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US 4,906,836 AGranted
Integrated circuit using logarithmic amplifier
AssigneeHamamatsu Photonics K.K.
InventorsTomitaka Yamashita, Mikio Kyomasu
Life of this patent
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Abstract
An integrated circuit includes an operational amplifier having inverting and noninverting input terminals, a first logarithmic amplifier having inverting and noninverting input terminals, and a second logarithmic amplifier having inverting and noninverting input terminals. The output of the first logarithmic amplifier is connected to the noninverting input terminal of the second logarithmic amplifier, and the output of the second logarithmic amplifier is connected to the inverting input terminal of the operational amplifier.
Claims8
An integrated circuit for comparing first and second signals, comprising:
- an operational amplifier having inverting and noninverting input terminals, the output of said operational amplifier being coupled to the inverting input terminal of said operational amplifier, and the output of said operational amplifier containing a signal representing a comparison of said first and second signals;
- a first logarithmic amplifier having inverting and noninverting input terminals, the output of said first logarithmic amplifier being coupled to the inverting input terminal of said first logarithmic amplifier, and the inverting input terminal of said first logarithmic amplifier receiving said first signal;
- a second logarithmic amplifier having inverting and noninverting input terminals, the output of said second logarithmic amplifier being coupled to the inverting input terminal of said second logarithmic amplifier, and the inverting terminal of said second logarithmic amplifier receiving said second signal, the output of said first logarithmic amplifier being coupled to the noninverting input terminal of said second logarithmic amplifier, and the output of said second logarithmic amplifier being coupled to the inverting input terminal of said operational amplifier.
Dependencies are inferred from the claim text.