SU744719A1 - Synchrosignal generator - Google Patents

Description

(54) SYNCHRONESIGNER GENERATOR

The invention relates to a technique of digital magnetic recording and can be used to generate signal signals, the frequency and phase of which monitors the speed of rotation of the carrier in the disk drive. . A phase synchronization device is known that contains a ring: auto-tuning, two elements of comparison, the pulse selector l. A disadvantage of the known device is the complexity of the DESIGN 1C of limited functional capabilities. It is also known a device containing two phase detectors, the outputs of which through filters are connected to the corresponding inputs of a differential amplifier, the output of which through a controlled generator is connected to the first inputs of phase detectors, W a driver of the reference signals, which includes an inverter and two an element of coincidence, the output is each COG. About which is connected by the second input of the corresponding phase detector, and the first input of the first element of the match is connected to the output of inverter 2. The disadvantage of this device is its limited functionality, concluding with the inability to receive signals for adjusting the speed of rotation of the parquet discs and indication of synchronism. ... The purpose of the invention is to expand the functionality. The goal is achieved by the fact that the clock signal generator contains two phase detectors, the outputs of which are connected via filters to the corresponding inputs of the differential amplifier, the output of which through a controlled generator connects to the phase inputs of the phase detectors, and the onopHtik signal generator, which includes a inverter and two coincidence elements, {the output of each coeeDDtHeH with BTOPEIM input of the corresponding phase detector, and the first input of the first coincidence detector is connected to the output of the inverter, ormirovatel.Opornyh sigygshov introduced trigger Yuchidta, delay elements, and two monostable flip-flop, the flip-flop input coupled to imidta schinoy INPUT, and the output-input to D-

pHffepoB and through the delay element with a charge: the first trigger, the first inlet of the second match element and the input of the inverter, the output of which is connected to the C input of the second trigger, the direct output of the first trigger, and the inverted output of the second trigger through the single vibrator are connected to the second inputs of the elements coincidence, R-BXO3 of the first trigger, S-in of the second trigger, the output of the controlled generator connected to the output bus.

FIG. 1 shows the function of a sync signal generator circuit; in fig. 2 - time diagrams of it

ryotiG - .--- ---- ---; l ....

The sync signal generator contains forshrower 2 reference signals / phase detectors 3 and 4 which are connected to the input of 1 and through which filters 5 and b of low frequencies are connected to the inputs of the differential amplifier 7, the output of which is connected to the output bus 9 and the first inputs of phase detectors 3 through the generator 8 and 4. Shaper 2 contains

trigger 10 Imidta, the output of which can be connected to the output bus

11 and through the delay element 12 is connected to the C-input of the trigger 13, the O-input of which is connected to the output 11 of the flip-flops and the D-input of the trigger 14, the C-input of which is connected through the inverter 15

with the release of the element 12 delay. The direct output of the trigger 13 and the inverse output of the trigger 14 are podklecheny to the inputs of the one-shot 16, the output of which is connected to one of the inputs of the elements 17 and 18 of coincidence, the others went to kW krykh Connected to the output of the element

The 12 delays and the input of the inverter are 15, respectively, and the outputs are connected to the secondary inputs of the corresponding phase detectors, the R-input of the trigger 13 and the 5-input of the trigger 14 are connected to the output of the single-channel. 16 -:: -; - lt-;:::: 1: The device operates as follows.

Upon receipt of the bus 1 pulses (figure 2, a), characterizing the mutual arrangement of the reading head

and synchrodisk (if the head is located in the center between two connected synchrodiscs, then the positive and negative ypu; li6y equal in amplitude. When you irono BKH in the direction of one of the most expensive, increase the gain (increase the number of values of the corresponding pulse for the ironoKKH; proportionally reduced), at the output of a Schmidt trigger, which has a hysteresis characteristic, rectangular pulses are formed (Fig. 2, b), the frequency KoVopax is equal to the following: to the follow pulse of the input pulses. l create a stable phase support,. elements. 12 for-der gski, triggers 13 and 14 and inverter

15 are used to isolate stable moments corresponding to the second half-waves of dipulses.

The delay element 12 delays the signals of the Schmidt trigger for a time t more than the half-wave length of the pulse | s, but less than the half-period of the following pulses of one polarity. The function of comparing the pulses from the outputs of the Schmidt trigger and the delay element is performed by the trigger 13, the ac output of the Schmidt trigger and the delayed delayed element 12 output is the trigger 14. Their output signals are shown in FIG. 2, g and d, respectively. The duration of these signals is determined by the values of the response delay of the corresponding trigger 13 or 14 and the activation value of the one-shot 16.

These pulses correspond to the moments of transition through the threshold levels of only the second half-wave of the pulses, and at the output of the trigger 13 pulses are formed, corresponding to positive dipoles, and at the output of the trigger 14 to negative pulses at the input.,

The output signals of the flip-flops 13 and 14 trigger a single vibrator 16, at the output of which pulses are formed (Fig. 2, e) of a fixed duration. These pulses, depending on the direction of the recorded transition (Fig. 2, c), pass through the coincidence circuit 17 (Fig. : 2:, g), or through a coincidence circuit 18 (Fig. 2, i). The resulting two pulse sequences are used as reference signals by the phase-locked loop system, the frequencies including phase detectors 3, 4, filters S, 6, differential amplifier 7 and controlled oscillator 8. Controlled oscillator 8 continuously produces symmetrical square signals (Fig. 2 , k), arriving at the output bus 9 and along the feedback circuit to one of the inputs of the phase detectors.

If the reference signal from driver 2 comes to the input of the phase detector, then on. its output selects a portion of the feedback signal, i. clock signal that coincides with the reference signal. The output signals of phase detectors 3 and 4 in the synchronism mode are shown respectively in FIG. 2, l and fig. FIG. 2 m Since these signals are applied to the antiphase inputs of the differential amplifier 7 through filters and have opposite effects on the frequency of the controlled oscillator, the stable synchronism in the phase-locked loop system is possible only when sampling the phase detectors of the 3 clock sections in the neighborhood of their negative differences and 4 - plots in the vicinity of positive differences. Only when this condition is fulfilled is always provided the overall negative sign of the transfer coefficient on the closed loop of the phase-locked loop, guaranteeing the convergence of the process of adjusting the phase of the clock signal. Thus, the generator output clock is uniquely phase-linked to reproducible dipoles.

The output bus signal 11 can be used for precision control of the speed of rotation of the disk pack, and the automatic indication of synchronism can be carried out by simply comparing the output state of the reference driver with a delayed copy of the sync signal on the output bus 9..

Formula of invention

A clock signal generator containing two phase detectors, the outputs of which are connected via filters to the corresponding inputs of a differential amplifier, the output of which is connected to the first inputs of phase detectors via a controlled generator, and a driver of reference signals

which includes an inverter and two coincidence elements, the output of each of which is connected to the second input of the corresponding phase detector, and the first input of the first coincidence element is connected to the output of the inverter, characterized in that, in order to enhance the functionality, Schmidt trigger, delay elements, two flip-flops and odiovibrator, the Schmidt trigger input is connected to the input bus, and the output from the D-inputs of the triggers and through the delay element to the C-input of the first .trigger, the first The input of the second matching element and the input of the inverter, the output of which is connected to the G input of the second trigger, the direct output of the first trigger and the inverse output of the second trigger, are connected via a one-to-one interface to the second inputs of the matching elements, the R input of the first trigger and the S input of the second trigger, the output of the controlled generator is connected to the output bus.

five

Sources of information taken into account in the examination

1. US Patent No. 3879753, cl. 360-51, 1975.

, 2. USSR author's certificate

0 №539331, cl. 6 11 В 27/18, 1975 (prototype). / bff & SKO center 11 I r-THLn iM W wm. 1 / 9.2 l I L i Lii I 11 h-H jMi

Claims (1)

Claim A clock generator containing two phase detectors, the outputs of which are connected through filters to the corresponding inputs of a differential amplifier, the output of which through a controlled generator is connected to the first inputs of the phase detectors, and a reference signal shaper, which includes an inverter and two coincidence elements, the output of each of which connected to the second input of the corresponding phase detector, and the first input of the first coincidence element 5 is connected to the inverter output, characterized in that, in order to expand In terms of functionality, the Schmidt trigger, delay elements, two triggers and a one-shot are introduced into the reference signal generator, the Schmidt trigger input connected to the input bus, and the output with trigger D inputs and through the delay element with the C input of the first trigger, the first input the second coincidence element and the inverter input, the output of which is connected to the C-input of the second trigger, the direct output of the first trigger and the inverse output of the second trigger through a one-shot * 20 rotor are connected to the second inputs of the coincidence elements, the R-input of th flip-flop and the S-input of the second flip-flop controlled oscillator output is connected to the output bus. 25 Sources of information. taken into account during the examination 1. US patent No. 3879753, CL. 360-51, 1975. , 2. Copyright certificate of the USSR 30 No. 539331, cl. G 11 B 27/18, 1975 (prototype). Fig 1