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| Number | Title | Issue Date |
| 7852154 | High precision follower device with zero power, zero noise slew enhancement circuit A high performance follower device coupled with a slew enhancement circuit includes an amplifier circuit containing a follower device connected to a three-terminal device, whereupon current drawn through the three-terminal device is amplified through a current ampli... | 12/14/2010 |
| 7236741 | Methods and apparatus for tuning in an inductive system Electronic circuitry supports utilization of a series of pulses of varying width to tune a transducer (e.g., a coil that produces or receives a magnetic field) for transmitting or receiving. For example, a control voltage generator generates a sequence of digital pu... | 06/26/2007 |
| 7220953 | Photodiode circuit with improved response time A circuit has a voltage source, a node, a photodetector electrically coupled between the voltage source and the node, a resistor electrically coupled between the node and ground, and a voltage clamp electrically connected to the node, the voltage clamp configured to... | 05/22/2007 |
| 7035608 | Methods and apparatus for tuning in an inductive system Electronic circuitry supports utilization of a series of pulses of varying width to tune a transducer (e.g., a coil that produces or receives a magnetic field) for transmitting or receiving. For example, a control voltage generator generates a sequence of digital pu... | 04/25/2006 |
| 6879215 | Synthetic circuit component and amplifier applications Synthetic circuit elements and amplifier applications for synthetic circuit elements are provided. The synthetic circuit elements disclosed herein may be configured to compensate for some or all of the parasitic capacitance normally associated with circuit elements ... | 04/12/2005 |
| 5945877 | Power amplifier with bootstrap voltage clamp An amplifier output stage having an output transistor connected to a high supply voltage and a bootstrap terminal coupled to a control terminal of the output transistor through control circuitry. The output stage includes a capacitor arranged between the ... | 08/31/1999 |
| 5892398 | Amplifier having ultra-low distortion This invention is for an improvement in amplifiers resulting in ultra low distortion. It relates to amplifiers consisting of three stages, an input stage which amplifies an input signal and provides a first signal to an intermediate stage which amplifies ... | 04/06/1999 |
| 5861775 | Signal conditioning circuit for low amplitude, high common mode voltage input signals A cost-effective conditioning circuit for extracting a weak, floating, wide-band signal with a low common-mode voltage from noisy environments is proposed that includes a high gain single ended operational amplifier to increase the amplitude of the signal... | 01/19/1999 |
| 5638026 | High input impedance circuit and semiconductor integrated device provided therewith A high input impedance circuit includes an amplifier such as an operational amplifier comprising transistors of a first polarity which serve as a differential pair and input of the amplifier, base of one transistor being caused to serve as a positive inpu... | 06/10/1997 |
| 5592123 | Frequency stability bootstrapped current mirror A floating current mirror circuit is disclosed which achieves high open loop gain without additional voltage gain stages leading to frequency compensation and increased power dissipation. The output of the circuit has only a first pole and is designed to ... | 01/07/1997 |
| 5521555 | Ultra low noise optical receiver An amplifier topology for receiving signals output from a fiber optic rotation sensor and producing voltages that may be processed to determine the rotation rate includes a photodiode for receiving an optical signal and producing a corresponding electrica... | 05/28/1996 |
| 5416442 | Slew rate enhancement circuit for class A amplifier An improved Class A amplifier has an enhanced slew rate response at high frequencies. A positive feedback path is connected from the output of the amplifier to a point on the gain path. The feedback path includes a capacitor, a resistor and a transistor, ... | 05/16/1995 |
| 5392001 | Capacitively-coupled amplifier with improved low frequency response A capacitively-coupled amplifier circuit includes an amplifier for receiving an input signal via a coupling capacitance and for amplifying the input signal to produce an output signal. A resistor provides a bias voltage to the amplifier. The resistor is b... | 02/21/1995 |
| 5337011 | Pre-amplifier A tiny pre-amplifier for a small, low voltage, high impedance signal source, usually an electret microphone, exhibiting near unity gain, has an input cascode stage connected to the microphone and a matched balancing cascode stage; both cascode stages are ... | 08/09/1994 |
| 5315263 | Push-pull amplifier having bootstrap capacitor isolation An audio power amplifier includes a stacked pair of complementary transistors having the emitters commonly coupled to a load. A driver stage couples the bases of the stacked pair to a source of audio frequency signal. A bootstrap capacitor is coupled betw... | 05/24/1994 |
| 5192920 | High-sensitivity, low-noise transistor amplifier A high-gain, low-noise transistor amplifier comprises an input, an output, and first and second field effect transistors each having a gate, a drain, and a source and being formed in a common semiconductor substrate. The second transistor is a depletion m... | 03/09/1993 |
| 5140279 | Slew rate enhanced linear amplifier A high speed feedback amplifier is frequency compensated utilizing circuitry that does not cause distortion in the amplifier nor does it limit the slew rate of the amplifier. In one embodiment compensation circuitry drives one side of the compensation cap... | 08/18/1992 |
| 5111084 | Low loss drain pulser circuit for solid state microwave power amplifiers A drain pulsing circuit for intermittently applying electric power to the drain of a solid state amplifier uses a N-channel MOSFET as the drain switch, but does not require an external bias voltage to drive the drain switch gate. The pulsing circuit gener... | 05/05/1992 |
| 4791313 | Bipolar transistor switching enhancement circuit A line driver circuit capable of operating at high speeds. The output transistor, an emitter connected to an output terminal, has a special feedback capacitor connected to its base. The feedback capacitor helps pull the output terminal high to increase th... | 12/13/1988 |
| 4791383 | High speed current amplifier buffer circuit A high speed buffer circuit is composed of complementary symmetry emitter follower driver and output stages. The input of driver stage includes active load devices cross-coupled to the output stage inputs so that the output stage is bootstrap driven from ... | 12/13/1988 |
| 4786879 | Attenuator circuit employing bootstrapping When impedance elements such as FETs are used in attenuators, the elements have linear responses only when the signals attenuated are below certain signal levels. When signal conditions causing the element to operate non-linearly are detected, bootstrappi... | 11/22/1988 |
| 4764732 | Switchable mode amplifier for wide dynamic range There is disclosed an amplifier device for use with a photodetector for amplifying wave energy signals received by the photodetector and converted into electrical signals. The amplifier device includes a first amplifier having its input connected to a jun... | 08/16/1988 |
| 4752702 | Bootstrap pilot circuit in N-MOS technology for capacitive loads A bootstrap condenser connected to the output of the circuit is preloaded during the low output state when the load transistor is off and the drive transistor is normally on. A commutation signal brings about extinction of the drive transistor and connect... | 06/21/1988 |
| 4746877 | Direct-coupled wideband amplifier An improved gain stage includes a pair of differentially-connected, matched, bipolar transistors and local positive feedback from the output to the collector electrode of one input transistor to provide D.C. balance and substantially enhanced voltage gain... | 05/24/1988 |
| 4706035 | High efficiency amplifier having a bootstrap capacitor A high-efficiency class-G type amplifier comprises a first transistor (T1), having its collector connected to a first supply voltage (V1) via a first diode (D1) and a second transistor (T2), connected in series ... | 11/10/1987 |
| 4706039 | Amplifier arrangement A class-G amplifier comprises first, second and third terminals connected to a load, first supply voltage (V1) and second supply voltage (V2), respectively, where V2 >V1. First (T1) and second (T... | 11/10/1987 |
| 4688001 | High Efficiency, low distortion amplifier A high efficiency class-G amplifier comprises first (2), second (4) and third (10) terminals connected to a load, a first (V1) and second (V2) supply voltage, respectively, where voltage V2 >V1. First (T1 | 08/18/1987 |
| 4646002 | Circuit for high impedance broad band probe A zero capacitance measurement probe to be used to make electrical measurements at a broad range of frequencies without having the probe itself affect the measured values. The probe reduces internal capacitances in the solid state active elements or creat... | 02/24/1987 |
| 4622498 | Dynamic focus system cascode amplifier Dynamic focus system utilizing an improved cascode amplifier is provided wherein the amplifier provides substantial voltage gain for a composite horizontal and vertical parabola signal and the output of the cascode amplifier is provided to the focus contr... | 11/11/1986 |
| 4524331 | High input impedance amplifier circuit A three-stage amplifier circuit specially configured to provide a high input impedance. An initial emitter follower transistor stage amplifies the current level of an ac input signal to produce a first intermediate signal, a common-base transistor stage a... | 06/18/1985 |
| 4500849 | Low noise power amplifier circuit A low noise power amplifier in which a buffer including a field effect transistor coupled in a source follower configuration is interposed between a voltage amplifying stage and a power amplifying stage, the latter utilizing a single-ended push-pull emitt... | 02/19/1985 |
| 4499432 | Low voltage op amp bias optimizer An operational power amplifier having a bootstrap power output stage is designed to provide maximum dynamic range over a wide range of supply voltages. A control circuit in the form of a switched current mirror is added to the amplifier biasing circuit. A... | 02/12/1985 |
| 4492932 | Amplifier circuit having a high-impedance input and a low-impedance output An electronic circuit for a high impedance probe for an instrument for measuring electrical voltages, comprising an input field effect transistor 15 connected in a source-follower configuration, a bipolar transistor 17 connected in an emitter-follower con... | 01/08/1985 |
| 4484147 | Bootstrapped shunt feedback amplifier An improved bootstrapped shunt feedback amplifier is provided in which a minimum number of transistors are arranged to provide a higher slew rate of output voltage at lower power, while minimizing distortion and thus providing a more precise signal replic... | 11/20/1984 |
| 4412183 | AC Resistor attenuator and associated amplifier circuits An AC resistor attenuator with low parasitic capacitance coupling and, thus, a substantially constant attenuation value over a relatively wide frequency range is disclosed. The AC resistor attenuator comprises a first elongate resistor substantially entir... | 10/25/1983 |
| 4390852 | Buffer amplifier A buffer amplifier suitable for use as an input amplifier for an oscilloscope comprises a hybrid FET-bipolar transistor source follower input stage and a complementary emitter follower output stage. Both the input and output stages include bootstraps to e... | 06/28/1983 |
| 4371847 | Data transmission link A method and apparatus for altering the apparent electrical characteristic of a distributed electrical component in an integrated circuit is disclosed. In one form a distributed load resistor is sunk into a parallel distributed guard resistor. The mutual ... | 02/01/1983 |
| 4268796 | Linear amplifier with distortion correction An a-c linear amplifier with two push-pull-connected output transistors includes an ancillary transistor which, during saturation of one of the output transistors and the simultaneous cutoff of a controlled transistor driving these output transistors thro... | 05/19/1981 |
| 4206419 | Power amplifier A power amplifier comprises: a complementary symmetry push-pull circuit formed with two complementary transistors mutually coupled at their emitters and having an operating point for Class-A mode operation; a floating power supply having a neutral termina... | 06/03/1980 |
| 4125814 | High-power switching amplifier A switching amplifier includes a grounded collector NPN Darlington amplifier having a main current path connected between a terminal for receiving an operating voltage and an output terminal, and an input base and output emitter electrodes across which a ... | 11/14/1978 |
