SU1437964A1 - Phase detector - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to expand. the amplitude range of the input signals and reducing the size. The detector contains a y-voltage converter 1 voltage – current, an interrupter, and an averaging filter, polished on the first and second pairs 2 and 3 of complementary current reflectors containing current reflectors 4, 5, 6, 7 B. This phase detector has a wider amplitude range, which is due to the configuration of the proposed scheme. As a current-emitting element 8 m. An ordinary resistor is used, as well as a nonlinear element, for example, current stabilization of a two-port device on a field-effect transistor. Input impedance device m. much povpieno, odds the transmission is increased, and the bias voltage of the constant level at the inputs and the bias current at the output are reduced if we use in the proposed detector complementary high-precision current reflectors, such as cascade. 1 il. I cl

Description

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This invention relates to radio engineering and may be used in radio receiving devices.

The purpose of the invention is to expand the amplitude range of the input signals and reduce the size.

The drawing shows an electrical functional diagram of the proposed phase detector.

The phase detector contains a controlled converter 1 voltage - current, the first and second pairs 2 and 3 of complementary current reflectors, containing current reflectors 4-7, and the current-supply element 8.

Phase detector works as follows.

The heat flux that creates each transistor-heater of the first pair 2 of the complementary reflector current in the surrounding space is proportional to the electric power dissipated on it. The electrical power is equal to the product of the current of the transistor heater and the collector-ettter voltage. The output signal of the phase detector (current or voltage) is determined by the imbalance of the arms of current reflectors 6 and 7 of the second pair of 3 complementary current reflectors, which is caused by different temperatures of the semiconductor crystal at the points where the transistors-heat sinks are located, see more than current reflectors 6. and 7. The difference in temperature at different points of the semiconductor crystal is due to the presence of heat fluxes in it, which are created by the current-reflector transistor heaters 5 and 6 of the first pair of 2 sets entarnyh current reflectors. The current of the transistor heaters is proportional to the input voltage of the controlled voltage converter 1 — the current, and their collector voltages are linearly related to the other input voltage of the phase detector, therefore the tag currents generated by the transistor heaters are proportional to the product of the input phase signals the detector.

To obtain a minimum constant component at the output of the phase

detector in the absence of input signals, the phase detector circuit should have complete symmetry at zero input signals, -as electric,

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and heat. This is achieved by the symmetrical arrangement of current reflectors 6 and 7 with respect to the regime heat fluxes (i.e., the fluxes that occur at zero input signals). If the mean value of the input signals of the phase detector is different from zero, then the heat fluxes generated by the transistor – heaters of the current reflectors 4 and 5 are different. In this case, the above symmetry is inevitably broken, which results in the appearance of a signal at the output of the phase detector. This signal is proportional to the average-iy value of the input signal, since The rapid pulsations of the power of the transistor-heaters of current reflectors 4 and 5 do not affect the output signal of the phase detector due to the inertia of the heat transfer process. Thus, the phase detector with respect to the output signal performs the operation of averaging the product of the input signals. At the same time, this phase detector has a wider amplitude range, which is determined by the configuration of the proposed phase detector circuit.

As a current proof element 8, a conventional resistor can be used, and a nonlinear element, for example, a current-stabilizing two-pole device on a field-effect transistor, can also be used.

The input impedance of the phase detector can be significantly increased, the transfer coefficient increased, and the voltage at a constant level at the inputs and the bias current at the output are reduced if the complementary current reflectors of increased accuracy, such as cascade, are used in the proposed phase detector.

Claims (1)

Claims. A phase detector containing an interleaver and averaging filter, which is characterized by the fact that, in order to expand the amplitude range of the input signals and reduce its size, a controlled voltage converter is introduced — a current and a current-generating element, and a multiplier and average ushly filter are made on the first and second pair of complementary reflections 31347964 the current taps, the inputs of the first pair are connected through the tokozad: o1cion element, The current output reflector connectors are combined and are output controlled by a phase detector transducer and the voltage is the current, the control input transistors of the complementary reflectors, which is the first input of the phase-currents of the currents, are made in one half-detector, and the outputs of the first pair of conductor chip and the output Comppector current reflectors The OB transistors of the first pair are complementary red and are the second input of phase current reflectors and transistors. of the second detector, the inputs of the second pair of the second sixth pendant pair are connected complementary current reflectors soy-thermal connection.