Analog Devices,inc.

Lewis W Counts

A Paul Brokaw

Derek F Bowers

Lawrence M DeVito

Alex Gusinov

Scott A Wurcer

Douglas W Babcock

Robert A Duris

JoAnn P Close

James G Staley

A circuit for providing a DC output equal to the RMS value of a time-varying input signal, the circuit including: (i) an RMS-to-DC converter for producing the DC output and (ii) a high-order low-pass filter comprising at least first and second low-pass filters connected in series to cooperatively reduce at least one of ripple in the DC output, ripple in an denominator feedback loop, or DC error in the DC output.

Dynamic improvement in RMS to DC converters

A circuit for varying the temperature of a first bipolar transistor in order to thermally compensate for self-heating effects of an associated device in a common signal path with the first transistor, the first transistor being configured within an isolated collector region. The circuit includes a second bipolar transistor provided within the isolated collector region and thermally coupled to the first transistor, the second transistor operable for providing heat to the first transistor to alter the temperature to a predetermined level, thus changing the operational voltage characteristics of the first transistor so as to minimize shifts in offset voltage.

Circuit and method of providing thermal compensation for a transistor to

A monolithic IC chip having a differential amplifier comprising a pair of JFETs with their top and back gates electrically isolated to provide a low-leakage-current input to the top gates. The amplifier includes independent bias circuitry for setting the potentials of the JFET back gates to a level close to that of the top gates. This circuitry includes resistive means coupled to the source electrodes of the input JFETs, and operable to establish a low-noise bias point for the back gates. The bias circuitry includes a reference current source comprising a pair of JFETs identical to the input JFETs and arranged to provide a gate-to-source voltage to match that of the input JFETs.

Very low input current JFET amplifier

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Lexington, MA, United States of America

Lewis W Counts