spannungsgesteuerte circuit and use of such a circuit for a spannungsgesteuerten oscillator

摘要

A voltage-controlled circuit includes a control voltage source for providing a variable control voltage, a first current source for providing a first current whose magnitude is changed with the variation of the control voltage, a first potential source for providing a first potential which depends on the magnitude of the first current, a second current source for providing a second current, a second potential source for providing a second potential which depends on the magnitude of the second current, and a differential amplifier circuit which is formed of a first transistor having a base coupled to the first potential source and a second transistor having a base coupled to the second potential source. An input signal is supplied to the emitter circuit of the first and second transistors, and an output signal is delivered from the collector circuit of the first or second transitor. The output/input characteristic of the differential amplifier circuit is changed by the control voltage. The first current source is provided with means for expanding the linear range of the output/input characteristic of the differential amplifier circuit vs. the control voltage.