Texas Instruments Corporation

Glenn H Westphal

Mark V Wadsworth

Jimmie B Sherer

Richard K Hester

Malcolm John Bevan

Patrick Peter Siniscalchi

Donald Cook Richardson

William L McCardel

The asymmetric digital subscriber line receive channel includes: first and second external resistorsandcoupled to a telephone lineand; a coarse programmable gain amplifier CPGA formed in a low voltage process having inputs coupled to the first and second external resistorsand; and a fine programmable gain amplifier PGAcoupled to an output of the coarse programmable gain amplifier CPGA, and having a very fine gain trim adjustment to compensate for a mismatch between the external resistorsandand the coarse programmable gain amplifier CPGA.

ADSL front-end in a low voltage process that accommodates large line voltages

A sensor (1400) with radiation detectors (1421-1422) with two or more bolometer or photoconductor elements and bias polarity switching of one element to emulate mechanical chopping of input radiation. This electronic chopping permits higher chopping frequencies than mechanical chopping for bolometers because the scene settling time does not limit electronic chopping. The detectors may be within a single vacuum integrated circuit package with separate narrow passband filters for chemical spectral analysis.

Bolometer autocalibration

A spectrometer (2500) including a detector integrated circuit (2501) which includes a linear array (2503) of 128 adjoining 2 by 10 superpixel bolometers in a package base (2530) and under an infrared transparent lid (2510) with a graded interference filter (2511). Filter (2511) has a rectangular shape and is a passband filter with a center wavelength which varies linearly along the direction of the long sides which is also the long direction of the linear array (2503) of bolometers. The center wavelength varies by a factor of about 2 over the length of the linear array (2503).

Bolometer array spectrometer

A quartz arsenic cell having a stabilizing valve used to generate hot arsenic vapor which is flowed into liquid gallium, to provide a melt of liquid gallium arsenide from which a crystal can be pulled. The stabilizing valve prevents negative relative pressure from occurring in the quartz arsenic cell, and thus prevents the molten material from being sucked back up into the quartz arsenic cell.

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Plano, TX, United States of America

Glenn H Westphal