Multiplier circuit and method of operation therefor
AssigneeSouth African Micro-Electronic Systems (Proprietary) Limited
InventorArtur W. Suntken
Life of this patent
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Abstract
A multiplier circuit for obtaining the product of two input signals has a modulator for modulating a first input signal to produce an intermediate pulse train whose pulse density is dependent on the amplitude of the first input signal. A combiner derives from the second input signal and the intermediate pulse train a composite signal whose average value is equal to the product of the first and second input signals.
Claims18
A multiplier circuit for obtaining the product of first and second input signals comprising:
- a first oversampling analog-to-digital converter for modulating said first one of said input signals to produce an intermediate pulse signal whose pulse density is dependent on the amplitude of said first input signal;
- a second oversampling analog-to-digital converter for modulating said second one of the input signals to produce an output pulse signal whose pulse density is dependent on the amplitude of the product of said first and second input signals;
- and
- a switching device for receiving said second input signal, said switching device being coupled to both said first and second oversampling analog-to-digital converters for controlling the polarity of said second input signal applied to said second oversampling analog-to-digital converter by means of said intermediate pulse signal produced by said first oversampling analog-to-digital converter.
A method of obtaining the product of first and second input signals comprising the steps of:
- modulating said first one of the input signals by means of a first oversampling analog-to-digital converter to produce an intermediate pulse signal whose pulse density is dependent on the amplitude of the first input signal;
- modulating the second one of the input signals by means of a second oversampling analog-to-digital converter to produce an output pulse signal whose pulse density is dependent on the amplitude of the product of the first and second input signals;
- and.
- controlling the polarity of the second input signal applied to said second oversampling analog-to-digital converter with said intermediate pulse signal produced by said first oversampling analog-to-digital converter.
Dependencies are inferred from the claim text.