1993 |
| 5190462 | Multilead microwave connector An N×M electrical connector suitable for use at microwave frequencies comprises a first set of N insulating parallel substrates each containing M notches with adjacent planar conductors and a second set of M parallel substrates having up to N spaced-apar... | 03/02/1993 |
| 5187745 | Efficient codebook search for CELP vocoders A new way of determining correlation coefficients for stochastic codebook vectors for CELP coding of speech takes advantage of the sparsely populated nature of stochastic codebook vectors. N valued input signals (e.g., convolution vectors) to be correlate... | 02/16/1993 |
| 5179594 | Efficient calculation of autocorrelation coefficients for CELP vocoder adaptive codebook A new way of determining autocorrelation coefficients for adaptive codebook vectors for CELP coding of speech simplifies and improves the accuracy of the autocorrelation coefficient determination for the situation where the codebook vector length being an... | 01/12/1993 |
| 5177381 | Distributed logarithmic amplifier and method A logarithmic amplifier includes amplifier stages having an input transmission line and first and second output transmission lines. The input and output transmission line are coupled by multiple amplifier elements distributed along the transmission lines.... | 01/05/1993 |
| 5173941 | Reduced codebook search arrangement for CELP vocoders A new way of CELP coding speech simplifies the recursive loop used to poll code adaptive book vectors by reducing the number of autocorrelation operations that must be performed with the K vectors of the codebook each having N entries. Autocorrelation is ... | 12/22/1992 |
| 5111155 | Distortion compensation means and method Distortion introduced in phase modulated RF signals by amplifiers and other signal processors is substantially reduced by modifying complex modulating signals I,Q in a way that compensates for the amplifier phase error $c;e as a function of ... | 05/05/1992 |
| 5007702 | Fiber optic cable retainer A fiber optic cable connection having easy cable insertion and greater pull strength is obtained by providing a cable connector (30) embodying a tapered, partially split sheath (38) around the cable (18) in a tapered hole (36) in the connector body (32) a... | 04/16/1991 |
| 5006737 | Transformerless semiconductor AC switch having internal biasing means An improved semiconductor AC switch is described having internal bias generation for the power MOSFET switches and isolated control input. Dual power MOSFETS with substrate diodes are connected in series between source and load. DC gate bias for the MOSFE... | 04/09/1991 |
| 5005069 | Rectifier and method A rectifier (60) is formedf by soldering a diode chip (66) in a cavity (64) in a metal base (62) having a metal sidewall (69), soldering the head (72) of an axial lead (70) to the chip (66), and filling the cavity (64) with an encapsulation (88). An outwa... | 04/02/1991 |
| 5001075 | Fabrication of dielectrically isolated semiconductor device Improved dielectrically isolated semiconductor structures especially suited for very high frequency bipolar transistors are produced. Recesses are formed in a (e.g., N+) single crystal semiconductor wafer, the wafer surface is coated with a die... | 03/19/1991 |
| 5001545 | Formed top contact for non-flat semiconductor devices An improved contact is obtained to power devices having a raised dielectric region adjacent the die contact region by providing a contact dimple on the otherwise flat metal lead used for die contact. The dimple is arranged above the die contact and solder... | 03/19/1991 |
| 4993559 | Wafer carrier An improved carrier for holding semiconductor wafers at a predetermined angle during processing is described having side rails with slots for holding lateral edges of the wafer and bottom slots having a curved floor for supporting the wafer edge without s... | 02/19/1991 |
| 4994412 | Self-centering electrode for power devices An improved means and method for forming leads to a power device is provided by use of a one-piece leadframe on which the die is mounted and a separate connecting clip between the leadframe and the bonding pad on the semiconductor die. The leadframe has a... | 02/19/1991 |
| 4991002 | Modular power device assembly Very compact, low cost power semiconductor device modules suitable for use in variable speed motor controllers multiple solenoid drivers, and the like are provided by attaching pre-packaged (e.g., type TO-220) semiconductor devices by their heat dissipati... | 02/05/1991 |
