SU1251286A1 - Crystal generator - Google Patents

Abstract

The invention relates to radio engineering. The stability of generating two frequency signals is enhanced. The device contains two transistors 1 and 2, a diode 3, two resistors (P) 4 and 11, a capacitor 5, a quartz resonator (CU) 6, a current source 7, a resistive voltage divider 8, a parallel QC circuit 9, an emitter follower 10 and sequential LC-circuit 12. The mode of stable two-frequency oscillations is ensured by the presence of two self-oscillating rings containing their non-linear element — and the fulfillment of the conditions of phase and amplitude balance in each auto-oscillator ring. The device establishes a stable mode of two-frequency oscillations simultaneously on the first and one of the higher harmonics of CU 6. The goal is achieved by introducing P 11 and a serial LC circuit 12. 1 sludge. yu (L S

Description

The invention relates to a radio equipment and can be used low-frequency highly stable oscillators and piezoquartz frequency sensors.

The purpose of the invention is to increase the stability of generating signals of ear frequencies.

The drawing shows a random electrical circuit of the proposed quartz oscillator.

The quartz generator contains a first transistor 1, a second transistor 2, a diode 3, a resistor 4, a capacitor 5, a quartz resonator 6, a current source 7, a resistive voltage divider 8, a parallel RC circuit 9, an emitter follower 0, an additional resistor 11, sequential LC circuit 12.

Quartz generator works as follows.

The mode of stable two-frequency oscillations is ensured by the presence of two autogenerator rings containing their own nonlinear element, and when the conditions of phase and amplitude balancing in each autogenerator ring are fulfilled.

For the first ring (the base of the first transistor — the collector of the first transistor 1 — the collector of the second transistor 2 — tapping the resistive divider 8), the parameters of the resistive divider 8 of resistor 4 are chosen so that the amplitude balance conditions at the serial resonance frequencies are simultaneously at the first and highest harmonics resonator 6.

The second ring (emitter of the second transistor 2 — serial LC circuit 12 — emitter of the first transistor 1 — collector of the first transistor 1 emitter of the second transistor 2) is an LC generator whose parameters are chosen so that the oscillation frequency is close to the frequency one of the higher harmonics of the quartz o resonator 6.

Owing to the effect of tightening the frequency, the oscillation frequency is observed at the same harmonic of the order. Order 4424/56

Circulation 8 6

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Random polygons pr-tie, .g „Uzhgorod ul. Project, 4

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of the resonant cavity 6, on which a serial LC circuit 12 is tuned. In the quartz generator, a stable mode of two-frequency 5 oscillations is established simultaneously on the first and one of the highest harmonics of the quartz, resonator 6,

When connected to the output of a quartz-oscillator detector and a low-pass filter, a difference frequency can be obtained.

Claims (1)

Invention Formula A quartz oscillator containing the first and second transistors, a diode, one flash of which is connected to the collector of the first transistor, a resistor that is connected between the positive power line and the second diode of the diode, a capacitor whose pulse is connected to the emitter of the first transistor, a quartz resonator, which is connected between the second capacitor and the common bus, the current source that is connected between the emitter of the first transistor and the negative power bus, the resistive voltage divider that is connected between the collector rum of the second transistor and common bus, parallel RC circuit, one pin of which 1 is connected to the positive power bus, emitter follower, the input of which is connected to the collector of the second transistor, and the output of which is the output of the quartz oscillator, while the base of the first trazistor is connected to the tap of the resistive voltage divider, and the base of the second transistor is connected to the co-optic of the first resistor, the first and second transistors have an opposite type of structure, which is different in that and generating signals with two frequencies, it introduced an additional resistor which is connected between the second terminal of the parallel RC-circuit and the emitter of the second transistor, and serial LC-circuit which is connected between the emitters of the first and second transistors. Circulation 8 6 Subscription