Performing multiplication using an analog-to-digital converter
First Claim
Patent Images
1. A multiplier circuit to multiply a first signal with a second signal, comprising:
- an analog-to-digital converter having a first input and a second input, wherein the first input is to receive the first signal; and
an inverting circuit having an input to receive the second signal, and an output connected to the second input of the analog-to-digital converter, wherein the inverting circuit includes a linear regulator having a voltage input for connection to a power supply voltage, and a voltage output connected to the second input of the analog-to-digital converter, and wherein the linear regulator has an adjustment input for connection to the second signal,wherein an output value produced by a combination of the analog-to-digital converter and the inverting circuit is approximately a multiplication of the first signal and the second signal.
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Abstract
A multiplier circuit to multiply a first signal with a second signal includes an analog-to-digital converter that has a first input and a second input. The first input is to receive the first signal. The multiplier circuit also has an inverting circuit having an input to receive the second signal, and an output connected to the second input of the analog-to-digital converter. An output value produced by a combination of the analog-to-digital converter and the inverting circuit is approximately a multiplication of the first signal and the second signal.
21 Citations
16 Claims
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1. A multiplier circuit to multiply a first signal with a second signal, comprising:
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an analog-to-digital converter having a first input and a second input, wherein the first input is to receive the first signal; and an inverting circuit having an input to receive the second signal, and an output connected to the second input of the analog-to-digital converter, wherein the inverting circuit includes a linear regulator having a voltage input for connection to a power supply voltage, and a voltage output connected to the second input of the analog-to-digital converter, and wherein the linear regulator has an adjustment input for connection to the second signal, wherein an output value produced by a combination of the analog-to-digital converter and the inverting circuit is approximately a multiplication of the first signal and the second signal. - View Dependent Claims (2, 3, 4, 5)
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6. A multiplier circuit to multiply a first signal with a second signal, comprising:
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an analog-to-digital converter having a first input and a second input, wherein the first input is to receive the first signal; and an inverting circuit having an input to receive the second signal, and an output connected to the second input of the analog-to-digital converter, wherein an output value produced by a combination of the analog-to-digital converter and the inverting circuit is approximately a multiplication of the first signal and the second signal, wherein the inverting circuit includes an operational amplifier and resistors to invert the second signal, wherein the output of the inverting circuit is to provide the inverted second signal, wherein the operational amplifier has an inverting input for connection to the second signal through a first of the resistors, wherein the operational amplifier has an output connected to the second input of the analog-to-digital converter, and wherein a second of the resistors is connected between the inverting input and the output of the operational amplifier. - View Dependent Claims (7, 8, 9)
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10. A system comprising:
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a controller; and a multiplier circuit comprising; an analog-to-digital converter having a first input and a second input, wherein the first input is to receive a first signal; an inverting circuit to receive a second signal and to invert the second signal, the inverting circuit having an output connected to the second input of the analog-to-digital converter, the output to provide the inverted second signal, wherein an output value produced by a combination of the analog-to-digital converter and the inverting circuit is approximately a multiplication of the first signal and the second signal, and wherein the first signal is representative of an electrical current, and the second signal is a voltage, and wherein the controller is to receive the output value that is an indication of power; and a power management system to retrieve the output value from the controller, and in response to the output value, to effect a power management action. - View Dependent Claims (11, 12, 13)
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14. A method of multiplying a first signal with a second signal, comprising:
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receiving the first signal at a signal input of an analog-to-digital converter, wherein the analog-to-digital converter further has a second input; receiving the second signal at an input of an inverting circuit, wherein an output of the inverting circuit is connected to the second input of the analog-to-digital converter, wherein receiving the second signal at the input of the inverting circuit comprises receiving the second signal at the inverting circuit that includes one of an operational amplifier and a linear regulator; and providing an output from the analog-to-digital converter in response to the first signal and the output of the inverting circuit, wherein the output of the analog-to-digital converter is a digital value representing an approximate multiplication of the first signal and the second signal. - View Dependent Claims (15, 16)
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Specification