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7616044 |
Logarithmic temperature compensation for detectors
The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T 0 . The first H factor is...
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7557636 |
Geometric ladder circuit with linear-in-dB transfer function
A geometric ladder circuit produces a transfer function having substantially uniform steps measured in dB. Where the ladder has a plurality of substantially identical resistor rungs of a first...
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7375576 |
Log circuit and highly linear differential-amplifier circuit
A log circuit receives an operated current signal and a reference current signal at respective inputs and comprises an operand log circuit including a first bipolar semiconductor device and being...
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7340227 |
Wireless communication system and semiconductor integrated circuit
A wireless communication system uses a transmission power detection circuit. The transmission power detection circuit has excellent linearity of detection output for transmission output power and...
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7268609 |
Logarithmic detector or logarithmic amplifier having chopper stabilized logarithmic intercept
One embodiment of the present invention is directed to an apparatus for reducing errors affecting the intercept of a logarithmic device, the apparatus including a first switching device coupled to...
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7196569 |
Feedback compensation for logarithmic amplifiers
A logarithmic amplifier is compensated by a feedback loop. The feedback loop may control a series of detector cells in response to an output from one or more of the detector cells. The feedback...
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7180359 |
Logarithmic temperature compensation for detectors
The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T 0 . The first H factor is...
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7010283 |
Signal waveform detection circuit
A signal waveform detection circuit includes an amplifier circuit and a comparing circuit. The amplifier circuit has differential amplifiers connected in series. Each of the differential amplifiers...
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7002395 |
Demodulating logarithmic amplifier
A demodulating logarithmic amplifier rectifies a radio frequency signal prior to amplification through progressive stages. A full wave linear or squaring rectifier receives a waveform signal at the...
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6980044 |
Power element protection circuit and semiconductor device incorporating it
Connected to a power element having a first electrode, a second electrode, and a control electrode, a power element protection circuit detects a voltage between the first and second electrodes of...
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6911859 |
Method and apparatus for conversionless direct detection
A conversionless direct detection system for detecting signals having a very large dynamic range, with a virtually unlimited bandwidth utilizes a successive detection approach having successive log...
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6897700 |
Amplifier with digital DC offset cancellation feature
A high speed, high sensitivity post amplifier as described herein includes a digitally-controlled DC offset cancellation feature. The amplifier circuit is configured to provide DC offset voltage...
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6842062 |
Integrated electronic circuit including non-linear inductor devices
An integrated electronic circuit includes a plurality of active circuits connected together in cascade. A feedback loop is between an output of a last active circuit and an input of a first active...
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6759892 |
Temperature compensation trim method
The present invention overcomes the disadvantages of the prior art and provides a new temperature compensation trimming technique. Temperature compensated output is provided in a logarithmic...
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6753725 |
Low pass filter
A voltage controlled low pass filter comprising first and second circuits connected in series between a filter input and a filter output and a third circuit for adding a DC bias voltage to the...
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6734712 |
Logarithmic amplifier
A parallel-summation logarithmic amplifier is described that uses a novel topology of cascaded and parallel amplifiers to achieve extremely high bandwidth. Included in the topology is a unique...
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6720817 |
All NPN class-AB log-domain integrator with supporting input and output circuitry for low-voltage and high-frequency continuous-time filtering
Two variations of a continuous-time instantaneous companding filter are integrated in a 25 GHz bipolar process. Their −3 dB frequencies are tunable in the ranges of 1-30 MHz and 30-100 MHz. The...
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6680468 |
Electrical-supply-free MOS integrated circuit
An electrical-supply-free MOS integrated circuit is described. The circuit comprises: a first semiconductor device having a first current terminal, a first input voltage terminal, and a first...
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6636099 |
Logarithmic amplifier with temperature compensated detection scheme
A voltage mode logarithmic amplifier comprising: a first gain stage for providing an amplified rectified voltage signal responsive to an input voltage signal; a second gain stage for providing a...
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6633247 |
Logarithmic a/d converter, method of logarithmic a/d conversion logarithmic d/a converter, method of logarithmic d/a conversion, and system for measuring physical quantity
An analog multiplier 11 raises a base reference voltage “Vref 0 ” to the nth power so that a reference voltage “Vref 1 ” is produced. Analog multipliers 12 and 13 sequentially raise...
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6590437 |
Logarithmic amplifier
Plurality of linear amplifiers A 1, A 2, and A 3, input signal is applied to these linear amplifiers A 1, A 2, and A 3 and is applied to a comparator 30 carrying out level detection, and...
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6559705 |
Circuit arrangement
In order to provide a circuit arrangement ( 100 ) for generating and amplifying a DC signal, referred to as level voltage, whose value is essentially proportional to the logarithm of the voltage...
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6552591 |
Method and apparatus for processing a wide dynamic range signal
Method and apparatus are provided for processing a wide dynamic range analog signal which comprises a compressive nonlinear transfer function responsive to the average amplitude of the signal...
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6507233 |
Method and circuit for compensating VT induced drift in monolithic logarithmic amplifier
A temperature-compensated monolithic logarithmic amplifier includes a logarithmic amplifier cell ( 26 ) configured to produce a logarithmic voltage signal (V 3 ) representative of a difference...
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6401046 |
Modulated interface for remote signals
A circuit 17 for interfacing with a sensor 18 having a sensor input current and a modulated sensor current signal corresponding to a sensed condition. A control module 20 is coupled to the...
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6397161 |
Method for stabilizing output of rain sensor and protection method therefor
A rain sensor including light emitting means 7 for guiding light into a window glass so as to undergo total internal reflection within the window glass, light receiving means 8 for receiving...
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6313689 |
Power switching circuit with reduced interference radiation
A power switching circuit with reduced interference radiation includes at least one pair of low-side and high-side MOS power transistors, between which a load resistor is connected. One or at least...
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6265928 |
Precision-controlled logarithmic amplifier
A precision-controlled logarithmic amplifier having reduced interference parameters. In an embodiment, the invention comprises a logarithmic amplifier having an output signal providing a...
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6249170 |
Logarithmic gain control circuit and method
An improved logarithmic amplifier (100) and method in which a signal at an output (106) is logarithmic with respect to the voltage supplied at a gain control input (102). The logarithmic amplifier...
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6229375 |
Programmable low noise CMOS differentially voltage controlled logarithmic attenuator and method
A logarithmically controlled attenuator circuit includes a resistive attenuator having a single series resistive element connected between an input conductor and an output conductor, and a...
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6229374 |
Variable gain amplifiers and methods having a logarithmic gain control function
Variable gain amplifiers and methods having a logarithmic gain control function are disclosed. The variable gain amplifiers have a first inverse hyperbolic tangent stage having a current input...
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6215292 |
Method and device for generating an output current
A power rising electronic device receives an input current and supplies an output current that is a function of a power of the input current having a relative whole-number exponent. The power...
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6163198 |
Log-linear variable gain amplifiers and amplifier control apparatus and methods
Log-linear variable gain amplifiers and amplifier control apparatus and methods providing temperature compensated log-linear gain characteristics with a wide range of control for a current steered...
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6144244 |
Logarithmic amplifier with self-compensating gain for frequency range extension
A progressive-compression logarithmic amplifier, amplifier stage, and method for increasing the bandwidth of a differential-input progressive-compression logarithmic amplifier are disclosed. The...
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6104243 |
Integrated temperature-compensated amplifier circuit
In a fully integrated logarithmic amplifier, an input current is fed via a diode, and in a reference current branch parallel thereto, a constant current flows through a similar diode. A voltage...
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6066976 |
Apparatus and method for improved dynamic range
A logarithmic amplifier is provided with a calibration circuit to allow for current measurement over a wide-dynamic range that includes extremely low current levels in a manner which mitigates or...
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6031408 |
Square-law clamping circuit
A square-law clamping circuit (99, 120) sinks a current from an input/output terminal proportional to a square of a difference between a voltage thereon and a reference voltage. A first MOS...
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5977812 |
Circuit and method for providing a generally log logarithmic transfer function
A circuit and method for generating a generally logarithmic transfer function based upon switching signals. The circuit includes a plurality of transistors and a switch operatively connected to...
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5909129 |
Low cost microstrip phase detector
A low-cost microstrip phase detector that is photo-etched onto a circuit board is disclosed. The phase detector is used to detect the phase difference between two high-power radio frequency (RF)...
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5880618 |
CMOS differential voltage controlled logarithmic attenuator and method
A logarithmic attenuator circuit includes a resistive attenuator in which the series resistors are P-channel MOSFETs with gate electrodes connected to V DD and the parallel resistors are P-channel...
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5877645 |
Offset compensation circuit for integrated logarithmic amplifiers
A circuit for compensating for the input offset voltage of a logarithmic amplifier includes a digital comparator, a logic circuit, and a digital-to-analog converter (DAC) in a feedback loop. The...
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5818279 |
Circuit arrangement comprising a logarithmic transfer function
A circuit arrangement having a logarithmic transfer function between an input signal and an output signal in a predefined level range of the input signal circuit which has a very low power...
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5812008 |
Logarithmic converter
A power control circuit (10) contains a voltage controlled attenuator (16) in combination with a logarithmic converter (24) to produce linear amplification of an input signal (12) over as wide a...
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5805011 |
Self-calibration system for logarithmic amplifiers
Temperature and technology-independent self-calibrating monolithic logarithmic amplifier systems that use integrated cascades of current-summing or voltage-summing differential-limiter gain stages...
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5793244 |
Logarithmic conversion circuit
A logarithmic conversion circuit includes a narrow band generating unit consisting of a local oscillator (104) and a mixer (103) for receiving an output of the local oscillator and the input signal...
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5754013 |
Apparatus for providing a nonlinear output in response to a linear input by using linear approximation and for use in a lighting control system
An amplifier which outputs a nonlinear function in response to a linear input. The nonlinear response is a piece-wise linear approximation. The circuit includes an op amp which outputs a ramping...
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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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5714902 |
Polynomial function generation circuit
An electrical circuit for generating a polynomial function in response to a linear input signal is disclosed. The circuit in one embodiment comprises a primary and a secondary current mirror, with...
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5699004 |
Temperature compensation of logarithmic amplifiers in a sampled data system
Compensation is provided for temperature-effects intrinsic to a logging transistor in a logarithmic amplifier by applying a temperature-dependent term to a voltage reference of an analog-to-digital...
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5677561 |
Temperature compensated logarithmic detector
A temperature compensated logarithmic detector biased with a proportional to absolute temperature (PTAT) voltage produced in accordance with an area ratio of biasing transistors is disclosed....
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