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US 4,901,037 AGranted
Oscillator with amplitude stabilizing circuit
AssigneeU.S. Philips Corporation
InventorErnst Feller
Life of this patent
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Abstract
An amplitude stabilized oscillator which includes an amplifier having an input, an output, and a control terminal. The amplifier has a frequency determining feedback circuit connected between its output and input terminals, and has a control voltage produced by two opposite current sources applied to its control terminal. An amplitude detector detects the oscillator output amplitude during at most one half of each oscillation period and produces an amplitude stabilizing signal which is applied to one of the two current sources.
Claims5
An oscillator circuit comprising:
- an amplifier controlled by means of a control voltage on a control terminal and which comprises a feedback circuit coupled between an amplifier input and an amplifier output;
- an amplitude controller which comprises an amplitude detector for controlling the oscillation amplitude in dependence on a detected amplitude and a first and a second current source for supplying currents of mutually opposed polarity to the control terminal, at least one of the current sources being controllable by the amplitude controller in dependence on an amplitude which is detected during at the most one half of an oscillation period.
Dependencies are inferred from the claim text.