JPH0447702A - Frequency mixing balanced modulator - Google Patents

Abstract

PURPOSE:To obtain a stable high frequency characteristic by providing 1st and 2nd input output transformers, a diode matrix and an intermediate lead to in modulator. CONSTITUTION:A 1st input output transformer LA receiving an RF signal f1 (1st signal wave) from a primary coil L1 coated on a board PLT and a 2nd input output transformer LB receiving a local signal f2 (2nd signal wave) from a primary coil L6 coated on the board PLT are provided to the modulator. Moreover, a diode matrix DM is provided, which connects to secondary coils L2-L3, L4-L5 of the 1st and 2nd input output transformers. Furthermore, intermediate leads CW2-CW5 are provided, which connect to the secondary coils L2-L3, L4-L5 of the 1st and 2nd input output transformers LA, LB giving and receiving an intermediate frequency f3 (3rd signal wave) via the diode matrix DM in response to the input output of the local signal f2. Thus, the modulator is suitable for mass-production and the effect of all the leads due to inductance is eliminated and a stable high frequency characteristic is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a frequency mixed balanced modulator, which is particularly suitable for mass production, eliminates the influence of inductance due to leads, and provides stable high frequency characteristics. Regarding modulators.

[Prior art and problems to be solved by the invention] Conventionally, frequency mixing balanced modulators used in car telephones etc.
For example, the width, depth, and height are 5.2X3X2 as shown in the figure.
Ferrite core F C1, Fe2 with 1 or 2 mm through hole CH, CH21: 0.15 mm
A circuit is constructed by using input/output coils LA and LB formed by manually winding lead wires W+ Ws and W4W6 of diameter, and combining them with a diode matrix DM. These three windings are used as a primary coil 7, L6. Secondary coils L2, L3, L4, L6 are used as silver electrodes P5, P6, P7, P8 of the diode matrix DM as intermediate leads, silver electrodes P3, If you connect the secondary coils L2, L3, L4, and L6 that correspond to P4, P9, and PIO,
A diagonal frequency mixing balanced modulator is constructed.

These coils are connected to the RF side where the RF signal f is input from the silver electrodes P1 and P2, the local side where the local signal f2 is input/output, and the IF side from the silver electrodes Pa, P< and P9, PIO.
It is formed by three windings on the IF side where the signal f8 is input/output, so these three windings cross at the through holes CH, CIJ2,
Great care must be taken to prevent the skins of the lead wires W+ Ws and w4-w6 from peeling off.

Further, winding of the lead wires W+ Wa and W4-W6 not only cannot be mechanized, but also has the disadvantage that a large number of man-hours are required for completion inspection such as appearance and characteristic inspection.

[Object of the Invention] The present invention was made in view of the above-mentioned difficulties, and an object of the present invention is to provide a frequency mixing balanced modulator that is suitable for mass production, eliminates the influence of inductance due to leads, and provides stable high frequency characteristics. shall be.

[Means for Solving the Problems] In order to achieve the objects mentioned above, the frequency mixing balanced modulator of the present invention is provided with a frequency mixing balanced modulator which is formed on a substrate and which receives a first signal wave from the primary side. a second quadrangle formed on the substrate and into which a second signal wave is input and output from the primary side;
an input/output transformer, a diode matrix connected to the secondary side of each of the first and second input/output lances, and a diode matrix connected to the secondary side of each of the first and second input/output lances; and an intermediate lead provided on the secondary side of the first and second input/output transformers from which a third signal wave is output and input.

[Embodiments] Hereinafter, preferred embodiments of the frequency mixing balanced modulator according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the frequency mixing balanced modulator according to the present invention is formed on a PLT on a substrate, and receives RF signals from a primary coil L.
A first input/output transformer L A receives the signal f+ (first signal wave), and a local signal f2 (second signal wave) is input from the primary coil L6 formed on the substrate 2 PLT. ,
The second input/output l/lance LB to be output, and the first and second
The respective secondary coils L2L3 of the input and output transformers,
L4 L.

The diode matrix DM is connected to the diode matrix DM, and the diode matrix D is connected to the
Secondary side L of the first and second input/output transformers LA and LB into which intermediate frequency fa (third signal wave) is output and input via M
Intermediate leads CW2, CW3 provided on 2L3, L4L5,
It is equipped with CW4 and CW5.

1 of each of the 1st and 2nd crowd LA and LB
Secondary coil L+, La, secondary coil L2L 3, L
4-L, is silver electrode P, and P2, P□1 and PI3, p3
and l) 5, P6 and P4, P9 and)) 7, P8 and P,. The silver electrodes P5, P6, P7, and P8 of the diode matrix I/Rix DM are connected to the external circuit by the intermediate electrode C.
Silver electrodes P3, P4 and P9 to which W2, CW3, CW4 and CW5 are connected, secondary coil I7 corresponding to PIO
□-L, , L4-L, are connected.

This substrate PLT is made of ceramic with a thickness of 0.635 mm, for example. The conductor parts of the primary coils L1, L6, secondary coils L2-L3, L4-L, and silver electrodes P, ~P1□ of the input/output transformer LAXLB are made of metal such as gold, silver, silver-palladium, copper, etc. Substrate 1) A circuit pattern is formed on LT-1'- by forming a thin film by sputtering or vapor deposition, or by forming a multilayer thick film by screen printing. To perform multilayering using thin films, the secondary coil L3
The upper layer is the lower layer LY, L2 and L4 are the middle layer LY2, the primary coils L and L6 are the second layer LY3, and as shown in FIG. The layers are multilayered in the order of middle layer, upper layer LY, to LY3.

In this multi-layer structure, an insulating film FL such as silicon oxide or glass is used to insulate the lower, middle, and two-part layers from each other.
, , FL2, FL are formed and interposed.

For the ferrite cores of the input/output transformers LA and LB, ferrite powder having an AC initial magnetic permeability of 1500 was mixed with a glass powder amount of 10% by weight so as to prevent insufficient printability and firing into a thick film.

In addition, the diode matrix DM formed of nonlinear elements includes diodes D1, D2,
Four leads in which the cathodes of D3 and D4 and the anodes of D4, D8, D7, and D2 are internally connected are connected to silver electrodes P7, P8, P5, and P6, respectively, by wire bonding, thermocompression bonding, or the like. The overall finished external dimensions are, for example, 4.99 x 4.5 x 30 mm.

FIG. 4 shows a thick film deposition pattern process PP, -PpH for obtaining a diagonal frequency mixing balanced modulator.

[Operation of the invention] In the frequency mixing balanced modulator configured in this way,
R of 700 to 1100 MHz from the silver electrodes P and P2 of the primary coil L of the input/output transformer LA shown in FIG.
Input the F-fold signal, and then input/output transformer LB 1
By inputting the silver electrode pH of the coil L6 of the secondary coil and the local signal f2 from PI3, the secondary coils L2, L3,
L4, L5 intermediate leads CW2, CW3, CW4, CW
5 is connected to silver electrodes P3, P4 and Po, 50 to 1 corresponding to the double-balanced modulated local signal f2 from PIO.
An intermediate frequency f3 of 50 MHz can be obtained. It operates with a leakage of local signal f2 of -40 dB to -60 dB, maximum input of 200 mW, maximum operating voltage IV, current of 50 mA, and impedance of each port of 50 Ω. Further, according to thin film technology, it is possible to set the RF multiplied signal to 100 to 3000 MHz, and to set the frequency of the corresponding local signal f2 to about 2000 MHz higher than that of thick film deposition.

According to this frequency mixed balanced modulator, the input/output transformer is formed by film formation, so deviations in characteristics for weak high frequencies can be kept within the range of design conditions, and it can be used as a surface mount component without leads. This makes it possible to directly mount it on the high frequency transmission line, which removes the influence of inductance caused by the diode matrix etc. and all leads, resulting in stable high frequency characteristics and making it possible to mount it directly on the high frequency transmission line such as a filter. can be formed on the same substrate, which further improves the overall high frequency characteristics.

Furthermore, since the input/output transformer is formed by film formation, it not only contributes to the space factor but also contributes to improving productivity.

In the embodiment described above, input/output transformers LA, LB to R
I input the F signal f□ and the local signal f2, but the intermediate coil between the secondary coils L2, L8, L4, and L5 is CW2, C.
Silver type poles P8, P4 to which W, l, CW4, CW6 are connected
Input the carrier wave from P9 and Plo, and connect the silver electrodes Pjj and P
A modulated wave subjected to double balance modulation may be output from I3.

Note that the composition and state of the substrate, insulating member, conductor, etc. are not limited to the diagonal embodiment.

[Effects of the Invention] The frequency mixing balanced modulator according to the present invention includes a first input/output transformer formed on a substrate and into which a first signal wave is input from the primary side, and a first input/output transformer formed on a substrate and inputted with a first signal wave from the primary side. a second input/output transformer into which a second signal wave is input and output from the next side;
A third signal wave is outputted via the diode matrix according to the input and output of the second signal wave, and the diode matrix connected to the secondary side of each of the input and output transformers.
Since it is composed of intermediate leads provided on the secondary side of the first and second input/output transformers, it is suitable for mass production, and the influence of inductance due to all leads is removed, resulting in stable high frequency characteristics. There are benefits to be gained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the frequency mixing balanced modulator according to the present invention, FIG. 2 is a circuit diagram related to FIG. 1, and FIG. 3 is a multilayered portion of the frequency mixing balanced modulator shown in FIG. 1. Fig. 4 is a block diagram showing a pattern process using a thick film.
FIG. 5 is a block diagram of a conventional frequency mixing balanced modulator. PLT... Board I, A... First input/output transformer L,...
...Primary coil L2 L3...Secondary coil LB...Second input/output transformer L6...
・Primary coil L4L5・・・Secondary coil

Claims (1)

[Claims] a first input/output transformer formed on the substrate and into which a first signal wave is input from the primary side; and a first input/output transformer formed on the substrate and into which a second signal wave is input and output from the primary side. a second input/output transformer, a diode matrix connected to the secondary side of each of the first and second input/output transformers, and a diode matrix connected to the secondary side of each of the first and second input/output transformers; the first, into which a third signal wave is output and input;
A frequency mixing balanced modulator comprising: an intermediate lead provided on the secondary side of a second input/output transformer.