JP2529541B2 - Divider circuit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analog frequency divider circuit which operates stably over a wide band even at high frequencies in the GH _Z band.

[0002]

2. Description of the Related Art Conventionally, a digital frequency divider circuit using a flip-flop is often used as a frequency divider which is indispensable in a PLL (Phase Locked Loop) used for stabilizing a local source of an automobile telephone or various radios. Has been. However, the digital frequency divider circuit is composed of many transistors and diodes, which not only complicates the circuit but also makes it difficult to manufacture at high frequency and causes a large increase in power consumption. Have
Therefore, as the demand for higher frequencies and lower power consumption has increased, analog frequency divider circuits have also come to be used. Hereinafter, the analog frequency dividing circuit will be described with reference to the drawings.

FIG. 6 shows, for example, Japanese Patent Application No. 58-15940.
4 is a circuit diagram of an analog frequency dividing circuit represented by the specification of No. 4 and the like. Reference numeral 1 is a signal input terminal, 2 is a frequency division output terminal, and 3 is a power supply terminal. Reference numeral 4 is a frequency dividing diode, and a circuit including a capacitor 5 and an inductor 6 is added between the anode and the cathode. Reference numerals 7 and 8 are capacitors for DC block, 9 are capacitors for bypassing higher harmonic waves, and 10 to 12 are resistors for supplying bias voltage. The operation of this frequency divider having the above-described configuration utilizes the parametric operation due to the non-linearity of the diode capacitance and the mixer operation for maintaining this.

[0004]

The analog frequency dividing circuit having the above-described structure has a simple structure in which the LC series circuit including the capacitor 5 and the inductor 6 is added in parallel between the anode and the cathode of the frequency dividing diode 4. Therefore, even though it is a frequency divider circuit that operates with low power consumption even in the high frequency range of the GH _Z band, measures can be taken to secure operational stability against temperature changes in the forward characteristic of the diode and power supply voltage changes. It was hoped and left a problem.

[0005]

The present invention has been made in view of the above problems.
An input signal is supplied from the anode side and a frequency dividing diode element that outputs a frequency dividing signal from the cathode side, an LC series circuit including a capacitor element and an inductance element connected in parallel to the frequency dividing diode element,
A power source for biasing the anode side of the frequency dividing diode element, an anode side thereof is connected to the power source, a cathode side thereof is connected to a cathode side of the frequency dividing diode element, and the cathode side of the frequency dividing diode element is biased by the power source. A diode element for voltage supply is provided.

[0006]

[Function] A diode is used in a circuit for biasing the frequency dividing diode, and the temperature characteristic and the clamp characteristic are used to cancel the temperature change of the frequency dividing diode or to secure the operation stability against the fluctuation of the power supply voltage. Is.

[0007]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram of a frequency dividing circuit according to the first embodiment of the present invention. Reference numeral 1 is a signal input terminal, 2 is a frequency division output terminal, and 3 is a power supply terminal. 4 is a frequency dividing diode,
A circuit including a capacitor 5 and an inductor 6 is added between the anode and the cathode. Reference numerals 7 and 8 are DC block capacitors, and 9 is a capacitor for harmonic bypass.
Reference numerals 10 to 13 are resistors for supplying bias voltage, and 14 is a diode for supplying bias voltage.

In the above structure, the frequency dividing operation occurs when the frequency dividing diode 4 is biased in the forward direction, but the forward characteristic of the frequency dividing diode 4 changes depending on the temperature. To compensate for this temperature change, the bias voltage of the frequency dividing diode 4 may be lowered when the temperature rises and raised when the temperature falls. In this embodiment, the anode voltage of the frequency dividing diode 4 is changed by utilizing the temperature characteristic of the diode 14 to realize temperature compensation.

Next, a second embodiment of the present invention will be described with reference to FIG. (Embodiment 2) FIG. 2 is a circuit diagram of a frequency dividing circuit according to a second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same numbers. Reference numerals 10, 12 and 15 are resistors for supplying bias voltage, and 16 is a diode for supplying bias voltage.

In this embodiment, the cathode voltage of the frequency dividing diode 4 is changed by utilizing the temperature characteristic of the diode 16 to realize temperature compensation. As described above, temperature compensation can be performed by changing the anode voltage or the cathode voltage of the frequency dividing diode 4 in accordance with the temperature change by utilizing the temperature characteristic of the diode.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a circuit diagram of a frequency dividing circuit according to the third embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same numbers. Reference numerals 17 and 18 are resistors for supplying a bias voltage, 1
Reference numeral 9 is a diode for supplying a bias voltage, and 20 is a choke coil for the frequency-divided output.

In this embodiment, the bias circuit is simplified so that only the anode side of the frequency dividing diode 4 is biased. Since the anode voltage of the frequency dividing diode 4 changes according to the temperature change, temperature compensation is possible.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a circuit diagram of a frequency dividing circuit according to the fourth embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same numbers. Reference numerals 17 and 21 are resistors for supplying a bias voltage, 2
Reference numeral 2 is a choke coil, and 23 is a bias voltage supply diode. Also in this embodiment, as in FIG. 3, the frequency dividing diode 4 is used.
The bias circuit is simplified by biasing only the anode side.

In this embodiment, in addition to the temperature compensation, the clamp characteristic of the diode 23 is applied to the fluctuation of the power supply voltage.
The anode voltage of the frequency dividing diode 4 becomes constant, and it operates stably even if the power supply voltage fluctuates.

Up to now, the bias method has been described for the case where the voltage is applied to both the anode side and the cathode side of the frequency dividing diode 4, or the case where the voltage is applied only to the anode side. Needless to say, it may be applied to the above.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a circuit diagram of a frequency dividing circuit according to the fifth embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same numbers. 24 and 25 are resistors for supplying bias voltage, 2
6 is a diode for supplying a bias voltage, and 27 is a capacitor for harmonic bypass.

In this embodiment, a frequency dividing circuit is inserted in parallel with a signal line. In this embodiment as well, not only temperature compensation but also the voltage applied to the frequency dividing diode 4 becomes constant due to the clamp characteristic of the diode 26 against fluctuations in the power supply voltage, and stable operation is achieved against fluctuations in the power supply voltage.

As described above, the bias voltage applying method using this diode is effective regardless of whether the frequency dividing diode 4 is inserted in the signal line in series or in parallel.

[0023]

As described above, according to the present invention, the diode is used in the bias circuit of the frequency dividing circuit in which the LC series circuit including the capacitor and the inductor is added in parallel between the anode and the cathode of the frequency dividing diode. The temperature utilization of the frequency divider circuit is improved, and the stability of the operation is ensured even when the power supply voltage fluctuates.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a frequency dividing circuit according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a frequency dividing circuit showing another embodiment of the present invention.

FIG. 3 is a circuit diagram of a frequency dividing circuit showing another embodiment of the present invention.

FIG. 4 is a circuit diagram of a frequency dividing circuit showing another embodiment of the present invention.

FIG. 5 is a circuit diagram of a frequency dividing circuit showing another embodiment of the present invention.

FIG. 6 is a circuit diagram of a conventional analog frequency divider circuit.

[Explanation of symbols]

1 signal input terminal 2 frequency division output terminal 3 power supply terminal 4 frequency division diode 5,7-9,27 capacitor 6,20,22 inductor 10-13,15,17-18,21,24-25 resistance 14,16, 19,23 Diode

Front page continuation (72) Mitsuo Makimoto 3-10-1, Higashisanda, Tama-ku, Kawasaki-shi, Kanagawa Matsushita Giken Co., Ltd. (72) Sadahiko Yamashita 3--10-1, Higashisanda, Tama-ku, Kawasaki, Kanagawa No. Matsushita Giken Co., Ltd.

Claims (1)

(57) [Claims] 1. An L including a frequency-dividing diode element which is supplied with an input signal from the anode side and outputs a frequency-dividing signal from the cathode side, and a capacitor element and an inductance element which are connected in parallel to the frequency-dividing diode element.
A C series circuit, a power supply for biasing the anode side of the frequency dividing diode element, an anode side is connected to the power source, a cathode side is connected to a cathode side of the frequency dividing diode element, and the power source controls the frequency of the frequency dividing diode element. A frequency divider circuit comprising a voltage-supplying diode element for biasing the cathode side.