Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Patent
1996-03-29
1998-04-21
Faile, Andrew
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
34082569, 34082572, H04B 116
Patent
active
057429022
ABSTRACT:
A door operator includes a low noise, low radiation emission but high sensitivity super-regenerative receiver. The low radiation emission of the receiver allows the installation of plural operators in close proximity. The door operator receiver includes a super-regenerative circuit apparatus with a super-regenerative circuit and a resistively loaded cascode preamplifier stage that phase shifts a received RF signal and tightly couples the preamplifier stage output to the super-regenerative circuit. A cascode circuit arrangement of a field effect transistor (FET) and a bipolar transistor provides forward gain and very high reverse direction gain or isolation for the preamplifier stage. Preferably, the resistive loading elements and the phase-shifting elements are coupled to the cascode circuit between the transistors. The present invention also relates to a cascode preamplifier stage, a super-regenerative circuit, and a RF receiver each including such a preamplifier stage.
REFERENCES:
patent: 3359240 (1967-12-01), Deming
patent: 3631498 (1971-12-01), Bachhuber, Jr.
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patent: 4921466 (1990-05-01), Matsumoto et al.
patent: 5105162 (1992-04-01), Fleissner et al.
Figure A showing preamplifier circuit on sale more than one year before the filing date of this application.
Figure B showing preamplifier circuit on sale more than one year before the filing date of this application.
Faile Andrew
GMI Holdings Inc.
Onuaku Christopher
LandOfFree
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