Self adjusting tuned resonant photodiode input circuit
First Claim
Patent Images
1. A self adjusting tuned resonant photodiode input circuit comprising:
- a photodiode;
wherein an active feedback signal adjusts a reverse bias voltage across said photodiode to tune a resonant frequency to a center frequency.
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Abstract
A self adjusting tuned resonant photodiode input circuit wherein an active feedback signal adjusts a reverse bias voltage across a photodiode to tune a resonant frequency to a center frequency. This results in a stable improved passband of the receiver front end.
29 Citations
24 Claims
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1. A self adjusting tuned resonant photodiode input circuit comprising:
a photodiode; wherein an active feedback signal adjusts a reverse bias voltage across said photodiode to tune a resonant frequency to a center frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A self adjusting tuned resonant photodiode input circuit comprising:
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a photodiode; an over coupled double tuned network responsive to said photodiode; wherein an active feedback signal adjusts a reverse bias voltage across said photodiode to tune a resonant frequency to a center frequency of said over coupled double tuned network. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. In an FM receiver a self adjusting tuned resonant photodiode input circuit comprising:
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a photodiode; an over coupled double tuned network responsive to said photodiode; wherein an active feedback signal adjusts a reverse bias voltage across said photodiode to tune a resonant frequency to a center frequency of said over coupled double tuned network. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. In an FM receiver a self adjusting tuned resonant photodiode input circuit comprising:
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a photodiode; an over coupled double tuned network responsive to said photodiode; said over coupled double tuned network comprises a transformer having capacitive mutual coupling; wherein an active feedback signal adjusts a reverse bias voltage across said photodiode to tune a resonant frequency to a center frequency of said over coupled double tuned network such that a nonsymmetrical amplitude response of received signal strength indicator above said center frequency and below said center frequency defines a differential voltage causing a bias voltage change across said photodiode.
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Specification