Wide-band tuned input circuit for infrared receivers
First Claim
Patent Images
1. A wide-band tuned photodiode input circuit comprising:
- a photodiode; and
a double tuned network having an input and an output, said double tuned network responsive to said photodiode, said input capacitively coupled to said photodiode, said double tuned network having mutually dependent stages;
wherein said double tuned network increases noise immunity and increases frequency selectivity at a given frequency.
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Abstract
A wide-band tuned photodiode input circuit comprising: a photodiode; an step up double tuned network having an input and an output. The double tuned network is responsive to the photodiode. The input is capacitively coupled to the photodiode.
87 Citations
20 Claims
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1. A wide-band tuned photodiode input circuit comprising:
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a photodiode; and a double tuned network having an input and an output, said double tuned network responsive to said photodiode, said input capacitively coupled to said photodiode, said double tuned network having mutually dependent stages; wherein said double tuned network increases noise immunity and increases frequency selectivity at a given frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wide-band tuned photodiode FM receiver input circuit comprising:
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a photo diode; and a step up double tuned network having an input and an output, said step up double tuned network responsive to said photodiode, said input capacitively coupled to said photodiode, said double tuned network having mutually dependent stages; wherein said double tuned network increases noise immunity and increases frequency selectivity at a given frequency. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A wide-band tuned photodiode FM receiver input circuit comprising:
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a photodiode; a step up double tuned network comprising a transformer having an input and an output, said input and said output having a capacitive mutual coupling, said step up double tuned network responsive to said photodiode, said input capacitively coupled to said photodiode, and said double tuned network having mutually dependent stages; a resistor coupled across said output for damping said step up double tuned network to obtain critical coupling; wherein said double tuned network increases noise immunity and increases frequency selectivity at a given frequency. - View Dependent Claims (20)
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Specification