SU1363268A1 - Function amplifier - Google Patents

Abstract

The invention relates to automation, computing and radio engineering. The aim of the invention is to expand the scope by controlling the amplitude response and improving accuracy. The functional amplifier contains amplification stages 1 ,, .. ,, 1, threshold elements 2 о, keys 31, pr 5d,., 5, decoder 6, read-only memory 7, pulse generator 8, address register 9, counter 10 commands and distributor 11 clock pulses. The principle of operation of the amplifier is based on the choice, depending on the size of the input voltage, of the corresponding channel forming the output signal, the transmission coefficient for which is set by the output code of the memory device, which ensures high accuracy of the amplitude response of the amplifier, as well as changes use of a functional amplifier. 3 il. S (L с: оо 05 сою 05 00

Description

The invention relates to automation, computing, radio engineering and can be used to create amplifiers that have an arbitrary, predetermined amplitude characteristic and ensure rapid change in its operation.

The aim of the invention is to expand the field of application by controlling the amplitude response and improving the accuracy.

Fig, 1 shows a block diagram of a functional amplifier; FIG. 2 shows possible amplitude characteristics of the amplifier; FIG. 3 shows the real form of the amplitude response, which is resistible in the functional amplifier under consideration.

The functional amplifier (fig, 1) contains n stages 1, -1 gain (n + 1) threshold elements (n +) keys, 3 o - 3, (n + l) registers 4o - 4 1 storage coefficients, (n + l ) controlled dividers 5 - 5, voltages, decoder 6, read-only memory 7, pulse generator 8, address register 9, command counter 10 and clock distributor 11.

Functional amplifier works as follows.

The input signal is amplified in n stages of 1–1 amplification. To obtain the minimum signal delay in the amplification stages, the latter must have a fairly wide bandwidth. With small signals at the amplifier input, video signals at the output of each stage have a level that gradually decreases from the output of the amplifier to its input. The triggering thresholds of the elements Z - 2 are of the same magnitude. As the input signal grows, successive triggering of the threshold elements is observed and, accordingly, the appearance of their output 1, starting with the last 2, while the outputs of the remaining elements have a level of 0. Thus, the amplitude of the video signal is converted into a digital position code, which goes to the input of the decoder 6. The decoder generates a control signal received at the control input of one of the keys 3 (,. corresponding to the last of the triggered threshold

elements 2 (, - 2 ". The signal through the public key 3 goes to the controlled divider 5 (and then to the amplifier output. The amount of signal attenuation is determined by the code recorded in registers 4,

When amplifying high-speed or pulse signals, it is necessary to compensate for the delay occurring in the amplification stages 1., - 1, 2 элемент - 2 J keys, 3 keys, decoder 6 and controllable dividers 5c, - 5π (schemes of additional signal delays, -admitted to the controlled dividers, fig. 1, not shown, Formation of the required amplitude characteristic is performed by commands received from 1M from external devices. The amplitude characteristic setting cycle consists of two clock cycles. th clock.

When the power is turned on, a single reset pulse is generated in the power source, arriving at registers 4-4, address register 9, command counter 10 and setting them to O (in FIG. 1, a reset circuit is not shown). With a delay of one repetition period 8 pulse generator and 11 clock pulse distributor work, each first clock pulse of the cycle is sent to address register 9, and the second pulse to registers 4-4, the command address code corresponding to the type of amplitude response comes from external devices to a 1U com counter ND, where is stored until the next command. The next command can completely change the code of command counter 10 or increase its contents by 1 in the lower order. With the arrival of the first clock pulse, the command is written to the address register 9, where the information is stored until the beginning of the next operation cycle.

Permanent memory ROM 7 converts the address of the search word into its code. The output of the ROM consists of (n + 1) 1-bit buses, in which the attenuation code is written, corresponding to the 1st selected amplitude characteristic. The output word consists of n + 1) syllables. Every syllable

consists of 1 bits and is associated with the corresponding register 4.

With the arrival of the second clock pulse, the syllables of the word from the ROM are written to the corresponding registers 4. The attenuation code recorded in the registers is controlled by dividers

0

life corresponding to the selected amplitude response. With this, the amplitude response formation ends. In the case where the command counter 10 is in the O position, i.e. commands from external devices are not received, the word corresponding to the linear amplitude characteristic is read from the ROM.

In the case of using a functional amplifier as an adaptive threshold device (FIG. 26), the degree of suppression of the initial part of the characteristic depends on the level of interference. When tracking a mobile object in radar stations, the range information is converted into the corresponding control signal entering the counter 10. At the same time. a type 2c characteristic is formed which shifts along the axis of the input signals depending on the distance to the object.

Thus, the amplitude characteristic of the proposed amplifier is a step function of the input signal (FIG. 3. The magnitude of the step is strictly constant for this amplifier and the smaller the number of stages. This ensures the required accuracy of the amplitude response .

Claims (1)

Invention Formula Functionally, an amplifier containing a group of series-connected amplification stages, the input of the first of which is the signal input of the functional amplifier, (n + 1) keys, (where n is the number of stages amplification), connected by control inputs to the outputs of the decoder, connected by inputs to outputs (n + 1) of threshold elements, the first of which is connected to the signal 0 to the input of the functional amplifier, and the input of each of the subsequent threshold elements is connected to the output of the corresponding amplification stage, characterized in that 5 with an extension of the application area by controlling the amplitude response and increasing accuracy, (n + 1) controlled voltage dividers, (n + 1) coefficient storage registers, read-only memory, address register, command counter, clock distributor and pulse generator, the output of which is connected 5 to the input of the clock distributor connected with the first output to the control input of the address register, and the second output to the control input of the register of the registers storing connected with information inputs to the corresponding outputs of the permanent storage device connected with the address input with the output of the address register; which input is connected to the output of the program counter, counting the setup inputs of which are the amplitude response control inputs of the functional amplifier, wherein the output of each coefficient storage registers are connected to the control input of the corresponding controlled voltage divider connected by output to g output functional amplifier, and the signal input to the output of the corresponding key connected by a signal input to the input of the corresponding threshold element. five and & FIG. 2 but rig.Z Compiled by S.Kazinov Editor E.Kopcha Tehred A.Kravchuk Proofreader A.Obruchar Order 6365/43 Circulation 671 Subscription VNSHSHI USSR State Committee for inventions and discoveries 113035, Moscow, P-5, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4