Celebrity Inventors
Glam girl Heddy Lamar may have used her good looks to good effect on the silver screen, but she put her smarts to better use as an inventor. During World War II, she co-patented a frequency-switching system for torpedo guidance that was considered years ahead of its time.
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| Number | Title | Issue Date |
| 7965125 | Current drive circuit A current drive circuit allows for a reduction in chip size and prevents an output current from decreasing. The current drive circuit has an output terminal connected to a first resistor. The first resistor is connected to a second resistor and the drain of a first ... | 06/21/2011 |
| 7843248 | Analog switch with overcurrent detection A switch circuit including a first switch, a reference device, a current generating device and a comparator. The first switch has a first resistance and develops a first voltage when a first current is provided through it. The reference device has a second resistanc... | 11/30/2010 |
| 7619461 | Switching circuit which is used to obtain a doubled dynamic range It permits switching signals with a peak level equal to the source voltage by means of a transistor, the peak to peak level being double the source. It is characterized by the connection of a transistor (17) to the signal source (10) and a load ... | 11/17/2009 |
| 7362078 | Power supply circuit The present invention relates to a power supply circuit that can intermittently operate when its load is small and therefore can reduce current consumption at a sleep mode. The power supply circuit for receiving an input voltage at an input terminal, converting the ... | 04/22/2008 |
| 7352786 | Apparatus for driving light emitting element and system for driving light emitting element In case of driving each of light emitting parts of a surface emitting laser, each of light emitting parts is made to be in forward-bias state and switches appropriately change bias voltage, which is lower than laser oscillation threshold voltage, and drive voltages,... | 04/01/2008 |
| 7274177 | Overshoot suppression circuit for a voltage regulation module An overshoot suppression circuit comprises a switch for coupling to an output of a voltage regulation module and a voltage detector for detecting an output voltage at the output. When the load to the voltage regulation module changes from heavy to light to result in... | 09/25/2007 |
| 7268528 | Constant-current circuit and system power source using this constant-current circuit A constant-current circuit and a system power source using this constant-current circuit are disclosed, which can generate plural highly accurate constant currents and supply them as bias currents by reducing variations caused by a change of a manufacturing process ... | 09/11/2007 |
| 7245887 | High speed CMOS transmit-receive antenna switch A high-speed CMOS transmit/receive antenna switch includes a first transistor, a second transistor and a parasitic compensation network. The first transistor is operably coupled to an antenna, to a transmit path, and to receive a transmit/receive (T/R) control signa... | 07/17/2007 |
| 7215180 | Constant voltage circuit A constant voltage circuit is disclosed that includes an output control transistor and an overcurrent protection circuit. The overcurrent protection circuit includes a proportional current generation circuit part, a current division circuit part, a division ratio co... | 05/08/2007 |
| 7212063 | Half-bridge circuit with phase output A half-bridge circuit, in which an input signal that is applied between two input terminals can be picked up at a phase output comprises two switching transistors controlled by a respective control signal that is applied between a control electrode and an auxiliary ... | 05/01/2007 |
| 7120399 | High speed CMOS transmit-receive antenna switch A high-speed CMOS transmit/receive antenna switch includes a first transistor, a second transistor and a parasitic compensation network. The first transistor is operably coupled to an antenna, to a transmit path, and to receive a transmit/receive (T/R) control signa... | 10/10/2006 |
| 7102414 | Muting circuit for audio amplifier A muting circuit for an audio amplifier comprises differential pairs of MOS transistors in a differential amplifier and two sets of MOS transistor switch to control the differential pairs respectively. The differential pairs are connected with a current mirror circu... | 09/05/2006 |
| 7049879 | Power supply circuit with control of rise characteristics of output voltage In a power supply circuit, a main transistor, which transmits power from an input terminal to an output terminal, is controlled so that a detected voltage from an input voltage is consistent with a reference voltage indicating a target voltage. An output current is ... | 05/23/2006 |
| 6960954 | Variable frequency electric signal generator, automatic control and low cost computing means The invention concerns a signal generator comprising a reference signal generator consisting of a microcontroller, a chopping switch, a sensor for sampling, and a comparator for delivering a value based on the difference between a sample signal and a reference signa... | 11/01/2005 |
| 6853235 | High frequency switch, amplifying circuit, and mobile communication terminal In order to provide a high frequency switch in which the setting range of the control voltage is expanded, the high frequency switch is constructed from a switch and a reference voltage generation circuit. The switch comprises first and second field effect transisto... | 02/08/2005 |
| 6842064 | Overcurrent protection and masking circuitry for protection against an overcurrent condition An overcurrent protection circuit (6) outputs an overcurrent protection signal (S6) based on a sense voltage (Vsense). A masking circuit (5) is configured so as to allow a masking signal (S5) to be kept set to “L” even when... | 01/11/2005 |
| 6700432 | Two-terminal switch circuit and voltage threshold responsive circuit component A two-terminal switch circuit (1) for periodically energizing a load (20) from a voltage supply includes a controllable switch (4) connected between the switch terminals (2,3), a resistance (8) and a capacitor (9) connected in series between the terminals... | 03/02/2004 |
| 6603341 | Load drive circuit having low voltage detector A charge pump circuit receives a battery voltage of a power line, and outputs a raising voltage proportional to the battery voltage. A low voltage detecting circuit detects a low voltage state in which a detecting voltage obtained by dividing the raising ... | 08/05/2003 |
| 6552599 | Diode circuit with ideal diode characteristic A circuit configuration produces an at least approximately ideal diode characteristic on the basis of a diode. A power MOSFET has a control path connected in parallel with the diode, a load path forming connection terminals of the ideal diode, and a gate ... | 04/22/2003 |
| 6426667 | Bidirectional analog switch using two bipolar junction transistors which are both reverse connected or operating in the reverse or inverse mode The present invention relates to an integrated circuit bidirectional switch formed from bipolar transistor devices, in which the saturation voltage is sought to be reduced. More specifically, an integrated NPN bipolar transistor is formed with oxide insul... | 07/30/2002 |
| 6411153 | Universal pulse width modulated zero voltage transition switching cell A universal zero voltage transition switching cell using a small choke, a pair of switches, and a capacitor is revealed. The application of the universal zero voltage transition switching cell to any of a wide variety of hard switching pulse width modulat... | 06/25/2002 |
| 6218888 | Insulated gate bipolar transistor device with a current limiting circuit An insulated gate bipolar transistor (IGBT) device is a semiconductor device comprising a main IGBT 1, a sub IGBT 20, and a current limiting circuit 30 on one chip. It has an n-channel main IGBT 1, sub IGBT 20, and sensor IGBT 2 connected in parallel, who... | 04/17/2001 |
| 6154086 | Low ripple power distribution system An apparatus having a power supply terminal, a capacitor terminal, and a load terminal for distributing power from the power supply terminal to the capacitor terminal. The apparatus has a driver which supplies load current to the load terminal in response... | 11/28/2000 |
| 6127746 | Method of controlling the switching DI/DT and DV/DT of a MOS-gated power transistor The switching di/dt and switching dv/dt of a MOS gate controlled ("MOS-gated") power device are controlled by respectively controlling the voltage and current waveforms. Open loop control of the turn-on of the MOS-gated device is provided by coupling a co... | 10/03/2000 |
| 5905390 | Inductive load drive circuit An inductive load drive circuit includes a transistor for pulling-in an excitation current having a predetermined polarity and generated by an inductive load. The transistor is turned-on by a first idling loop when a drive voltage of the inductive load ha... | 05/18/1999 |
| 5892387 | Analog switching circuit device and semiconductor integrated circuit device In a situation where another analog switching circuit 502 outputs a high potential Vh, this high potential Vh is applied to an output terminal OUT1 of an analog switching circuit 504. When a ground potential is supplied to a node 10 with a changeover swit... | 04/06/1999 |
| 5616970 | Method and circuit arrangement for driving semiconductor switches in a series circuit In a method and a circuit arrangement for driving semiconductor switches in a series circuit, in which a voltage limiting device is assigned to each semiconductor switch, the power losses of the voltage limiting devices are detected by a control equipment... | 04/01/1997 |
| 5561393 | Control device of semiconductor power device A control device for controlling a double gate semiconductor device having a second gate electrode for controlling transition from a thyristor operation to a transistor operation, and a first gate electrode for controlling transition from transistor opera... | 10/01/1996 |
| 5514893 | Semiconductor device for protecting an internal circuit from electrostatic damage A semiconductor device includes an input/output terminal, an internal circuit connected to the input/output terminal, a first terminal for providing a first electrical potential, and a second terminal for providing a second electrical potential which is l... | 05/07/1996 |
| 5461265 | High-frequency variable impedance circuit having improved linearity of operating characteristics A variable impedance element suitable for controlling a high-frequency signal is formed of a pair of FETs of identical conduction type, and functions to prevent variations in degree of channel opening of the FETs in response to positive and negative-going... | 10/24/1995 |
| 5373199 | MOS transistor output circuit A transistor (2P) permitted to select whether to operate as a common-source circuit or as a source follower type circuit is connected in series with a transistor (1P) operating as a common-source circuit. This selection is achieved by the control of a swi... | 12/13/1994 |
| 5117123 | Diode switch providing temperature compensated D.C. bias for cascaded amplifier A diode is connected at a first electrode thereof to a source of input signal to be switched via a capacitor and is connected at a second electrode thereof via an output circuit to an output terminal. A bias control circuit, coupled to the diode, provides... | 05/26/1992 |
| 5099138 | Switching device driving circuit Upper and lower arm monitoring circuits (13U, 13L) monitor on/off states of upper and lower arm switching devices (2U, 2L). The on/off command signal generating part (7) generates command signals for directing on/off of the switching devices (2U, 2L). Upp... | 03/24/1992 |
| 4866313 | Cascode BiMOS driving circuit using IGBT A cascode BiMOS driving circuit according to the present invention has an IBGBT (9) connected between a first output terminal (3) and the base of a bipolar transistor (Q1). An IGBT generally has a low on-state resistance, and hence a chip area for the IGB... | 09/12/1989 |
| 4746820 | Pulse frequency responsive switch A pulse frequency responsive switch includes a monoflop for receiving a pulse sequence. In response thereto, the monoflop generates a resulting square wave signal for application to an integration circuit and then a comparator. When the pulse rate of the ... | 05/24/1988 |
| 4575740 | Transistor circuit for reducing current after ignition in a metal paper printer To obtain a good print quality in metal paper printers, the print current, after ignition of the arc, must be rapidly reduced to a fraction of the value necessary for ignition. For this purpose, two transistor power stages (T3, T4) are connected to the pr... | 03/11/1986 |
| 4308994 | Energy saving circulating system for vehicle heaters An improved low power drain circulating system for vehicle heaters utilizing a magnetic motor power assembly for selectively circulating hot water from the vehicle's engine to the vehicle's heater, even when the engine is shut off, and having self-contain... | 01/05/1982 |
| 4306191 | Initializing circuit for long-time constant electronic devices An electronic circuit is described for accurately and rapidly initializing long-time constant amplifiers and the like. More specifically, the circuit is designed to establish quiescent conditions in minimal time and with minimal settling in amplifiers or ... | 12/15/1981 |
| 4180747 | Switching circuit for eliminating the effects of contact bounce A switching circuit is disclosed for eliminating the effects of contact bounce in a movable contact switch connected between a voltage source and the input of a switching transistor. When the movable contact switch is closed, bouncing of the contacts unde... | 12/25/1979 |
| 4087703 | Semiconductor switch device A semiconductor switch device comprising: a main power source for supplying main current; a load connected to one side of said main power source; a semiconductor switch having first and second main current electrodes and a control electrode, the first mai... | 05/02/1978 |
