JPH0744384B2 - Divider circuit - Google Patents

Description

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

2. Description of the Related Art Conventionally, digital divider circuits using flip-flops are often used for frequency dividers that are indispensable in PLLs (phase-locked loops) used to stabilize local sources of mobile phones and various radios. There is. 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 the same time as operating at a high frequency, and at the same time 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 is a circuit diagram of an analog frequency dividing circuit represented by, for example, Japanese Patent Application No. 58-159404. 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. 7,8 is D
C block capacitors, 9 are high frequency bypass capacitors, 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.

Problems to be Solved by the Invention The analog frequency dividing circuit configured as described above has a simple configuration in which an LC series circuit including a capacitor 5 and an inductor 6 is added in parallel between the anode and the cathode of the frequency dividing diode 4. Although it is a frequency divider circuit that operates with low power consumption even in the high frequency range of the GHz band, it is desirable to take measures to secure the operation stability against temperature change of forward characteristic of diode and power supply voltage change. , Left a problem.

Means for Solving Problems The first aspect of the present invention is to provide an input signal supplied from the anode side and a frequency dividing diode element which outputs a frequency dividing signal from the cathode side, in parallel with the frequency dividing diode element. LC series circuit consisting of connected capacitor element and inductance element, power supply biasing the anode side of the dividing diode element, anode side connected to the anode side of the dividing diode element, cathode side grounded voltage supply And a diode element for use.

Secondly, the present invention relates to 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. An LC series circuit, a power supply for biasing the cathode side and the anode side of the frequency dividing diode element, an anode side connected to the anode side of the frequency dividing diode element, and a cathode side grounded voltage supply diode element. It is provided.

By using a diode in the circuit that biases the frequency-dividing diode and utilizing its temperature characteristics and clamp characteristics, it is possible to cancel the temperature change of the frequency-dividing diode and to secure the operation stability against power supply voltage fluctuations. .

First Embodiment 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. 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 DC block capacitors, and 9 is a high frequency bypass capacitor. Reference numerals 10 to 13 are resistors for supplying bias voltage, and 14 is a diode for supplying bias voltage.

In the above configuration, 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.

FIG. 2 is a circuit diagram of a frequency dividing circuit according to the second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals. 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.

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 reference numerals. Reference numerals 17 and 18 are resistors for supplying bias voltage, 19 is a diode for supplying bias voltage, and 20 is a choke coil for 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.

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 reference numerals. Reference numerals 17, 21 are resistors for supplying bias voltage, 22 is a choke coil, and 23 is a diode for supplying bias voltage. Also in this embodiment, as in FIG. 3, the bias circuit is simplified by biasing only the anode side of the frequency dividing diode 4.

In addition to temperature compensation, the present embodiment makes the anode voltage of the frequency dividing diode 4 constant due to the clamp characteristic of the diode 23 even when the power supply voltage changes, and operates stably even when the power supply voltage changes.

The bias method has been described so far when it is applied to both the anode side and the cathode side of the frequency dividing diode 4, or when it is applied only to the anode side, but only the cathode side (however, the power supply becomes negative). Needless to say, it may be applied to.

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 reference numerals. Reference numerals 24 and 25 are resistors for supplying bias voltage, 26 is a diode for supplying bias voltage, and 27 is a capacitor for harmonic bypass.

In this embodiment, a frequency divider circuit is inserted in parallel with the 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.

As described above, in the present invention, the anode of the frequency dividing diode,
By using a diode in the bias circuit of the divider circuit in which an LC series circuit consisting of a capacitor and an inductor is added in parallel between the cathodes, the temperature characteristics of the divider circuit can be improved and the power supply voltage can be changed. Its industrial utility value is extremely high, such as ensuring the stability of operation.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a frequency dividing circuit according to an embodiment of the present invention,
2 to 5 are circuit diagrams of a frequency dividing circuit showing another embodiment of the present invention, and FIG. 6 is a circuit diagram of a conventional analog frequency dividing circuit. 1 ... Signal input terminal, 2 ... Division output terminal, 3 ... Power supply terminal, 4 ... Division diode, 5,7-9,27 ... Capacitor, 6,20,22 ... Inductor, 10- 13,15,17 ~ 18,21,24
~ 25 …… resistors, 14,16,19,23 …… diodes.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mitsuo Makimoto 3-10-1, Higashisanda, Tama-ku, Kawasaki City, Kanagawa Prefecture Matsushita Giken Co., Ltd. (72) Sadahiko Yamashita 3-chome, Higashimita, Tama-ku, Kawasaki City, Kanagawa Prefecture No. 10 No. 1 Matsushita Giken Co., Ltd. (56) References JP-A-60-51304 (JP, A)

Claims (2)

[Claims] 1. An LC comprising an input signal supplied from the anode side and a frequency-divided diode element outputting a frequency-divided signal from the cathode side, and a capacitor element and an inductance element connected in parallel to the frequency-divided diode element. A frequency divider circuit comprising a series circuit, a power supply biasing the anode side of the frequency divider diode element, and a voltage supply diode element whose anode side is connected to the anode side of the frequency divider diode element and whose cathode side is grounded. 2. An LC comprising an input signal supplied from the anode side and a frequency-divided diode element outputting a frequency-divided signal from the cathode side, and a capacitor element and an inductance element connected in parallel to the frequency-divided diode element. A series circuit; a power supply for biasing the cathode side and the anode side of the frequency dividing diode element; and a voltage supply diode element whose anode side is connected to the anode side of the frequency dividing diode element and whose cathode side is grounded. Circuit.