SU1298935A1 - Controlled generator - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the stability of the output signal in frequency tuning mianasoHe. A generator containing two opposite-connected varicaps 1 and 2, an inductance coil 3 with a tap, a positive feedback element 4, a field-effect transistor (PT) 5, a resistor 6, a PT 7. E 4, which is connected between the flow connection point PT 5 with resistor 6 and tap coil 3, m. made using a capacitor, inductance coil or autotransformer. It is also possible to implement E 4 by combining the listed E. 1 sludge. Pete. iWy u co 00 co co SP

Description

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The invention relates to radio engineering and can be used in radio transmitting or receiving devices, as well as in devices for measuring technology or automation.

The aim of the invention is to increase the stability of the output signal in the frequency tuning range.

The drawing shows the principal electrical circuit of the proposed controlled generator,

The control generator contains two opposite-connected varicaps 1 and 2, an inductance plug 3 with a tap, a positive feedback element 4 f5, the first field-effect transistor 5, the resistor 6 and the second field-effect transistor 7,

The controlled generator operates as follows.

When the supply voltage is switched on, due to the presence of a positive feedback circuit in the controlled oscillator, self-oscillations are excited, the frequency of which is determined by the tuning frequency of the parallel Lcr-oscillatory circuit containing two varicaps 1 and 2 and an inductor 3 with a tap.

Positive feedback element 4, which is connected between the source connection point of the first field-effect transistor 5 with the resistor 6 and the tap-off of the inductor 3 with the outgoing transistors 5 and 7, is combined in the controlled oscillator with which the amplitude is maintained. output fluctuations. The load is connected to the connection point of the drain of the first and the source of the second field-effect transistors, and the frequency control signal of the controlled oscillator is supplied, for example, through a resistor to the connection point of two varicaps 1 and 2 of the parallel LC oscillating circuit,

Claims (1)

Invention Formula Controllable generator, maintenance of a field-effect transistor, an inductor with a tap, in parallel of which two opposite-connected varicaps are connected, a positive feedback element that is connected between the tap of the inductor and the source of the first field-effect transistor , the first and second leads of the inductor are connected respectively to the gate of the first field-effect transistor 30 and to the common bus, and the junction point of the varicaps is the control input its controlled signal generator, characterized in that. 20 25 which is to increase stability house, can be performed with the use of the output signal in the range of the capacitor capacitance, the inductive-frequency coil, introduced a second field or autotransformer. Power transistor, gate, source and drain It is also possible to perform element 4- by which are connected respectively to false feedback by com-gate of the first field transistor of the listed elements. 40p, the drain of the first field-effect transistor supply to the source drain and the power line, another output of the nojifeBOro transistor 5 is fed to the resistor connected to the common bus, and through the second field-effect transistor 7, the drain point of the first transistor and the same type conduction, which is the current of the second field-effect transistors in the - and the first field-effect transistor 5. The output of the controlled generation of the gates of the first and second on-iTOpa, Editor A, Gratillo Order 899/60 Compiled by N, Pavlov Tehred M. Khodanych Proofreader G, Reshetnik Circulation 902, Subscription BNIIPI USSR State Committee inventions and discoveries 13035, Moscow, Raushsk nab ,, d, 4/5 Production and printing company, Uzhgorod, st. Project, 4 the left transistors 5 and 7 are combined, and a negative feedback is created in the controlled oscillator, which maintains the amplitude of the output oscillations. The load is connected to the connection point of the drain of the first and the source of the second field-effect transistors, and the frequency control signal of the controlled oscillator is supplied, for example, through a resistor to the connection point of two varicaps 1 and 2 of the parallel LC oscillating circuit, Invention Formula Controllable generator, maintenance of a field-effect transistor, an inductor with a tap, in parallel of which two opposite-connected varicaps are connected, a positive feedback element that is connected between the tap of the inductor and the source of the first field-effect transistor The first and second terminals of the inductor are connected respectively to the gate of the first field-effect transistor and to the common bus, and the connection point of the varicaps is the control input a signal controlled oscillator, wherein.