RU2390929C1 - Digital-to-analogue converter - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: digital-to-analogue converter (DAC) can be used to convert codes into analogue signals. The DAC has a register, a block of pulsed amplifiers, a photodetector and an operational amplifier. The DAC includes a piezoelectric transducer, having an opaque case on the first face of which there is a white radiation micro-light-emitting diode with a microlens on the radiating side. Inside the case there are from the first to the eighth neutral micro-optical filters arranged one after the other on the optical axis of the microlens, each having the corresponding coefficient of absorption, from the first to the eighth micro-piezoelectric elements, the first ends of which are rigidly attached to the case and the second free ends are connected to their neutral micro-optical filters accordingly. Inputs of the micro-piezoelectric elements are the control inputs of the piezoelectric transducer and are connected to corresponding outputs of the block of pulsed amplifiers. In the second face of the case there a photodetector with the input window on the radiation side, and its optical axis lies on the optical axis of the microlens.

EFFECT: lower power consumption of the DAC and its miniaturisation.

1 dwg

Description

The invention relates to digital-to-analog converters (DACs), can be used to convert codes to analog signals.

The prototype adopted the DAC [1], which contains a series-connected register, a block of pulse amplifiers, a matrix of nine LEDs with filters of the corresponding density, a lens, a photodetector, and an operational amplifier that performs the conversion of eight-digit codes into analog signals. The radiation weight of each LED is set by the corresponding densities of the neutral filters. The lens collects the emission of the LEDs after the neutral filters in the input window of the photodetector, the signal from which goes to the operational amplifier, from the output of which the analog signal follows its intended purpose.

The total radiation flux is directly proportional to the code value.

The disadvantage of the prototype: the matrix of LEDs accounts for the main energy consumption, it occupies the bulk of the DAC, preventing the miniaturization of the digital-to-analog converter.

The purpose of the invention is to reduce the power consumption of the DAC and miniaturize its performance. Technical results include a reduction in the energy consumption of the DAC and its microtechnological performance, achieved by eliminating the LED matrix and introducing a piezoelectric transducer into the DAC.

The essence of the invention is that in a DAC containing a register, a block of pulse amplifiers, a photodetector and an operational amplifier, a piezoelectric transducer (PP) is introduced.

The functional diagram of the DAC in the drawing includes series-connected register 1, block 2 of pulse amplifiers, piezoelectric transducer 3 (PP), photodetector 4 and operational amplifier 5. Register 1 is eight-bit, eight in block 2 of pulse amplifiers (by the number of bits in the register). PP 3 has an opaque housing 6 (drawing), in which there is a white LED 7 with a microlens 8 on the emitting side, from the first to the eighth neutral microfilter 9 _1-8 , each of which has a corresponding absorption coefficient and arranged sequentially one after another and along the optical axis of the microlens 8 and includes the first through eighth mikropezoelementy 10 _1-8, the first ends are rigidly fixed in the housing 6, the second free ends of them are jointed with its neutral mikrosvetofilt s 9 _1-8. A photodetector 4 is located in the outlet opening of housing 6 with an input window toward the micro-LED 7 emission side, the optical axis of the photodetector is located along the optical axis of the microlens 8. Neutral micro-light filters 9 _1-8 each with an area of ≈100 micrometers have the absorption coefficients of the incoming radiation, respectively, of their discharge weight, given in the table . The walls of the housing 6 have a light-absorbing coating. The radiation of the micro-LED 7 is focused by a microlens 8 and enters the micro-filters 9 _1-8 . The principle of operation of PP 3 is based on the fact that each successively located microfilter 9 absorbs a portion of the radiation according to its absorption coefficient, shown in the table. The values of the absorption coefficients comply with the principle of binary code.

Table Code bit number Code discharge weight Absorption coefficient 1 senior 2 ⁷ (128)

2 2 ⁶ (64)

3 2 ⁵ (32)

four 2 ⁴ (16)

5 2 ³ (8)

6 2 ² (4)

7 2 ¹ (2)

8 2 ⁰ (1)

In the absence of control signals at the inputs of the micropiezoelectric elements 10 _{1-8, the} microfilter 9 _1-8 block the radiation flux from the micro-LED 7 to a level lower than the sensitivity limit of the photodetector 4. When the micropiezoelectric element 10 receives a control pulse from block 2, the amplitude of which corresponds to the operating voltage of the micropiezoelectric element 10, free its end makes a bend and turns the microfilter 9 through 90 °, the radiation flux passes without attenuation further. As micro-piezoelectric elements 10, tubular piezoelectric elements working in bending are used, the dignity of which is strength and reliability [3, p.27]. When bending, the free end transfers its microfilter 9 to a position that does not impede the passage of radiation to the next microfilter.

DAC operation.

In the absence of control signals from block 2, the microfilter filters 9 are in the initial state and all block the radiation flux from the micro-LED 7. With the arrival of the code in register 1, the signals are sent to the corresponding pulse amplifiers of block 2, where they are amplified to the corresponding value and fed to the inputs of the corresponding micropiezoelectric elements 10. The free ends of the micropiezoelectric elements, to which the control signals were received, bend and rotate their neutral microfilter filters through 90 °, freeing the free passage of the flux section of (drawing).

The drawing shows the moment of conversion of the code 10110110 into an analog signal. The radiation flux received by the photodetector 4 is directly proportional to the value of the code entering the register 1. The inventive DAC has a lower power consumption than the prototype (one LED instead of nine) and is performed by a microelectronic product using nanotechnology.

Information sources

1. RF patent No. 2275740 C1, cl. H03M 1/66, bull. No. 12 dated 04/27/06, prototype.

2. Kolesnichenko OV, Shishigin I.V. PC hardware, 5th ed., St. Petersburg, 2004, p. 531.

3. A.F. Plonsky, V.I. Thearo. Piezoelectronics. M., 1979, p. 26, 27.

4. I.V. Fridlyand, V.G. Soshnikov. Automatic control systems in video recording devices. M, 1988, p.118-120.

Claims (1)

A digital-to-analog converter (DAC) containing a series-connected register, the inputs of which are inputs of the DAC, and a block of pulse amplifiers, a series-connected photodetector and an operational amplifier, the output of which is the output of the DAC, characterized in that a piezoelectric transducer containing an opaque case is inserted into it the first end of which is a white LED with a microlens on the emitting side, inside the case are arranged sequentially one after another and along the optical on the first axis of the microlenses, from the first to the eighth neutral microfilter filters each with a corresponding absorption coefficient, from the first to the eighth micropiezoelectric elements, the first ends of which are rigidly fixed in the housing, their second free ends are appropriately connected to their neutral microfilter filters, the inputs of the micropiezoelectric elements are the control inputs of the piezoelectric transducer and are connected to the corresponding outputs of the block of pulse amplifiers, in the second end of the housing there is a photodetector input window ohm towards the radiation, and its optical axis is located along the optical axis of the microlens.