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US 6,275,686 B1Granted
Differential phase shift amplifier of electrical or physical quantities
AssigneeImogene Healy
InventorWilliam Hotine
Life of this patent
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Abstract
An amplifier system for electrical or physical quantities such as voltage or sound converts the quantity in a transducer to a differential phase shift of a high carrier frequency which is an analog equivalent of the quantity and multiplies the differential phase shift by conversion to a low frequency and frequency doubling back to the carrier frequency in successive stages by means of digital logic circuits.
Claims6
A differential phase shift amplifier system comprising:
- a source of a sine wave carrier frequency;
- a source of a square wave beat frequency higher than said carrier frequency;
- a source of a physical or electrical quantity;
- a transducer receiving said carrier frequency and said physical or electrical quantity and using resistive or reactive circuit means to convert said physical or electrical quantity to differential phase angles of said carrier frequency at two outputs;
- two amplifiers receiving said two carrier frequency outputs and having two square wave outputs differing differentially in their phase angle;
- two digital mixers receiving said amplifier outputs and said high beat frequency and having low difference frequency products differing differentially in phase;
- two frequency doubler circuit chains multiplying said low frequency mixer products to the carrier frequency and thus multiplying said phase differential by the chain multiplication factor;
- two chains of digital mixers and frequency doubler circuits further multiplying said differential phase angle of said carrier frequency to a desired value of phase or frequency differential which is an amplified analog equivalent of said physical or electrical quantity.
5 more elements
The method of amplifying a physical or electrical quantity using a differential amplifier system comprising:
- generating a sine wave carrier frequency;
- generating a square wave frequency higher than said carrier frequency;
- applying said physical or electrical quantity to a transducer receiving said carrier frequency;
- converting said physical or electrical quantity to differential phase angles of said carrier frequency at two outputs of said transducer;
- amplifying said two outputs to square waves;
- applying said two outputs to two digital mixers receiving said high beat frequency;
- applying the low difference frequency products of said two mixers to the inputs of two chains of frequency doubler circuits multiplying said low frequencies to the carrier frequency and thus multiplying said differential phase angle by the frequency multiplication factor;
- continuing the described process of down conversion and frequency doubling back to the carrier frequency in two circuit chains to further multiply said differential phase angle to a desired value of phase or frequency differential which is an amplified analog of said physical or electrical quantity.
5 more elements
A differential amplifier system for amplifying a physical or electrical quantity by multiplying its analog equivalent comprising:
- means for generating a sine wave carrier frequency;
- means for generating a square wave beat frequency higher than said carrier frequency;
- a source of a physical or electrical quantity;
- transducer means receiving said carrier frequency and said physical or electrical quantity and converting said quantity to an analog equivalent value of differential phase angles of said carrier frequency at two outputs;
- amplifier means receiving said two outputs and having two square wave outputs differing differentially in phase;
- digital mixer means receiving said two outputs and said high beat frequency and having difference products of two low frequency square waves differing differentially only in their phase angle;
- digital frequency doubling means receiving said low frequency square waves and multiplying said differential phase angle by the frequency doubling multiplication factor while multiplying the low frequency to the carrier frequency;
- digital circuit means continuing this process of down conversion and frequency doubling as described to multiply said differential phase angle and thus amplifying the analog value of said physical or electrical quantity.
5 more elements
Dependencies are inferred from the claim text.