Analog multiplier circuit
AssigneeNeu Edge Ltd
InventorsAnthony Ian STANSFIELD, Yuhang SONG, Walter Thomas Rombold GOODWIN
Life of this patent
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Abstract
An analog multiplier circuit for performing multiply and scaling operations comprises a differential amplifier, at least two storage circuits, a summing circuit; and an exponentiating circuit. In response to receiving a first control signal, receiving as input an analog signal output by the differential amplifier and storing a value derived from the analog signal. In response to receiving a second control signal, outputting a storage analog signal derived from the stored value. The summing circuit receives storage analog signals from the storage circuits, and outputs an analog signal substantially proportional to a sum of the input storage analog signals.
Claims20
An analog multiplier circuit for performing multiply and scaling operations comprising:
- a differential amplifier arranged to receive as input a first analog signal and a second analog signal, the second analog signal an input signal to the analog multiplier circuit, and arranged to output a third analog signal substantially proportional to a difference between the first and the second analog signal;
- at least two storage circuits, each:
- in response to receiving a first control signal, receiving as input the third analog signal output by the differential amplifier and storing a value derived from the third analog signal;
- and
- in response to receiving a second control signal, outputting a storage analog signal derived from the stored value;
- a summing circuit arranged to receive as input the storage analog signals from the at least two storage circuits respectively, and arranged to output a fourth analog signal substantially proportional to a sum of the input storage analog signals;
- and
- an exponentiating circuit arranged to receive as input the fourth analog signal, and arranged to output a fifth analog signal, wherein the fifth analog signal is substantially proportional to an exponential of the fourth analog signal, and is arranged to be an output of the analog multiplier circuit,
- wherein the first analog signal is a feedback signal associated with the fifth analog signal, and wherein the exponentiating circuit is operable to cause a storage circuit of the at least two storage circuits to store a value substantially proportional to a logarithm of the second analog signal.
An analog multiplier circuit comprising:
- at least two storage circuits, each:
- comprising a differential amplifier arranged to receive as input a same first analog signal and a same second analog signal, and arranged to output a differential output analog signal substantially proportional to a difference between the first and the second analog signal;
- in response to receiving a first control signal, receiving as input the differential output analog signal output by the differential amplifier of the storage circuit, and storing a value derived from the received analog signal;
- and
- in response to receiving a second control signal, outputting a storage analog signal derived from the stored value;
- a summing circuit arranged to receive as input the storage analog signals from the at least two storage circuits respectively, and arranged to output a fourth analog signal substantially proportional to a sum of the input storage analog signals;
- and
- an exponentiating circuit arranged to receive as input the fourth analog signal, and arranged to output a fifth analog signal, wherein the fifth analog signal is substantially proportional to an exponential of the fourth analog signal, and is arranged to be an output of the analog multiplier circuit,
- wherein the first analog signal is a feedback signal associated with the fifth analog signal, and wherein the exponentiating circuit is operable to cause a storage circuit of the at least two storage circuits to store a value substantially proportional to a logarithm of the second analog signal.
Dependencies are inferred from the claim text.