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Transistor oscillator circuit having a resonant-circuit or crystal-controlled oscillator realized by a feedback differential amplifier and provided for driving a mixture stage including a pair of transistors forming the oscillator and having a current-carrying output connected to a respective input

Transistor oscillator circuit having a resonant-circuit or crystal-controlled oscillator realized by a feedback differential amplifier and provided for driving a mixture stage including a pair of transistors forming the oscillator and having a current-carrying output connected to a respective input of the mixture stage, the latter being of symmetrical construction, a low pass filter also connected to the current carrying output of the oscillator, a common control amplifier having an output, and respective inputs connected to the oscillator via the low pass filter, and means for feeding back the output of the control amplifier to the oscillator in the sense of negative feedback.

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Integrable oscillator circuit having a mixing stage driven by an external signal and an oscillating stage formed by a differential amplifier having a first and a second emitter-coupled transistor, both of the transistors being connected by the emitters thereof to a reference potential supplied by a

Integrable oscillator circuit having a mixing stage driven by an external signal and an oscillating stage formed by a differential amplifier having a first and a second emitter-coupled transistor, both of the transistors being connected by the emitters thereof to a reference potential supplied by a d-c voltage source and by the collectors thereof via a respective resistor to a supply potential supplied by the d-c voltage source, the base terminal of the first transistor of the differential amplifier being controlled by a frequency-determining control member, and the base terminal of the second transistor of the differential amplifier being connected to the reference potential via a capacitor, the collector of the second transistor forming a signal output delivering an electric oscillation generated in the oscillating stage, and including a feedback connection between the collector of the second transistor and the base of the first transistor, the feed-back connection being via the frequency-determining control member, comprising a control amplifier having a plurality of inputs, the respective collector of the first and second transistors being connected to respective input terminals of the mixing stage as well as via a respective lowpass filter to the inputs, respectively, of said control amplifier, said control amplifier having an output fed back to the oscillating stage in the sense of a d-c-wise negative feedback connection so that the collector potentials of said first and second transistor as well as the potential at said input terminals of the mixing stage operate with minimal offset.