SU1067594A1 - Sawtooth voltage generator - Google Patents

Abstract

POWER VOLTAGE VOLTAGE, containing a storage capacitor, the first plate of which is connected to the current output of a two-terminal current detector and the first electrode of the discharge key, and the second with a second-key discharge electrode, the device has a pattern, and it is a mix with a voltage switch, and there is a pattern, the voltage switch, and there is a pattern, the voltage switch, and the device has a pattern, and there is a pattern, the voltage switch, and there is a pattern, the voltage switch, and the pattern has been set, the device has a target, and the device has a target with a secondary switch, and the device has a reset switch and the register has been set with a target with a voltage switch. , increasing the amplitude stability of the sawtooth voltage at external synchronization of the sawtooth voltage by variable frequency pulses, a time delay block, a gene Pulse generator, the output of which is connected, with the counting input of the pulse counter, whose outputs through the register are connected to the control inputs of the current-stabilizing two-pole device, performed with an inversely proportional current dependence on the control code, and the setting input of the pulse counter via the time delay unit is connected to a synchronization bus, a synchronization input of the register and a control input of the bit's bit.

Description

The invention relates to a pulse technique and can be used in scanners of electronic oscilloscopes, in television, in communication, etc. A generator of a sawtooth voltage g containing two connected in series storage capacitors, a charging resistor, an electronic switch, an emitter follower for stabilizing the charge current and connected in series with a source of reference voltage, a compressor, the input of which is connected to the output of a sawtooth generator , and an integrated circuit, the output of which is connected to the charging resistor tl, However, this sawtooth generator is characterized by low speed in relation to the change in h clock pulses. This is due to the fact that the recovery time of the amplitude of the sawtooth voltage after the jump of the frequency of the synchronizing pulses to the constant time of the integrating circuit, which is sufficient for sufficiently maintaining the amplitude of the saw voltage. must be many (several tens of times longer than the period of the latter. 1 The closest to the proposed is a sawtooth voltage generator containing a storage capacitor connected to the output of a controlled current-stabilizing D1 of the two-port network and the output of the dongle switch, the control unit of the slope of the sawtooth voltage consisting from a series-connected code-analog converter and a reversible counter, a trigger and AND logic elements, and a comparison device, the output of which is through OR logic elements with Connected to the input key of the discharge key, and the inputs are connected respectively to the output of the sawtooth amplitude control unit, consisting of a register and a code-voltage converter, and a storage capacitor L2J. I.,. A disadvantage of the known sawtooth generator. inconsistency of the amplitude of the pilot voltage when using this device in the external synchronization mode. If the synchronizing pulses are applied to the control input of the discharge key, then the amplitude of the sawtooth voltage is depends on the frequency of these pulses. The purpose of the invention is to increase v speed with a simultaneous increase in the stability of the amplitude of the saw-tooth voltage while out-of-time synchronization of the sawtooth voltage with variable frequency pulses. The goal is achieved by the fact that a saw-tooth voltage generator containing a storage capacitor, the first plate of which is connected to the output of the current-stabilizing two-terminal and the first electrode of the discharge switch, and the second is connected to the second electrode of the discharge switch, pulse counter and register, a temporary block is entered A pulse generator, the output of which is connected to the counting input of the Pulse counter, the outputs of which through the register are connected to the control inputs of the current-stabilizing two-pole device, Loaded with an inversely proportional current dependence on the control code, and the trigger pulse input is connected via a time delay block to the synchronization bus, the clock input of the register and the control input of the bit switch. .In FIG. 1 shows a structural electrical circuit of a sawtooth generator; in fig. 2 time diagrams, according to the device operation. The sawtooth generator contains a storage capacitor 1 connected to the output of the current-stabilizing two-terminal network 2 and. the output of the bit key 3, as well as a pulse counter 4, a register 5, a time delay block 6, a pulse generator 7, the output of which is connected to the counter input of the counter. 4 pulses, the outputs of which through the register 5 are connected to the control inputs of the current-stabilizing two-terminal network 2, the device has a synchronization bus 8 connected through a time delay unit b to the installation input of the pulse counter 4 and directly to the synchronizing input of the discharge key 3....,;,. The sawtooth generator operates as follows. Synchronization pulses are received on the synchronization bus 8 (Fig. 2a), on receipt of each 3 of which the discharge key 3 operates and discharges the storage capacitor 1. At the output of the temporary delay unit 6, pulses (Fig. 26) are shifted relative to the sync for some time . During the period of synchronized pulses, the counter 4 carried out the counting of pulses (Fig. 2c) of the gene -. Ator 7 pulses. At the instant of time the number of pulses counted by counter 4 for the period of the synchronizing signal is rewritten to register 5. At time 4; (, the counter is reset. The dependence on time of the number in register 5 is shown on 1 4 4 (Fig. 2d1. This number is proportional to the duration of the sync pulse period. The code-controlled current-stabilizing two-pole device generates a charging current inversely proportional to this number and, therefore, inversely proportional to the period and directly proportional to the frequency of synchronizing pulses. It is a time dependence of the sawtooth voltage on the accumulator capacitor. The number K written to register 5 is K (T / t) + 0 V (1) where m is the period of synchronizing: - pulses; t is the period of the pulse generator 7 (Fig. 2b, Diagram 3); h O is the sampling error (the charging current stabilized by the current stabilizing control set by the digital terminal 2 is. U where is the weight current; y is the right code a two-terminal listeering current, which has the capacity for a unit on its control. the entrance. The amplitude of the sawtooth voltage is. ,,, UC-Pf - 7 4A-DFS C, (/ 1 "-9k.)

and C3V

(where C is the capacity of the storage capacitor, Considering that –1 8 1, we get m - lot)) Obviously, the maximum possible error 1 / K will be the smaller, the higher the frequency of high-frequency pulses at the generator output 7. The presence of a sampling error This is due to the fact that the number of pulses, counted by counter 4 for period T, can only be an integer, while the ratio of periods T and T in general can be fractional. Thus, the amplitude of the sawtooth voltage in a steady state, within the known accuracy, is constant, does not depend on the frequency f 1 1 / T of synchronizing pulses and is (with the accuracy described above), Ljjt, (5) From the diagrams in FIG. 2, it is clear that the sawtooth generator generates a stepwise decrease in the frequency of the synchronizing signal over a single period, which is a significant improvement in performance compared to known devices. The presence of a pure lag is due to The fact that during any period of sawtooth voltage in register 5 is recorded the number K, counted during the previous period. The positive effect of the use of the invention is the possibility of obtaining a synchronized voltage of constant amplitude at a variable frequency of the synchronizing signal.

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Claims (1)

SILVER VOLTAGE GENERATOR, comprising a storage capacitor, the first lining of which is connected to the output of a current-stabilizing two-terminal device and the first electrode of the discharge key, and the second to the second increasing the stability of the amplitude of the sawtooth voltage with external synchronization of the sawtooth voltage by pulses of variable frequency, a time delay block is introduced into it, the pulses, the output of which is connected, with the counting input of the pulse counter, the outputs of which are connected through the register to the control inputs of the current-stabilizing two-terminal device, made with an inverse-proportional dependence of the current on the control code, and the installation input of the pulse counter is connected to the synchronization bus through a time delay unit, the synchronizing input of the register and the control input of the bit key. m joint venture