RU2042260C1 - Electronically tunable oscillator - Google Patents

Abstract

FIELD: radio electronics. SUBSTANCE: oscillator has self-excited oscillator 1, variable capacitors 2,3,4, power circuit resistors 5,6,7, capacitors 8,9,10, first and second microstrip line sections 11,12, first and second isolating components 13,14, choke coil 15, first and second diode switches 16,17; wave impedance of second and first microstrip line sections are Q₂ and Q₁ and Q₂< Q₁, respectively. EFFECT: enlarged stepless frequency control range. 1 dwg

Description

 The invention relates to radio engineering and can be used to generate microwave oscillations.

 The aim of the invention is to expand the range of smooth frequency adjustment.

 The drawing shows a circuit diagram of a generator with electronic frequency tuning.

 The electronically tuned frequency generator comprises a transistor 1, first, second and third varicaps 2, 3, 4, power supply resistors 5, 6, 7, first, second and third capacitors 8, 9, 10, first and second segments of the microstrip line 11, 12, the first and second decoupling elements 13, 14, the inductor 15, the first and second diode switches 16, 17.

 A generator with electronic frequency tuning operates as follows.

When applying the unlocking voltage E _control. from the first source of control voltage to the first diode switch 16 (while the second diode switch 17 is closed), the second varicap 3 and the first segment of the microstrip line 11 with wave resistance are connected to the base of transistor 1.

When a modulating voltage E _{cm2 is} applied to the second varicap 3 and a supply voltage to the transistor 1 at a fixed bias voltage E _cm to the second varicap 2, microwave oscillations with a variable frequency in the range f ₁ , f ₂ (f ₂ > f ₁ ) are generated.

When applying the unlocking voltage K _upr2 to the second diode switch 17, the third varicap 4 and the second segment of the microstrip line 12 with wave impedance Q _{2 are} connected to the base of transistor 1. Moreover, the value of Q ₂ <Q ₁ . When the modulating voltage E _{cm3 is} switched on to the third varicap 4 with a fixed voltage E _cm to the first varicap 2, microwave oscillations with a variable frequency in the range f ₂ , f ₃ (f ₃ > f ₂ ) are generated.

The jump in the operating frequency range up is due to the fact that the wave impedance Q _{2 is} less than Q ₁ . By choosing Q _2, it is easy to match the upper frequency of the lower range and the lower frequency of the upper range f ₂ . Thus, the overall frequency tuning range is increased.

Claims (1)

ELECTRONIC FREQUENCY CONTROL GENERATOR containing a self-oscillator on a transistor, which is connected according to a common collector circuit, a first varicap included in the transistor's collector circuit, second and third varicaps, the first and second diode switches, the first and second segments of the microstrip line, the first and second sources control voltage, the first capacitor, one output of which is connected to the base of the transistor, the second and third capacitors, the first and second decoupling elements, characterized in that, in order to expand the melting range frequency tuning, the first segment of the microstrip line, the second varicap, the second capacitor, the first and second diode keys, the third capacitor, the third varicap and the second segment of the microstrip are connected in series, while the connection point of the first and second diode keys is connected directly to the second terminal of the first capacitor and through the inductor to the common bus, the first control voltage source is connected through the first decoupling element to the connection point of the second capacitor and the first diode switch, w The second control voltage source is connected through the second decoupling element to the connection point of the second diode switch and the third capacitor, and the wave resistances of the second and first segments of the microstrip line, respectively, Q ₂ and Q _{1 are} interconnected by the relation Q ₂ <Q ₁ .