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6369644 |
Filter circuit
A filter circuit extracts a desired signal in the presence of interference by using a variable gain circuit whose input is the frequency converted received signal and whose output is fed through an...
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6362666 |
Precision and fast recovery buffer
An embodiment of the invention is directed to a buffer circuit having a closed loop negative feedback amplifier that is coupled to continuously drive a node to a predetermined set voltage. A...
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6349121 |
Baseband data slicing method and apparatus
A DC-coupled data slicer operates on a baseband signal based on a variable threshold and an AC-coupled data slicer operates on the baseband signal based on a fixed threshold. The variable threshold...
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6340911 |
Level conversion circuit having differential circuit employing MOSFET
Disclosed herein is a level conversion circuit which operates at high speeds even at a low power-supply voltage. The level conversion circuit is largely constituted by an emitter follower section ...
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6316983 |
Predistortion circuit
An input signal is phase-inverted to supply the inverted signal to a gate of an FET. When the gate-source voltage Vgs decreases, the differential resistance Rds of the FET increases. Moreover, the...
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6300817 |
Temperature stabilization of a predistorter
A circuit to reduce the temperature-dependence of a predistorter diode in a predistorter for an external optical modulator characterized in that a predistorter diode (D1, D2) is connected in series...
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6275087 |
Adaptive cancellation of time variant DC offset
A DC drift canceller circuit is disclosed. The circuit includes a decision device including an input and an output and a first adder configured to received the input and the output of the decision...
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6246279 |
Output amplitude control circuit
The invention presents a circuit by which control of the output amplitude of digital analog converters can be carried out at high speed and with high precision. A first digital signal that is the...
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6232768 |
Centering a signal within the dynamic range of a peak detecting proximity detector
A magnetic-field-to-voltage transducer includes a Hall element and a digitally gain-controlled Hall-voltage amplifier that produces an analog voltage Vsig having excursions of one polarity...
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6172543 |
90° phase shift circuit
A 90° phase shift circuit receives an input signal to generate a Q-signal and an I-signal having a phase difference of 90° therebetween. The 90° phase shift circuit has a CR-type high-pass...
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6127875 |
Complimentary double pumping voltage boost converter
A voltage boosting circuit which derives an output voltage than is substantially twice the magnitude of a supply voltage applied thereto. The voltage boosting circuit consists of complementary...
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6081150 |
Voltage control type control apparatus capable of achieving correct control characteristic without increasing interface line number
In a control voltage producing apparatus, either a pulse-duration modulation signal or a pulse-width modulation signal, which are generated in response to a digital control signal, is from a first...
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6060933 |
Electronic vernier systems and methods
An electronic vernier realizes programmable gain steps with first and second impedance ladders, a plurality of activatable coupling networks and a switch network. The ladders receive and...
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5959496 |
Microprocessors with emission control
A microprocessor (9) has output driver circuitry (20 FIG. 1; 30, 32 FIG. 2) which is selectable by signals on electrical lines (22 FIG. 1; 36 FIG. 2) to obtain different drive levels. In this...
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5942930 |
Shaping and level adjusting filter
An electrical circuit is disclosed that is capable of adjusting the peak-to-peak voltage of a binary signal symmetrically around a reference voltage, without human intervention and without...
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5939920 |
Method and apparatus which adds distortion to a signal to compensate for distortion added at a later stage by a nonlinear element
An apparatus and method for providing distortion to an input signal. A first alternating current component is separated from the input signal, to provide a first signal representing the first...
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5933040 |
Method and apparatus for a data detection circuit operating from a low voltage power source
A method and apparatus for detecting pulse data is accomplished by a low voltage data detection circuit that includes a preamplifier circuit, an amplification stage, and a scaling circuit. The...
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5933041 |
Output driver with constant source impedance
An improved output driver that minimizes source point reflections when driving a signal on a transmission line by generating a constant source impedance. The improved output driver uses a...
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5923164 |
Apparatus and method for automatically tuning the gain of an amplifier
An apparatus and method for automatically and periodically tuning a signal having a gain element, a variable impedance associated with the gain element, and a control device. The gain element has...
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5920223 |
Method and apparatus to improve immunity to common-mode noise
The present invention provides a method and apparatus for improving immunity to common mode noise. The present invention prevents common mode noise from exceeding acceptable limits. The present...
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5907251 |
Low voltage swing capacitive bus driver device
A method and device for driving signals over a capacitive bus is provided. The device comprises at least one input line selectively activatable for receiving an input signal having a first voltage...
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5900745 |
Semiconductor device including input buffer circuit capable of amplifying input signal with low amplitude in high speed and under low current consumption
A semiconductor device is arranged by a push-pull circuit 1 for shifting a first center potential of an amplitude of an input signal to a second center potential, and for outputting first and...
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5872475 |
Variable attenuator
A variable attenuator is provided with a plurality of amplifiers each comprising an emitter grounded or common source amplifier circuit. The amplifiers have different emitter degeneration...
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5859556 |
Variable gain semiconductor circuit
Disclosed is a variable gain semiconductor circuit enjoying a low insertion loss, good distortion characteristic, and large variable gain range. The variable gain semiconductor circuit comprises: a...
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5841703 |
Method and apparatus for removal of VT drop in the output diode of charge pumps
A charge pump having an output diode with a zero voltage drop. The present charge pump may be a multiple stage charge pump that may operate more efficiently than prior charge pumps by substantially...
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5838184 |
Equivalent variable resistor circuits
An equivalent variable resistor circuit for use in an integrated circuit includes a signal path extending from a signal input terminal through a first resistor to a signal output terminal, a first...
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5834962 |
Level shift circuit and voltage controlled oscillation circuit using the same
A level shift circuit includes a plurality of diodes connected in tandem in a forward direction, a normally-ON transistor connected between a high-potential power line and a node of a highest...
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5796285 |
Voltage-limiting circuit with hysteresis comparator
In a voltage-limiting circuit, the voltage to be limited is applied to the terminals of a resistive line, and the current flowing in this line is amplified by a current mirror that thus produces a...
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5783963 |
ASIC with selectable output drivers
An ASIC (5) has four driver circuits (19a-19d), each with different output power. One of those driver circuits is selected from the content of register (13) on the ASIC. The register content being...
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5770961 |
Universal acoustic power amplifier
Disclosed are method and apparatus for producing electric waveform driver signals for exciting acoustic emitters such as foghorns, wherein the frequency and amplitude of the signals are readily...
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5767664 |
Bandgap voltage reference based temperature compensation circuit
A voltage-to-current converter for use with a bandgap voltage reference circuit for providing a correction current to compensate for the adverse effects of temperature. In one specific embodiment,...
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5767722 |
Delta sigma switch capacitor filter using curent feed forward
An electronic circuit having a circuit stage, such as a switched capacitor stage or a 1-bit digital-to-analog converter and switched capacitor filter, that is loaded with a load impedance employs...
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5760638 |
Phase generator circuit for charge pump type or negative supply circuit
A phase generator circuit cyclically produces a first pair of phase signals and a second pair of phase signals, comprising a first circuit to produce a first phase of each pair of phase signals,...
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5760497 |
Charge pump circuit with multiple boost stages
A charge pump circuit includes a plurality of voltage boost stages that are mutually parallel-connected between a supply line and an output line. Each of the stages includes first and second charge...
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5757220 |
Digitally controlled programmable attenuator
A digitally controlled programmable attenuator maintains tight phase matching between attenuated signals over wide ranges of frequencies and power levels regardless of the selected attenuation...
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5748026 |
Circuit for converting level of low-amplitude input
A level converting circuit for an input clock signal having a relatively low amplitude comprising a level converting circuit for converting the input clock signal to an output clock signal having a...
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5748027 |
Low power, high linearity log-linear control method and apparatus
Low power, high linearity log-linear control method and apparatus wherein a master log-linear cell generates a control voltage that is buffered and applied to a slave log-linear cell. By breaking...
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5708389 |
Integrated circuit employing quantized feedback
An integrated circuit employing quantized feedback is capable of compensating for decay in capacitively-coupled digital signals. In an exemplary embodiment, the integrated circuit includes a...
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5708537 |
Intelligent envelope detector and method for gain control for PRML data and servo channels including polarity detection
A method and apparatus are provided for gain adjustment of a signal. A plurality of comparators compare the signal with a plurality of threshold values. An envelope detector coupled to the...
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5705946 |
Low power low voltage level shifter
A low power, low voltage level shifter is provided. The voltage level shifter includes a first switching circuit, and a second switching circuit. The first switching circuit has a first input...
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5682115 |
Active pull-up voltage spike reducer
An embodiment of the present invention provides a method to reduce a regulated power source voltage spike during operation of a dynamic random access memory by the steps of: providing a voltage...
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5675279 |
Voltage stepup circuit for integrated semiconductor circuits
A voltage stepup circuit having a plurality of setup circuit units connected in stages between an input voltage node and a stepup voltage node. Each circuit unit comprises at least two first and...
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5650671 |
Charge pump circuit
A charge pump circuit including a number of pull-up stages connected in parallel with one another between a reference potential line and an output line. Each stage includes a capacitor having a...
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5650736 |
Slew rate controller for high speed bus
A technique for high speed transmission of digital signals on a bus line with reduced signal ringing, bounce and bus contention current. The approach uses a multi-partitioned driver design with...
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5646570 |
Apparatus for biasing a field effect transistor with a single voltage supply
Embodiments of the present invention bias a field effect transistor with only a single voltage source and generally do not have the disadvantages of traditional "floated source" bias techniques....
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5646549 |
Semiconductor device having an output circuit for transmitting low-voltage differential signals
A semiconductor device having an output circuit includes a first field-effect transistor having a source connected to a line from which a first voltage is inputted, and a second field-effect...
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5640111 |
Pulse voltage doubler circuit
A pulse voltage doubler circuit for doubling the voltage of output pulses from a microcomputer or the like operating on a low voltage, the doubled output being used on drive a load connected to the...
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5600186 |
Capacitor voltage divider circuit
A capacitor type voltage divider circuit is disclosed. The divider has a plurality of reference voltage signals applied from an external source. A plurality of switching sections are provided for...
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5592115 |
Voltage booster circuit of the charge-pump type with a bootstrapped oscillator
The invention relates to charge-pump circuits used for the generation, in an integrated circuit, of an internal supply voltage Vpp which is considerably greater than the external supply voltage...
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5587681 |
DC restoration circuit
In a D.C. restoration circuit for a digital FM radio receiver, in which demodulated signals may be presented at the output of the demodulator as low-level differential signals superimposed on a...
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