JPS5821863B2 - receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiving device that is capable of preferentially selecting the one with a stronger received electric field from among two receiving outputs, and allows easy priority selection of the receiving output. It is.

For example, there is a conventional system as shown in FIG. 1 which selects the stronger received electric field from two received outputs.

In Fig. 1, 51.71 is an antenna, 52.72 is a receiver, 53, 63.73 is a comparator, 54.74 is a reference source, 55.75 is a Nant gate, 64 is an inverter, 65
is a flip-flop, and 56° and 76 are switches.

Here, the receiving section of 52.72 includes an RF amplifier 81, mixer 82, local oscillation section 83, filters 84,
6, amplifier 85, 87, 91, diode 90, 92,
93, detector 88, filter 8 for extracting the squelch signal
9, and in response to the antenna input applied to the terminal 98, the output terminals 94 to 97 output the reception detection signal ■F1 (I"1-t, IFl-2 in FIG. 1) and the reception electric field signal ■F
2 (IF2-1.IF2-2 in FIG. 1), and the detected signal RX (RX in FIG. 1).

RX2), squelch signal RXSQ Fig. 1 RX1 SQ.

RX2 SQ can now be taken out.

Therefore, in the comparators 53 and 73, the reference sources 54 and 74 and the IF,
1 ■F2-2, IF1~1 and ■F1 in comparator 63
-2, one of the Nant gates 55, 75 is opened by the output of the comparators 53, 63.degree.

In this case, the flip-flop 65 is not set immediately even if there is an output from the gate 55.
The on/off control of the switch 56.76 is performed from the output of Q and RX2 SQ.

In Figure 3, X and Y are ideal IF2 (■F2-1
y lF2-2), IFt(IFt-t*I
Ft-2).

In this configuration, the comparator 63 outputs If I II if IFl-1>IF, 2, and II OII if vice versa, IF with respect to the reference line a in FIG.

If IFl is on the right side and IFl is on the left side, a comparison can be made clearly.

However, when the sensitivity of the comparator 63 was improved, there was a difference between 1F1-1 and ■Fh2 due to ripples in the IF characteristics or fluctuations in the electric field, as shown in the enlarged view of part b, even though they were both on the right side of line a. There is a drawback that sometimes a switching output occurs when the electric field changes within the range indicated by the circle.

Also, F1-1 and IF, 2 must be made to be the same, making manufacturing difficult.

The present invention eliminates such drawbacks, and will be explained below with reference to an embodiment in FIG. 4.
3,73,54,74,55°75.56,76.64
, 65 are the same as those in FIG. 1, and their explanation will be omitted. The IF and 2 outputs can be taken out as shown in Figure 5.

Therefore, this is different from the case in FIG. 3, but this can be freely selected depending on how the diodes 92 and 93 in FIG. 2 are connected (used).

In Figure 4, 20 is the setting variable resistor 2 for input comparison.
0.21 is a comparator, 22 is a reference source, and 23 is a time setting resistor for providing hysteresis to the comparator 21.

This hysteresis forms a dead zone that prevents the generation of a switching signal in response to the above-mentioned fluctuations.

Next, the operation of this configuration will be briefly explained.

First, I Fl-1y I F)-2 are obtained in the reverse form as shown in Fig. 5, and when they are located on the right side of the reference line D, they can be set to Ov by the setting variable resistor 20. can.

Therefore, 1F1-1. It is no longer necessary to pay attention to approximating IF1 at a considerably high level, and by making the difference between the two 0, it is possible to match the equality constraint.

Furthermore, by using a highly accurate resistor, the voltage difference between the two can be easily adjusted to an accuracy of 0.001V.

On the other hand, if a difference occurs between ■F1-1 and ■F1-2, the comparator 21 has an input.

(Figure 6 specifically explains the configuration of 20 to 23 in Figure 4. By varying VB2, which is 23, the comparator 2
The operational amplifier forming the circuit 1 can operate as shown in FIG.

By varying the amount of feedback of the output, the hold voltage can be adjusted to the 8th
(It can be changed as shown in the figure).

Note that when IFl-1 and ■F1-2 are on the right side of D shown in FIG.
Set to .

By doing this, if the input potential of the comparator 21 is 0, II I II is output, and if it is -, II OII is output, which is the same as the conventional Nant gate 55.
, 75 are input.

Note that if a ripple occurs between F,1 and IFl-2 as shown in Figure 3, it can be dealt with by varying the feedback amount of vF, and if a highly accurate VB2 is used, it can be dealt with. Stability is measured.

Furthermore, by using a comparator 21 with a gain of 1,000,000 times or more, the Schmitt speed can be increased and holding can be performed satisfactorily.

Although the embodiments have been described above, the present apparatus can easily form a high-precision apparatus compared to conventional apparatuses, and is extremely advantageous in practice.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional receiving device, Fig. 2 is a specific system diagram of a part thereof, Fig. 3 is an intermediate frequency characteristic diagram, and Fig. 4 is a system diagram of a receiving device in an embodiment of the present invention. Figure 5 is its intermediate frequency characteristic diagram, Figure 6 is a partial electrical wiring diagram,
The seventh tooth, FIG. 8, is its operating characteristic diagram. 20... Setting variable resistor, 21. 53. 73
...Comparator, 52, 72...Receiving section,
55,75... Nantes Gate, 56,76...
...Switch, 65...Flip-flop, 64...Inverter, 54°74.22...
...Reference source.

Claims (1)

[Claims] Reception order determining signals are taken out in reverse form from the 12 receiving sections and applied to both ends of a resistor for balance adjustment, and the signals taken out from the sliders of the resistors are fed back into the feedback form. one input terminal is supplied to the other input terminal of an operational amplifier whose potential is set to a predetermined potential, and the output signal of the operational amplifier and the received electric field signal exceeding the predetermined received electric field in the two receiving sections are connected. A receiving device characterized in that a detection output selection signal is created by logical product. 2. The receiving device according to claim 1, wherein the resistor is configured by a circuit in which a fixed resistor, a variable resistor, and a fixed resistor are connected in series in this order, thereby making it possible to perform fine adjustment. 3 Claim 1 in which the operational amplifier has a diode on its output side to limit the output voltage range.
Receiving device described in section. When the reception levels of the 42 receivers are made the same, a potential equal to the signal voltage appearing on the slider of the balance adjustment resistor is set to one input terminal of the operational amplifier, and the resistor and the operational amplifier are matched. The receiving device according to claim 1, wherein: 5. A patent that adjusts the amount of feedback of the operational amplifier to provide the operational amplifier with a dead zone corresponding to the fluctuation of the reception priority determining signal at saturation, so that the fluctuation does not cause a change in the output signal of the operational amplifier. A receiving device according to claim 1.