Oscillators – Solid state active element oscillator – Transistors
Patent
1997-05-21
1998-09-01
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331117R, 331183, 331177V, 332136, 381 3, H03B 512, H03C 322, H03L 500
Patent
active
058015922
ABSTRACT:
An oscillator circuit is provided for stabilizing the amplitude of a HF oscillation of an audio signal. In such an oscillator circuit, an audio signal having a frequency in the range of 20 Hz . . . 20 kHz is coupled into the oscillator circuit, is modulated with a high frequency and is emitted in the form of an RF audio signal having a frequency of more than 2 MHz. Such an oscillator circuit is used for instance in an infrared transmitting unit, wherein a low frequency audio signal is transformed into a higher frequency infrared signal. The higher frequency audio signals are transmitted via infrared channel to an appropriate receiving unit--for instance to infrared head phones--which comprises a receiving unit having an appropriate demodulator and preferably also a stereo-decoder in order to reproduce the low frequency audio signals. The oscillator for stabilizing the amplitude of a high frequency oscillation comprises a resonant circuit which is coupled with a first transistor having a base terminal, an emitter contact, and a collector contact. The first transistor develops an output voltage at the emitter contact which is fed back into a base circuit of the first transistor. The collector contact of the first transistor is coupled to a supply voltage source. The supply voltage source is coupled to the base terminal of the first transistor via a resistor. The emitter contact of the first transistor is coupled with the base terminal of a second transistor. The second transistor has a collector contact which is connected to the base terminal of the first transistor for controlling the voltage at the base terminal of the first transistor.
REFERENCES:
patent: 3321715 (1967-05-01), Bloch
patent: 3982210 (1976-09-01), Gehrke
Mann Wolfgang
Schaefer Horst
Grimm Siegfried H.
Sennheiser electronic GmbH & Co. KG
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