Multiplexing instrumentation preamplifier

Details Multiplexing instrumentation preamplifier Multiplexing instrumentation preamplifier

1995-01-27

1996-12-17

Olms, Douglas W.

Multiplex communications

Pathfinding or routing

Through a circuit switch

330124R, 330147, 330148, 370 56, H04Q 154, H03F 368

Patent

active

055861148

ABSTRACT:
An oscilloscope preamplifier includes N inputs and Z outputs. A programmable cross-point multiplexer provides a first operating mode in which each of N inputs is connected to a different output thereby providing a preamplifier with Z channels, a second operating mode in which one input is multiplexed to all the outputs which are interleaved to maximize the sampling rate, and a range of operating modes in between. The programmable multiplexer includes a switching amplifier connected between each input and each output. Dials on the preamp select the mode by causing a microprocessor to program latches which activate or deactivate the switching amplifiers. A voltage divider is connected across inputs of the multiplexer to provide a programmable attenuator with selectable attenuation levels.

REFERENCES:
patent: 4313033 (1982-01-01), Walker et al.
patent: 4345251 (1982-08-01), Begeman
patent: 4716585 (1987-12-01), Tompkins et al.
patent: 4905238 (1990-02-01), Rinaldis
patent: 5367520 (1994-11-01), Cordell
patent: 5375604 (1994-12-01), Kelly et al.
patent: 5420534 (1995-05-01), Elabd

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