SU1651378A1 - Frequency converter - Google Patents

Abstract

The invention relates to a pulse technique and can be used in synthesizers (frequencies. The purpose of the invention — improving the uniformity of output frequency pulses when the control frequency code is changed — is achieved by introducing a combination adder 2 and organizing new structural connections. The device contains a accumulating adder 1, a divisor 4 codes, dial 5 code, input and output bus 6 and 3, 1 Il.

Description

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The invention relates to a pulse technique and can be used in frequency synthesizers.

The purpose of the invention is to improve the uniformity of the output frequency pulses with a change in the (control) frequency code.

The drawing shows the electrical structure of the device.

The frequency converter contains a accumulating adder 1. whose outputs are connected to the first group of inputs of the combinational adder 2, the output of the higher bit of which is connected to the output bus 3, the second group of inputs is connected to the outputs of the divider 4 codes, the information inputs of which are connected to the outputs of the generator 5 codes and with information inputs accumulating adder 1, the clock input of which is connected to the bus 6 clock pulses.

The frequency converter operates as follows.

Claims (1)

The occurrence of each pulse on bus 6 is accompanied by an increase in the content of adder 1 by the value of the output code of the setter 5. Thus, the repetition rate of the process at the outputs of adder 1 is proportional to the frequency of the pulses on bus 6 and the size of the code at its information inputs (and inversely proportional to the capacity of adder 1) . In the absence of a divider 4 in the device and a corresponding connection of the first group of inputs of adder 2 with the outputs of adder 1, an output signal of the square wave type will be generated at the output of the higher bit of adder 2. However, changing the code at the outputs of the setting device 5 in the process of accumulating this code of the adders 1 will result in changing the phase of the signal on bus 3. To compensate for this change in phase, part of the code from the outputs of the setting device 5 through divider 4 is fed to the second group of inputs of the adder 2, to compensate for the signal phase jumps to bus 3 when changing the code value at the outputs of the setter 5. Such compensation is equivalent to taking into account the derivative of the frequency code, taking into account the code delay in the adder 1 by the value of the pulse period from the bus 6. The selection of the division factor of divider 4 and The capacitors of adders 1 and 2 allow for the complete matching of pulse sequences on bus 3 generated by the device before and after changing the code at the outputs of the setter 5. To ensure the monotonous nature of the output signal, the maximum code value at the outputs of the setpoint 5 must be less than half of the capacity of the adder 1. Formula of the invention A frequency converter comprising a code setter, the outputs of which are connected to the information inputs of the accumulating adder and code divider, clock bus and output bus, from Characterized by the fact that, in order to increase the uniformity of the output frequency pulses when the frequency code changes, a combination adder is entered into it, the first and second groups of inputs of which are connected to the outputs of the accumulating adder, respectively, the clock input of which is connected to the clock bus and code divider, the output cjapiuero bit connected to the output bus.