Voltage or current controlled emitter-coupled multivibrator with

Oscillators – Solid state active element oscillator – Transistors

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331144, H03K 3282

Patent

active

058960708

ABSTRACT:
An emitter-coupled multivibrator oscillator circuit including a pair of main transistors (Q1,Q2) having a positive feedback, in which the base of each transistor is connected to the collector of the other transistor via buffer transistors (Q3,Q4). A capacitor (C) is connected between the emitters of the main transistors. The circuit further comprises pull-down transistors (Q5, Q6), cross-connected so that they are positively driven to alternate between a conducting and a non-conducting state according to the states of the main transistors. The frequency of the oscillator is adjusted by controlling the current (I1) passing through the capacitor (C). Additionally, a compensating current (Icom) is arranged to flow through the collector resistors (Rc1,Rc2) of the main transistors so that the total current passing through each resistor is essentially constant and independent of the control current (I1). This way the signal amplitude of the oscillator is not affected by the frequency control.

REFERENCES:
patent: 3665343 (1972-05-01), Thompson
patent: 3855551 (1974-12-01), Ishigaki et al.
patent: 4083019 (1978-04-01), Hamada et al.

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