| http://www.w3.org/ns/prov#value | - FIG. 1B is a schematic diagram of the chopped amplifier 12 of FIG. 1A. As shown in FIG. 1B the input 18 is coupled to the minus input of an operational amplifier 42 through a switch 43 controlled by FCHOP and to the positive input of the operational amplifier 42 through a switch 43' controlled by FCHOP. The input 20 is coupled to the minus input of an operational amplifier 42 through a switch 44'
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