Instrumentation amplifier with automatic gain control

Details Instrumentation amplifier with automatic gain control Instrumentation amplifier with automatic gain control

H - Electricity

03

G

H03G 3/20 (2006.01)

Patent

CA 2066705

2066705 9105406 PCTABS00004 This invention concerns an instrumentation amplifier capable of implemenating automatic control means for the gain of an amplifier (1), which can further be read as the value of the set gain in conjunction with the readout of the amplifier output voltage. The amplifier uses parallel feedback resistors (3) of which only one at a time is connected. The selection is performed on the basis of comparison of the output voltage against a reference voltage level (6, 7). An up/down counter is used to monitor the result of the comparison and to control a multiplexer (2) that connects the resistors (3) over the amplifier (1). The amplifier is best suited to measurements in which multiple low-cost amplifiers must be used and the amplitude of the incoming analog signal varies by several orders of magnitude.

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