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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...
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...
7417485 Differential energy difference integrator  
Embodiments of the invention are generally directed to a high-speed differential energy difference integrator (EDI) for adaptive equalizers. In an embodiment, the EDI includes two differential...
7375577 Mixer capable of detecting or controlling common mode voltage thereof  
A mixer capable of detecting or controlling a common mode voltage thereof, includes at least: a mixing module for mixing a first set of differential signals and a second set of differential signals...
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...
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...
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...
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...
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...
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...
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...
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...
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...
6731918 Signal strength detecting device with little temperature dependence  
A signal strength detecting device includes a logarithmic amplifier and an amplitude detector. A constant current source whose current is proportional to the absolute temperature is used as a...
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...
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...
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...
RE37138 Log-polar signal processing  
The invention relates to a method and an arrangement intended for radio communication systems and effective in digitalizing and subsequently processing numerically arbitrary radio signals. The...
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...
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...
5839060 Logarithmic level detector and a radio receiver  
A logarithmic level detector that provides a very accurate level detector output signal that is greatly insensitive to temperature and process spread. The logarithmic level detector includes a...
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...
5680070 Programmable analog array and method for configuring the same  
A programmable analog array (10) comprises an array (11) of cells, each cell including analog circuitry (12), a switch control circuit (18), and a digital storage element (16). The switch control...
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....
5631594 Tunable logarithmic amplifier circuit using cascaded triple-tail cells  
A logarithmic amplifier circuit including a first triple-tail cell for rectifying an initial input signal to produce a first rectified output signal and a first amplified output signal, a second...
5561392 Logarithmic amplifier employing cascaded full-wave rectifiers including emitter-coupled pairs with unbalanced emitter degeneration as logarithmic elements  
A logarithmic amplification circuit is provided which is composed of a differential amplifier, a plurality of full-wave rectifiers including two half-wave rectifiers connected so as to have their...
5521542 Logarithmic amplifier circuit using triple-tail cells  
A logarithmic amplifier circuit is provided, which contains a differential amplifier, a first rectifier for rectifying an initial input signal and for generating a first rectified output signal, a...
5506537 Logarithmic amplifying circuit based on the bias-offset technique  
A logarithmic amplifying circuit with a reduced power dissipation and suitable for applying to an integrated circuit. The logarithmic amplifying circuit has cascade-connected differential...
5489868 Detector cell for logarithmic amplifiers  
A detector cell for a logarithmic includes a differential pair of inputs across which a input signal V 0 is applied across. The detector cell also includes a pair of differential outputs. The...
5481218 Logarithmic converter  
A logarithmic convertor based on a nonlinear successive detection principle has a temperature-compensated biassing arrangement and a large operating range due to a d.c. feedback network for offset...
5475328 Logarithmic intermediate frequency amplifier circuit operable on low voltage  
In a logarithmic intermediate frequency amplifier circuit including first through M-th intermediate frequency amplifiers which are connected in cascade and first through M-th double balanced...
5471173 Cascaded amplifier having temperature compensation  
A cascaded amplifier is comprised of a number of amplifying stages connected in cascade such as the dual emitter-coupled amplifier shown. A first pair of transistors (14,20) provides limiting...
5471166 Logarithmic amplifying circuit using quadritail cells  
A logarithmic amplifying circuit with a wide input dynamic range using cascade-connected differential amplifiers, a rectifier connected to each of the amplifiers and an adder for adding the output...
5467046 Logarithmic intermediate-frequency amplifier  
A C-MOS logarithmic IF amplifier is provided which comprises a plurality of IF amplifiers cascade-connected to each other through a first coupling capacitor, a plurality of rectifiers each...
5451895 Wideband amplifier with logarithmic output characteristic  
A wideband amplifier which employs a plurality of cascaded logarithmic amplifier stages under the control of a digital signal processor which nulls offset voltages. In one aspect of the invention,...
5414313 Dual-mode logarithmic amplifier having cascaded stages  
A dual-mode successive detection amplifier for providing a first output signal corresponding to a logarithmic function of a RF input signal, and for providing a second limited RF output signal is...
5298811 Synchronous logarithmic amplifier  
A synchronous progressive-compression type logarithmic amplifier includes one or two channels of amplifier/limiter stages and a corresponding multi-stage synchronous demodulator circuit to provide...
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...
5070303 Logarithmic amplifier/detector delay compensation  
An amplifier/detector chain logarithmically amplifies an input signal as well as compensates for delays generated by necessary bandwidth restrictions. A plurality of amplifiers are connected in...
5057717 Logarithmic amplifier circuit  
A logarithmic amplifier circuit has n (n>1) stages of differential amplifiers, n+1 in number, of rectifying circuits, a differential pair of bipolar transistors having different emitter sizes in...
5049829 Logarithmic amplifier with sequentially limiting amplifier stages  
In order to improve the large signal handling capability of a logarithmic amplifier comprising amplifier stages successively performing their limiting actions in response to an increase of the...
4990803 Logarithmic amplifier  
A multi-stage logarithmic converter of the "successive-detection" or "progressive-compression" type including circuitry providing an accurate, temperature-stabilized logarithmic transfer function....
4933641 Extended dynamic range logarithmic if amplifying apparatus and method  
A logarithmic I.F. amplifier having a common input terminal for receiving input signals with the method of construction including a pair of channels connected in a parallel configuration, the first...
4908529 Logarithmic amplifier comprising MESFET distributed amplifiers connected in cascade  
Logarithmic amplifiers which have a logarithmic transfer characteristic are used, for example, in microwave instrumentation. Such an amplifier comprises a series of MESFET distributed amplifiers...
4885483 Logarithmic amplifier  
Logarithmic amplifiers which have a logarithmic transfer characteristic may be used in microwave instrumentation. Such an amplifier includes a series of MESFET distributed amplifiers (DA1-DA8)...
4812772 Spectrum analyzer and logarithmic amplifier therefor  
The spectrum analyzer comprises an input for receiving eletromagnetic signals in a predetermined first frequency band and an image reject mixer for reducing the power of images of the received...
4716316 Full wave, self-detecting differential logarithmic rf amplifier  
A logarithmic rf amplifier includes a plurality of cascaded stages each including a differential amplifier which performs full-wave rectification of the rf signal and a circuit for providing a...
4691381 Receiver for amplitude modulated signals  
A receiver for measuring the amplitude of input amplitude modulated signals over an 80 dBm range and producing a digital output. The amplifier comprises a power splitter to which an input signal is...
4531069 Logarithmic amplifiers  
A logarithmic amplifier with a large range of input signal magnitude at high frequency. The amplifier comprises a number of similar stages arranged in cascades. Each stage has a logarithmic...
RE30781 Logarithmic amplifier  
A logarithmic amplifier comprising a common-emitter type transistor amplifier circuit with an emitter resistor and a collector load. A bias voltage is applied to the base of the transistor through...
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