JPH0514059A - Shf receiver - Google Patents

Abstract

PURPOSE:To attain no adjustment of the oscillating frequency with simple configuration that a mixer circuit and a local oscillation circuit are formed on a same board and they are integrated. CONSTITUTION:A mixer circuit and a local oscillator circuit being components of the SHF receiver receiving and amplifying a 12GHz band signal from a satellite and down-converting the signal into a 1GHz band signal are formed on one and same alumina ceramic board 21 and the mixer circuit and the local oscillator circuit are integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to 12 GHz from a satellite.
The present invention relates to an SHF receiver that receives and amplifies a band signal and down-converts it into a 1 GHz band signal.

[0002]

2. Description of the Related Art Generally, as this kind of SHF receiver,
An RF amplifier circuit, a mixer circuit, a local oscillating circuit, and the like are provided. These circuits are provided on different alumina ceramic substrates, and a module in which each of them is packaged in a metal case or the like is proposed.

However, modules such as an RF amplifier circuit and a mixer circuit have problems in performance, cost and the like, and at present, only the local oscillation circuit module as shown in FIG. 2 is in widespread use.

The local oscillator circuit module shown in FIG. 2 will be described below with reference to the drawings.

In FIG. 2, FIG. 2a is a local oscillation circuit formed on a substrate, and FIG. 2b is an external view showing a state where the substrate is housed in a metal case.

In FIG. 2a, 1 is a dielectric resonator, 2 is a GaAs-FE having a gate, a source, a drain, etc.
T is a terminating resistor, 4 is a bias resistor for the GaAs-FET, 5 is an inter-digital pattern for cutting a direct current component, 13 is a power supply terminal, 17 is an output terminal of a local oscillation circuit, 16 Is an impedance pad provided so as not to cause a change in the oscillation frequency and an oscillation stop due to the influence of the impedance of the input terminal of the local oscillation signal of the mixer circuit, and these are formed on an alumina ceramic substrate. Then, this alumina ceramic substrate is housed in a metal case to complete the module shown in FIG. 2b. In FIG. 2b, 14 is a screw for adjusting the oscillation frequency, which is arranged above the dielectric resonator 1, and 15 is a screw for mounting the local oscillation circuit module.

[0007]

However, in the above configuration, since the impedance pad 16 made of a resistor is provided in the output section of the local oscillation circuit, the normal oscillation output is insufficient, and the It was necessary to produce a large output in consideration of the signal loss due to the pad.

By the way, generally, the relationship between the operating current of the local oscillator circuit and the oscillation output is substantially proportional as shown in FIG. Therefore, the local oscillator module needs a large oscillation output to compensate for the loss of the impedance pad 16, and as a result, the operating current of the local oscillation circuit increases.

Further, the impedance pad 16 is
As shown in FIG. 4, the configuration is such that changes in the oscillation frequency due to load changes that occur when the local oscillation circuit is connected to the mixer circuit are suppressed. However, in practice, even if this impedance pad 16 is provided, when it is connected to the mixer circuit,
The oscillation frequency changes due to the load fluctuation, and there is a problem that the oscillation frequency needs to be readjusted when the local oscillation circuit module is mounted on the SHF receiver.

Therefore, the present invention has been made in view of the above-mentioned drawbacks, and a mixer circuit and a local oscillation circuit are formed on the same substrate, and the oscillation frequency is not adjusted by a simple construction. Is to measure.

[0011]

SUMMARY OF THE INVENTION The present invention is a satellite 1
In the SHF receiver that receives and amplifies a signal of 2 GHz band and down-converts it to a signal of 1 GHz band, the SH
The mixer circuit and the local oscillator circuit forming the F receiver are formed on the same ceramic substrate, and the mixer circuit and the local oscillator circuit are integrated by housing the ceramic substrate in a metal case. The present invention provides an SHF receiver.

[0012]

[Function] The local oscillator and the mixer circuit are formed on the same substrate, and by integrating and designing them, the influence of the load of the mixer circuit connected to the signal output unit of the local oscillator circuit is considered. It is possible to design a circuit that has This makes it possible to eliminate the impedance pad 16 that was necessary in the past, and the oscillation output of the oscillation circuit can be suppressed to a low level by the loss of the impedance pad 16, resulting in the consumption current of the local oscillation circuit. Can be reduced.

Further, since the local oscillation circuit and the mixer circuit are integrated, the oscillation frequency can be adjusted including the influence of the load fluctuation, so that the oscillation frequency required for mounting the satellite broadcasting receiver can be adjusted again. No adjustment is necessary.

[0014]

EXAMPLES Hereinafter, the SHF of the present invention will be described with reference to FIGS. 1 and 3.
The local oscillation circuit and the mixer circuit of the receiver will be described.

FIG. 1a is a block diagram of the local oscillator circuit and the mixer circuit, and FIG. 1b is an external view of the local oscillator circuit and the mixer circuit housed in a metal case.

In FIG. 1a, 1 is a dielectric resonator, 2 is a GaAs-FE having a gate, a source, a drain, etc.
T is a terminating resistor, 4 is a bias resistor for the GaAs-FET, 5 is an interdigital pattern for cutting a direct current component, 13 is a power supply terminal, and these constitute a local oscillation circuit.

Further, 6 is a diode for mixer, 7 is a resistor for biasing the diode, 8 is a capacitor for short circuit, 9 is a capacitor for cutting direct current, 10 is an RF band pass filter, 11 is an RF signal input terminal, Reference numeral 12 is an IF signal output terminal, which constitutes a mixer circuit.

The local oscillator circuit and the mixer circuit are formed on the same alumina ceramic substrate 21.

Further, the alumina ceramic substrate 21 is housed in a metal case, and the module shown in FIG. 1b is completed. In FIG. 1b, 14 is a screw for adjusting the oscillation frequency, which is arranged above the dielectric resonator 1, and 15 is a screw.
Is a screw for attaching the local oscillator circuit module.

FIG. 3 shows a circuit configuration example when the module of the present invention is used in an SHF receiver. In the figure,
Reference numeral 18 denotes an SHF receiver board made of a material such as Teflon.

In the SHF receiver of the present invention, generally, a high frequency circuit such as an RF amplifier or a mixer circuit is a Teflon substrate 18.
In the above configuration, the local oscillation circuit and the mixer circuit are formed on the alumina ceramic substrate 21 having a high dielectric constant (dielectric constant is about 5 times that of the Teflon substrate), and therefore half of the space is required due to the wavelength shortening rate. It is possible to form a circuit in the SHF receiver, and it is possible to significantly reduce the size of the SHF receiver.

Further, according to the present invention, by forming the local oscillation circuit and the mixer circuit on the same substrate, it becomes possible to design and manufacture the circuit in consideration of the load fluctuation of the local oscillation signal input terminal of the mixer circuit. The required impedance pad is no longer needed, the loss due to the impedance pad (about 3 dB) is eliminated, and the operating current is reduced (about 15 dB).
mA) is possible.

Furthermore, since the mixer circuit is built in the module, the connection terminal of the module is the RF signal input terminal 1
1, the IF signal output terminal 12 and the power supply terminal 13 are provided, and the local oscillation signal output terminal and the power supply terminal can be omitted as compared with the conventional case.

[0024]

According to the present invention, in the module used in the SHF receiver, the impedance pad conventionally provided in the signal output section of the local oscillation circuit can be eliminated, and the level of the output signal is increased, so that the local level is increased. It is possible to greatly reduce the current consumption of the oscillator circuit. Further, according to the module of the present invention, it is not necessary to readjust the oscillation frequency, which was required when the module was mounted on the SHF receiver in the related art, so that it is possible to reduce the man-hours for adjusting the oscillation frequency when manufacturing the SHF receiver.

[Brief description of drawings]

FIG. 1 is a structural example of a module according to the present invention.

FIG. 2 Example of configuration of conventional module (local oscillation circuit)

FIG. 3 is a structural example of an SHF receiver using the module of the present invention.

FIG. 4 SHF using a conventional module (local oscillation circuit)
Receiver configuration example

[Fig. 5] Relation between operating current of local oscillator and oscillation output

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric resonator 2 GaAs-FET 3 Termination resistance 4 Bias resistance of GaAs-FET 5 Interdigital pattern for DC cut 6 Mixer diode 7 Resistor for diode bias 8 Short circuit capacitor 9 DC cut capacitor 10 RF bandpass filter 11 RF Signal input terminal 12 IF signal output terminal 13 Power supply terminal 14 Oscillation frequency adjusting screw 15 Module mounting screw 16 Impedance pad 17 Local oscillation signal output terminal 18 Teflon substrate with SHF receiver 19 Local oscillation signal input terminal 20 Module 21 Alumina ceramic substrate

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H05K 9/00 C 7128-4E

Claims (1)

Claims: 1. Receiving a 12 GHz band signal from a satellite,
SH that amplifies and down-converts to a 1 GHz band signal
In the F receiver, the mixer circuit and the local oscillator circuit which form the SHF receiver are formed on the same ceramic substrate, and the ceramic substrate is housed in a metal case to form the mixer circuit and the local oscillator circuit. SHF receiver characterized by being integrated.