SU1527717A1 - Balance mixer - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to improve the matching and reduce the dependence of the conversion loss and dynamic range on the loads. The balanced mixer contains an annular bridge 1 with shoulders 2, 3, and 6, separation capacitors (K) 4 and 5, mixing diodes 8 and 7, resistors 9 and 10, blocking K 11-14, and sections 15–20 transmission lines. When the signal power and the local oscillator are applied through K 4 and 5, bridge 1 and segments 15 and 16 on diodes 7 and 8, oscillations interact on the nonlinearities of diodes 7 and 8 and the formation of intermediate and combination frequencies. In this case, the power at the intermediate frequency passes to the output without loss. The oscillation powers of the total and doubled heterodyne frequencies are allocated only in resistors 9 and 10, which prevents their passage and summation in an arbitrary phase at the inputs of the signal, local oscillator and intermediate frequency. 1 il.

Description

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The invention relates to radio engineering 1 can be used for. frequency conversion of electrical oscillations at close P {signal and local oscillator frequencies.

The aim of the invention is to improve the matching and reduce the dependence of the conversion loss and dynamic range on the load.

The drawing shows an electrical schematic diagram of the mixer.

The balayish mixer contains an annular gap 1, the length of which is equal to three second signal wavelengths, the first and second arms 2 and 3 of which include the first frequency and second coupling capacitors A and 5 and which are the signal inputs and the local oscillator, respectively, and the third shoulder 6 is intermediate frequency output, the first and second mixing diodes 7 and 8, connected in opposite directions between the ring bridge 1 and the common bus at a distance of a quarter of the signal wavelength symmetrically to the second arm 3, the first and second resistors 9 and 10 with resistance 50 Ohm, the first, second, third and quarter block capacitors 11-14, the first and second segments 15 and 16 of the line with a length equal to one eighth of the signal wavelength, the third and fourth segments 17 and 18 of the transmission with a length equal to a quarter of the length signal waves with a wave impedance of 50 ohm pj and the sixth sections 19 and 20 of the transmission line with a length equal to a quarter of the signal waves, the cathode of the first mixing diode 7 through the first resistor 9 connected in series, the third segment 17 and the first blocking capacitor 11 are connected to total w not through the first segment 15 to the ring-BONry bridge 1, between the connection point of the first segment 15 with the ring bridge 1 and the common bus, the fifth segment 19 and the second blocking capacitor 12 anode of the second mixing diode 8 are connected through the second resistor 10 connected in series , the fourth segment 18 and the fourth blocking capacitor 1A is connected to the common bus, and through the second segment 16 to the ring t-junction 1, a follower is connected between the junction point of the second segment 16 with the ring bridge 1 and the common bus

about

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5 5

but connected by the sixth segment 20 and the third blocking capacitor 13.

The balance of the mixture of spruce works as follows.

When applying the signal power and the local oscillator through the separation capacitors 4 and 5, ring bridge 1, segments 15 and 16 to the mixing diodes 7 and

8the interaction oscillates: 1J on the nonlinearities of diodes 7 and 8 and the formation of intermediate and combination frequencies o For the total and twice heterodyne frequencies, the equivalent lengths of the segments 17 and 18, shorted by blocking capacitors

11 and 14 is equal to half a wavelength, so the resistance between resistors 9 and 10 and sheath is 1 minute short. The resistance at the points of connection of the segments 15 and 16 to the anodes 7 and 8 is great due to the fact that at the junction of the segments 19 and 20 with the ring bridge

1 resistance is small, since the length of these segments, shorted by blocking capacitors, is equivalent

12 and 13 are equal to half the wavelength of the sum and difference frequency. Segments 15 and 16 have an equivalent length at these frequencies equal to a quarter of the wavelength, which provides great resistance at their connection points. to diodes 7 and 8. At the signal and heterodyne frequencies, the input resistance of segments 17–20 is large, as they are shorted by blocking capacitors 11–14, and their equivalent length is equal to a quarter of a wave, therefore the work of a balanced mixer

not violated. Shunting of intermediate frequency by segments 17 - 20 And the allocation of its power in resistors,

9 and 10 are excluded by blocking capacitors 11-14, which

At this frequency, they have a high resistance, so the power at the intermediate frequency passes to the output without loss. As a result, the total oscillation power and double heterodyne-; Noise frequencies are allocated only in resistors 9 and 10, which prevents their passage and summation in an arbitrary phase at the inputs of the signal, local oscillator and intermediate frequency, thereby improving matching and reducing the dependence of the loss of power. development, and also the dynamic range from the loadings of the balanced body.

15

Claims (1)

Invention Formula A balanced mixer containing an annular bridge, whose length is equal to three second signal wavelengths, the first and second separators of which are the signal and the local oscillator, respectively, the first and second mixing diodes, which are switched on differently, are included in the first and second arms. between the annular bridge and the total length at a quarter-wavelength of the signal is symmetrical to the second shoulder, characterized in that, in order to improve the matching and decrease the dependence of the conversion loss and dynamic range from the loads, the first and second resistors are entered into it, the value of which is chosen to be 50 Ohms first second, third, fourth blocking capacitors, first, second, third, fourth, fifth, sixth segments of the transmission line, and the lengths of the first and second the lengths of the transmission line are chosen equal to one eighth of the wavelength of the signal, and the third, fourth, fifth, sixth - four G / These waveforms of the signal, the impedances of the third and fourth segments of the transmission line are 50 Ohms, while the cathode of the first mixing diode is connected through the first resistor connected in series, the third segment of the transmission line and the first block capacitor are connected to the common bus, and the first segment of the transmission line to the ring bridge, between the connection point of the first segment of the transmission line with the ring bridge and the common bus, the fifth segment of the transmission line and the second blocking capacitor, the anode of the second with The second diode is connected to the common bus through a serially connected second resistor, the fourth segment of the transmission line and the fourth blocking capacitor are connected to the common bus and via the second segment of the transmission line to the ring bridge, the sixth segment connected in series between the connection point of the second segment of the transmission line with the ring bridge and the common bus transmission lines and a third blocking capacitor.