Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
1999-01-11
2001-08-14
Trost, William (Department: 2683)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S076000, C455S084000, C455S081000, C455S119000, C455S127500, C455S341000, C330S252000, C327S355000, C327S356000, C327S357000
Reexamination Certificate
active
06275686
ABSTRACT:
BACKGROUND OF THE INVENTION
Previous voltage amplifier systems have been subject to the masking effect of input circuit noise which has effectively limited the sensitivity threshold. A further previous problem has been the stable detection and amplification of very small static or dynamic physical or electrical quantities. Input semiconductor noise is generally present and amplification of small voltages has resulted in equal amplification of the masking semi-conductor noise in previous systems. Also, in previous systems, physical quantities are converted to voltages in order to amplify them and thus are also subject to the noise limitation. A better amplification system would not use voltage as the amplification medium.
SUMMARY OF THE INVENTION
The present novel amplification system amplifies a quantity that noise cannot duplicate or mask. Recurring phase of a carrier frequency is such a quantity. The new amplifier system to be described uses a novel input quantity to differential phase angle transducer with an associated frequency down conversion and frequency doubling differential phase shift amplifier chain with noise rejection and unconditional stability. Due to the cancellation of common mode effects in this differential arrangement, noise cannot affect the system or appear at the differential output. This novel amplifier system has unconditional stability and practically infinite gain.
OBJECTS OF THE INVENTION
The object of the invention is to provide an amplification system which is capable of practically infinite gain with unconditional stability and freedom from noise, able to amplify D.C. and A.C. voltages and all physical quantities by use of novel differential transducers converting these voltages and quantities to a differential phase shift of an A.C. carrier, and then amplifying this phase shift by down conversion and frequency multiplication until it is a frequency shift which can be multiplied and converted to an analog value. Although differential amplifier advantages and principles, together with phase multiplication have been known in the previous art, this new system combines these principles in a novel manner to overcome noise and stability problems of the previous art and furnish great amplification.
REFERENCES:
patent: 4156196 (1979-05-01), Someno et al.
patent: 4270206 (1981-05-01), Hughes
patent: 5722053 (1998-02-01), Kornfeld et al.
patent: 5896562 (1999-04-01), Heinonen
Ferguson Keith
Imogene Healy
McKown Daniel C.
Trost William
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