RU215204U1 - FREQUENCY SYNTHESIZER - Google Patents

Abstract

The utility model relates to a frequency synthesizer for controlling two-coordinate acousto-optical deflectors in a wide range of ambient temperatures with a high speed of tuning the values of the synthesized frequencies. The frequency synthesizer contains two frequency synthesis channels. The first frequency synthesis channel contains a high-speed frequency synthesizer connected to a low-pass filter, which is connected to an analog multiplier, then to a band-pass filter and a power amplifier, and to a switch. The second frequency synthesis channel also contains a high-speed frequency synthesizer connected to a low-pass filter, which is connected to an analog multiplier, then to a band-pass filter, then to a preamplifier and a power amplifier, both frequency synthesis channels are connected to an interface calculator that receives a signal from the control bus , the calculator interface is also connected to the switch. The technical result of the utility model is to provide the ability to control two-coordinate acousto-optic deflectors in a wide range of ambient temperatures at a high speed of tuning the values of the synthesized frequencies. 1 w.p. f-ly, 1 ill.

Description

The utility model relates to a frequency synthesizer for controlling two-coordinate acousto-optical deflectors in a wide range of ambient temperatures with a high speed of tuning the values of the synthesized frequencies.

Frequency synthesizers for various applications are known from the prior art, for example, a digital frequency synthesizer (see RU2275735, publ. 27.04.2006) (1). The digital frequency synthesizer consists of a digital computational synthesizer, a low-pass filter connected in series, and a mixer. The digital synthesizer includes an intermediate frequency lumped selection filter, the input of which is connected to the output of the low-pass filter, and the output to the first mixer input, the first high-frequency multichannel switch, the input of which is connected to the mixer output, N high-frequency lumped selection filters, where N is at least two, the inputs of which are connected to N outputs of the first high-frequency multichannel switch, the second high-frequency multichannel switch, the input of which is connected to the N outputs of high-frequency filters of lumped selection, and the output is the output of a digital frequency synthesizer, as well as M local oscillators, where M is at least two, the outputs of which connected to the inputs of the newly introduced third high-frequency multichannel.

The proposed analog has a low signal power and increased requirements for the spectral purity of the signal. Such a synthesizer will not be able to provide the purpose of the claimed device, namely, to control acousto-optic deflectors in a wide range of ambient temperatures.

Somewhat closer in purpose is the control system of an acousto-optic device (US7580182B2, 08/25/2009) (2), which includes an acousto-optic device having an acoustic transducer and configured to save a number of design parameters for the parametric tuning algorithm. The system includes a frequency synthesizer connected to the acousto-optic device and configured to supply a radio frequency tuning signal to the acousto-optic device through an acoustic transducer. The programmable controller is connected to the acousto-optic device and the frequency synthesizer and is configured to read specific design parameters and obtain a second set of parameters including one or more environmental parameters, specific tuning parameters, and user-defined operating parameters. The programmable controller is also configured to apply design-specific parameters and other parameters to a design-specific parametric tuning algorithm to select an RF tuning signal that optimizes a user-specified performance parameter.

System (2) contains a device similar to the claimed one, however, the type of frequency synthesizer used in it differs from the claimed one.

The closest analogue of the claimed device is a method and a signal synthesizer for controlling an acousto-optic element, (see WO2018197546A1, publ. 11/01/2018) (3). The signal synthesizer serves to control the acousto-optic crystal of the acousto-optic element. The acousto-optical element also has a piezoelectric transducer, which causes mechanical vibrations of the crystal. In particular, an amplifier that can be adjusted is connected after the synthesizer and serves to amplify the analog output signal provided by the synthesizer. The synthesizer has a memory device that stores a sequence of signal values, for example, in the form of a list or table with signal values. The signal value sequence has a series of signal values (ie, numerical values), for example, in the form of intensity values, which describe the shape of the output signal to be output. In addition, the synthesizer has a clock generator that provides a clock signal at a fixed frequency, in the example 500 MHz. The interpolator is provided with a phase increment and a phase space. The interpolator determines the signal value for each step, in this example every 2048/16=128, and passes it to the DAC. Optionally, the interpolator can also determine the signal value to be transmitted by interpolation from the stored signal value.

The main difference from the closest analogue of the claimed device is that a multicomponent signal is synthesized, in the claimed solution a single-component signal is synthesized, the signal frequency values are not stored in the device memory, but are calculated by hardware in the claimed device using mathematical formulas.

The claimed utility model is aimed at solving a technical problem associated with an increase in signal power.

The technical result of the utility model is to provide the ability to control two-coordinate acousto-optic deflectors in a wide range of ambient temperatures at a high speed of tuning the values of the synthesized frequencies.

Achieving the set goals is possible by means of a frequency synthesizer containing two frequency synthesis channels: A and B (first and second). Frequency synthesis channel A contains a high-speed frequency synthesis synthesizer connected to a low-pass filter, which is connected to an analog multiplier, then to a band-pass filter, then to a preamplifier and power amplifier and a switch, frequency synthesis channel B also contains a high-speed frequency synthesis synthesizer connected with a low-pass filter, which is connected to an analog multiplier, then to a band-pass filter, then to a preamplifier and a power amplifier, both frequency synthesis channels are connected to an interface calculator that receives a signal from the control bus, the interface calculator is also connected to a switch. Channel A switch allows you to connect at high speed to the second output a signal with a stable, known frequency value for calibrating a higher-level device.

The power amplifier comprises a first power amplification stage, an output power stabilization circuit, and a power amplifier output stage.

The essence of the utility model is illustrated by the drawing, in which:

Fig. 1 - scheme of the frequency synthesizer.

In figure 1, the positions indicate the following:

1 - interface-computer;

2, 3 - high-speed frequency synthesizer in the range of 30 ... 50 MHz of the first and second channels, respectively;

4, 5 - LPF (low-pass filter) of channels A and B, respectively;

6, 7 - analog multiplier of channels A and B, respectively;

8, 9 - bandpass filter 60...100 MHz channels A and B, respectively;

10, 11 - preamplifier of channels A and B, respectively;

12, 13 - power amplifier 4 ... 7 W channels A and B, respectively;

14, 15 - the first stage of amplifying the power of channels A and B, respectively;

16, 17 - scheme for stabilizing the output power in the temperature range -60 ... + 55 ° C channels A and B, respectively;

18, 19 - output stage of the power amplifier channels A and B, respectively;

20 - switch.

These drawings do not cover and, moreover, do not limit the entire scope of options for implementing this technical solution, but are only illustrative material of a particular case of its implementation.

The claimed device is a frequency synthesizer, mainly a frequency synthesizer LC-06. The signal coming from the control bus passes through the calculator interface (1) to two channels of frequency synthesis. Frequency synthesis channel A contains a high-speed frequency synthesizer (2), mainly a high-speed frequency synthesizer in the range of 30...50 MHz, connected to a low-pass filter (4). Next, the signal goes to an analog multiplier (6), and then to a bandpass filter in the frequency range 60 ... 100 MHz (8), then with a bandpass filter (8), a preamplifier (10), a power amplifier (12) and a switch (20) which has two outputs. The calculator interface (1) is also connected to the switch (20). Frequency synthesis channel B also contains a high-speed frequency synthesizer (3) connected to a low-pass filter (5), which is connected to an analog multiplier (7), then to a bandpass filter (9), with a power preamplifier (11) and a power amplifier ( 13), both frequency synthesis channels are connected to the calculator interface (1) receiving the signal from the control bus.

The power amplifier (12, 13) contains the first power amplification stage (14, 15), the output power stabilization circuit, mainly the output power stabilization circuit in the temperature range -60…+55°С (16, 17) and the amplifier output stage (18, 19).

All elements of the device are inextricably connected by soldering and placed in a single housing.

The claimed device has sufficient signal power, which makes it possible to control two-coordinate acousto-optic deflectors in a wide range of ambient temperatures.

Claims (2)

1. A frequency synthesizer containing two frequency synthesis channels, characterized in that the first frequency synthesis channel contains a high-speed frequency synthesizer connected to a low-pass filter, which is connected to an analog multiplier, then to a bandpass filter connected to a power preamplifier, which is connected to power amplifier connected to the switch, the second frequency synthesis channel also contains a high-speed frequency synthesizer connected to a low-pass filter, which is connected to an analog multiplier, then to a bandpass filter connected to a power preamplifier, which is connected to a power amplifier, both frequency synthesis channels connected to the calculator interface receiving the signal from the control bus, the calculator interface is also connected to the switch 2. The frequency synthesizer according to claim 1, characterized in that the power amplifier comprises a first power amplification stage, an output power stabilization circuit, and an amplifier output stage.

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