Sum of product circuit and inclination detecting apparatus
AssigneeAdvantest Corporation
InventorsKazuyuki Maruo, Tadashi Shibata
Life of this patent
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Abstract
A sum of product circuit (20) which adds up two input voltages, each of which is multiplied by the prescribed coefficients. The sum of product circuit (20) has a ν MOS transistor (50), a first and a second capacitance (C1, C2), and an output terminal (86). The ν MOS transistor (50) includes a drain (70), source (72), and a floating gate (74). The first and a second capacitance (C1, C2) connects each of two input voltages to the floating gate (74) by capacity coupling. The output terminal (86) outputs a voltage realized between a resister element (R0) and the ν MOS transistor (50). A constant voltage is applied between the drain (70) and the source (72) through the resister element (R0).
Claims8
A sum of product circuit, which outputs a sum of product value that adds a value multiplying a first input voltage by a cosine value cos θ at a prescribed angle θ and a value multiplying a second input voltage by a sine value sin θ at said prescribed angle θ, comprising:
- a ν MOS transistor which has a drain, a source, and a floating gate;
- a first condenser which connects said first input voltage to said floating gate by capacity coupling and having a capacitance of said cosine value cos θ;
- a second condenser which connects said second input voltage to said floating gate by capacity coupling and having a capacitance of said sine value sin θ;
- a resister element which is connected to said ν MOS transistor;
- and
- an output terminal which outputs an electric potential between said resister element and said ν MOS transistor;
- wherein said sum of product value is output from said output terminal by applying a constant voltage between said drain and said source through said resister element.
Dependencies are inferred from the claim text.