Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1989-02-27
1990-12-18
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341127, 341135, 341136, 341144, 341146, 341158, 341162, 330252, 330253, H03M 144, H03M 172, H03F 345
Patent
active
049789597
ABSTRACT:
An operational amplifier is provided and includes at least two input terminals of one polarity and another input terminal of the opposite polarity. The amplifier includes an amplifying portion which comprises a differential section for receiving input signals applied to the input terminals. The differential section includes at least two differential amplifiers which form difference signals from the input signals. A summing section receives the difference signals and forms a sum result therefrom. A multiplying section provides an amplification gain to the sum result to form an output signal of desired gain. The amplifier is also provided with a feedback for applying an input signal to one of the input terminals, the output signal. The amplifier can be configured to provide amplification gains of 2, 1/2, -1 and 1. In view of the amplification gains equal to 2 and 1/2 respectively, there is also provided an analog to digital converter and a digital to analog converter both of which comprise a cascaded series of operational amplifiers.
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Chong Chu P.
Smith Kenneth C.
Vranesic Zvonko G.
O'Rourke Thomas A.
Shoop Jr. William M.
University of Toronto - Innovations Foundation
Williams Howard L.
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