SU363200A1 - CODE ANALOG CONVERTER - Google Patents

Description

one

The invention relates to the field of automation and computing.

A code-to-analog converter is known, containing a register on triggers, connected through a decoder to key circuits and a matrix with a binary division law, a source of reference voltage.

To improve accuracy, the proposed device contains an additional Ue reference voltage source with a switch and a prohibit element, the reference voltage source and an additional reference voltage source connected to the first and second inputs of the switch, respectively, whose output is connected to the matrix power supply bus. and the control input of the switch is connected to the output of the lower-order trigger register. The modulating input of the converter through the prohibition element is connected to the control input of the decoder.

The drawing shows a block diagram of the proposed device.

The device contains a decoder 1, key circuits 2, register 3, static trigger 4 low-order bits, switch 5 reference voltages (currents), prohibition element 6, reference voltage source 7

 (current / e), an additional source of 8 reference voltage (current).

Let the code 0101 be received at the inputs of register 3 and trigger 4. The first three most significant bits of the code (010) controlling the operation of the decoder / are fed to the corresponding high bits of the register's static triggers 5. The output signals of the register go to the decoder.

Consider the formation of a reference voltage for example code 0101.

The unit of the low-order bit, which came code sequence 0101, arrives at the static trigger 4 low-order register, which controls the switch 5 of the reference voltages (currents).

Since there is a low-order unit in this code combination, a signal from the static trigger 4 low-order arrives at the switch 5 of the reference voltages (currents), which in this case connects the reference voltage (current) to the key circuit 2 incoming from an additional source 8 of reference voltage (current) UE (or current / e U 2).

In the absence of a unit in the lower-order discharge, the non-switch 5 reference voltages (currents) connects the reference voltage (current) from the source 5 of the UE reference voltage (current / e) to the power supply bus of the key circuit 2.

If there is a unit in the lowest discharge, the switch 5 reference voltages (currents) connects a voltage (current) equal to

eK2 (/ eK1).

When using a converter for amplitude modulation in the case of setting the envelope as a binary code, the carrier pulses are fed to the input of prohibiting element 6, and the binary code to the inputs of scheme 2, if the decoding law is linear, or to the inputs of register 3 and trigger 4, if the decoding law, exponential.

In the presence of pulses arriving at the prohibition element 6, the latter signal prohibits the control pulses arriving at the key circuit 2, arriving from the decryptor /.

In the absence of a pulse on element 6, the amplitude value of the output voltage of the device corresponds to the incoming code combination.

For the given example with a code combination of the type 010.1, the amplitude of the pulsed

the signal at the output of the converter code-analogue corresponds to the value | / 2 V t

Subject invention

Converter code-analogue containing

a trigger register associated with a decoder with key schemes and a matrix with a binary division law, the source of the reference voltage, characterized in that, in order to improve accuracy, it contains

an additional source of reference voltage with a switch and the element "prohibition, the source of reference voltage and an additional source of reference voltage are connected respectively

the first and second inputs of the switch, the output of which is connected to the matrix power bus with a binary division law, and the control input of the switch are connected to the output of the low-order trigger, modulating the input of the converter through the prohibition element is connected to the control input of the decoder.