Coded data generation or conversion – Analog to or from digital conversion – Multiplex
Reexamination Certificate
2006-05-09
2006-05-09
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Multiplex
C341S155000
Reexamination Certificate
active
07042376
ABSTRACT:
A scanning front end of a measurement device using single-pole, double-throw switches (SPDT) to multiplex input signals into signal conditioning circuitry. The scanning front end may also include N input channels and N input resistors, which may be connected to the conditioning circuitry via N SPDT switches. The signal conditioning circuitry may include an inverting amplifier. The first output terminal of each of the SPDT switches is connected to the summing node of the inverting amplifier. The summing node of the inverting amplifier may remain at zero volts and an amplifier side of each of the N input resistors may remain at zero volts, which may eliminate large common mode voltage swings and reduce a settling time of the amplifier when switching from one channel to another. Also, a voltage drop across each of the N input resistors may be equal to an input voltage of a corresponding input channel.
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Intersil, “Ultra Low ON-Resistance, Low Voltage, Single Supply, Quad SPDT (Dual DPDT) Analog Switch”, Data Sheet, Nov. 5, 2004, http://www.intersil.com/data/fn/fn6094.pdf (11 Pages).
Orozco Luis F.
Regier Christopher G.
Barnie Rexford
Hood Jeffrey C.
Lewin Mario J.
Mai Lam T.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
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