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US 5,166,647 AGranted
Low-noise oscillator
AssigneeAEL Defense Corp.
InventorLeon Riebman
Life of this patent
Estimating the term…
Abstract
A low-noise oscillator has a resonant circuit for generating a signal at a desired frequency. A linear amplifier and a limiter are electrically connected to the resonant circuit at first, second and third locations. A buffer amplifier is electrically connected to the resonant circuit at a fourth location and applies the signal generated by the resonant circuit to a load. The first, second, third and fourth locations are selected to minimize the impedance from those locations to ground at 1/f frequencies.
Claims6
An oscillator having low phase noise and low 1/f noise, comprising
- (a) resonant circuit means for generating a signal at a desired frequency,
- (b) linear amplifier means electrically connected to the resonant circuit means at first and second locations thereon,
- (c) limiter means electrically connected to the resonant circuit means at a third location thereon, and
- (d) buffer amplifier means for applying the signal generated by the resonant circuit means to a load and electrically connected to the resonant circuit
- means at a fourth location thereon, said first, second, third and fourth locations being selected to minimize impedance from said locations to electrical ground at frequencies at which substantial 1/f noise is present and to minimize resistive loading of the resonant circuit means and noise input to the resonant circuit means from the buffer amplifier.
2 more elements
A low phase noise, low 1/f noise oscillator, comprising
- (a) resonant circuit means for generating an oscillator signal at a desired frequency,
- (b) a low-noise linear amplifier connected to the resonant circuit means for receiving an output therefrom and for generating an amplified output signal at said desired frequency,
- (c) a low-noise buffer for buffering said amplified output signal from the low-noise linear amplifier to a load, the buffer having an output to said load,
- (d) feedback means for feeding back a negative feedback signal comprising a portion of the amplified output signal from the low-noise linear amplifier to the input of a limiter means for limiting said feedback signal to a preselected amplitude,
- (e) a low-noise linear amplifier for receiving the feedback signal limited by the limiter means and for amplifying said signal, said low-noise linear amplifier having an output connected to said resonant circuit means,
- said resonant circuit means, linear amplifier, low noise buffer and feedback means being interconnected to minimize loading of the resonant circuit means and maximize the oscillator-signal-to-noise ratio at the output of the low-noise buffer to the load.
3 more elements
Dependencies are inferred from the claim text.