Local oscillator for generating an HF signal for direct...

Details Local oscillator for generating an HF signal for direct... Local oscillator for generating an HF signal for direct...

2005-09-27

2005-09-27

Tieu, Benny (Department: 2642)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S318000, C455S323000, C455S141000

Reexamination Certificate

active

06950639

ABSTRACT:
A local oscillator for use in an optoelectronic distance measurement system for generating a narrow-band HF signal for direct signal mixing with a reception signal generated by an avalanche photodiode (2) from a light signal impinging on the latter, with the depletion layer capacitance (CAPD) of the avalanche photodiode (2), which varies due to different influences and specimen scatter, is incorporated, as an element which (co-)determines the oscillator frequency, in a controllable HF resonant circuit whose HF resonant frequency is determined, for example, by the adjustable divider ratio of a PLL-circuit (1) which is acted upon by a phase-locked reference oscillator (6) and which controls the capacitance (C) of a capacitance diode (3) connected in parallel with the depletion layer capacitance.

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W. K. Kulczyk and Q.V. Davis The Avalanche Photodiode as an Electronic Mixer XP 002040605.
Patent Abstract of Japan No. 58137304.

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