Decompression and air consumption computer
First Claim
1. A method for amplifying a differential signal and converting said differential signal into a single ended signal comprising the steps of:
- (a) applying said differential signal across first and second input terminals;
(b) coupling a first lead of a capacitor to said first input terminal;
(c) coupling a second lead of said capacitor to a first reference input of an amplifier and a single ended output of said amplifier;
(d) decoupling said output of said amplifier from said capacitor;
(e) coupling said second input terminal to a second input of said amplifier to produce an amplified single ended output signal.
4 Assignments
0 Petitions
Accused Products
Abstract
An improved SCUBA diving gauge. A pictograph display is provided which has a shape which conveys the type of information being displayed. The pictograph has the shape of a SCUBA tank for a tank pressure display and the shape of a person for a display of nitrogen absorbed. Pressure transducers coupled to the SCUBA tank and the external water provided the pressure readings required to produce the respective displays. The differential signal from the transducer is supplied to a processor through an auto-zeroing circuit. The auto-zeroing circuit uses a capacitor initially coupled to an amplifier reference input and single ended output to store an offset voltage. During a measurement, the capacitor is disconnected from the amplifier output and has its other lead coupled to a full scale value of the differential input to produce an output signal which is a ratio.
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Citations
16 Claims
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1. A method for amplifying a differential signal and converting said differential signal into a single ended signal comprising the steps of:
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(a) applying said differential signal across first and second input terminals; (b) coupling a first lead of a capacitor to said first input terminal; (c) coupling a second lead of said capacitor to a first reference input of an amplifier and a single ended output of said amplifier; (d) decoupling said output of said amplifier from said capacitor; (e) coupling said second input terminal to a second input of said amplifier to produce an amplified single ended output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for amplifying a differential signal comprising:
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first and second input terminals for receiving said differential signal; an amplifier having a reference input, a signal input and a single ended output; a capacitor having first and second leads, said second lead being coupled to said reference input of said amplifier; first switch means for coupling said first input terminal to said first lead of said capacitor; second switch means for coupling said second lead of said capacitor to said amplifier output; and third switch means for coupling said second input terminal to said signal input of said amplifier. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification