Push-pull Schottky diode stack frequency multiplication circuit and frequency multiplication device

Abstract

The present invention relates to a push-pull Schottky diode stack frequency multiplication circuit and a frequency multiplication device thereof. The push-pull Schottky diode stack frequency multiplication circuit includes a push-pull diode frequency multiplication circuit, the push-pull diode frequency multiplication circuit includes a plurality of Schottky diodes electrically connected one by one, the Schottky diodes forming a diode push-pull structure; and a frequency multiplication device of the push-pull Schottky diode stack frequency multiplication circuit, the frequency multiplication device including the above-mentioned push-pull Schottky diode stack frequency multiplication circuit. The circuit of the present invention is simple; no external power supply is required, the circuit power consumption is small; no additional energy and interference are introduced, and the frequency multiplication phase noise deterioration is small.

Description

Technical Field

[0001] The invention relates to the field of diode frequency multipliers, in particular to a push-pull Schottky diode stack frequency multiplier circuit and a frequency multiplier device thereof. Background Art

[0002] With the development of electronic information technology and microwave communication technology, the requirements for the system clock or frequency source are getting higher and higher, and high-performance frequency multiplication schemes are often required to achieve frequency multiplication. In order to achieve the frequency multiplication of the required signal, the commonly used methods are: variable capacitance diode frequency multiplication, step diode frequency multiplication, triode frequency multiplication, mixing frequency multiplication, amplifier saturation frequency selection to achieve frequency multiplication, etc. Among these methods, diode and triode frequency multiplication both use the nonlinearity of transistors to generate rich harmonics, which are passive frequency multiplication; triode and amplifier saturation frequency selection to achieve frequency multiplication are both active circuits, which require additional power supply for power supply, and the phase noise deteriorates greatly after frequency multiplication. Varactor diode and step diode frequency multiplication mainly use the nonlinearity of diodes to generate harmonics. Varactor diode frequency multiplication has low efficiency, high requirements for front and rear stage matching, and high debugging difficulty. Step diode also uses the nonlinear performance of diodes, but the frequency multiplication circuit is complex and the reference signal needs to be amplified before the step diode can be driven. The circuit power consumption is large and the cost is high. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a push-pull Schottky diode stack frequency doubling circuit and a frequency doubling device thereof, which has a simple circuit; does not require an external power supply, and has low circuit power consumption; does not introduce any additional energy and interference, and has low frequency doubling phase noise deterioration.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A push-pull Schottky diode stack frequency multiplier circuit comprises a push-pull diode frequency multiplier circuit, wherein the push-pull diode frequency multiplier circuit comprises a plurality of Schottky diodes electrically connected one by one, and the Schottky diodes form a diode push-pull structure.

[0006] Further, the Schottky diode includes a first diode, a second diode, a third diode and a fourth diode, the first diode, the second diode, the third diode and the fourth diode are connected in series one by one, and the second diode and the third diode are connected in series in a push-pull manner;

[0007] The push-pull diode frequency multiplication circuit further includes an isolation circuit, which isolates odd harmonic components from even harmonic components between the multiple Schottky diodes;

[0008] The push-pull diode frequency multiplication circuit further comprises a frequency selection output circuit, and the frequency selection output circuit performs frequency selection output on the odd harmonic components and the even harmonic components isolated by the isolation circuit.

[0009] Furthermore, the forward ends of the second diode and the third diode are connected back to ground.

[0010] Furthermore, the isolation circuit includes an isolation inductor, one end of the isolation inductor is electrically connected between the second diode and the third diode, and the other end of the isolation inductor is electrically connected between the first diode and the second diode and between the third diode and the fourth diode.

[0011] Furthermore, the frequency selection output circuit includes an odd capacitor and an even capacitor, one end of the odd capacitor is electrically connected behind the fourth diode, the other end of the odd capacitor is electrically connected to one end of the even capacitor, and the other end of the even capacitor is electrically connected between the second diode and the third diode.

[0012] Furthermore, an input end of the push-pull diode frequency multiplier circuit is electrically connected to an input matching circuit.

[0013] Furthermore, the input matching circuit includes an input matching inductor and an input matching capacitor, and the input matching inductor and the input matching capacitor form a “Γ” type matching network.

[0014] Furthermore, the output end of the push-pull diode frequency multiplier circuit is electrically connected to an output frequency selection matching circuit.

[0015] Furthermore, the output frequency selection matching circuit includes a first output inductor, a second output inductor, a third output inductor, a first output capacitor, a second output capacitor and a third output capacitor; the first output inductor, the second output inductor and the first output capacitor are connected in parallel to the output end of the push-pull diode frequency multiplier circuit, the other end of the first output inductor and the first output capacitor are both grounded, the other end of the second output inductor is connected to one end of the second output capacitor, the third output inductor and the third output capacitor are connected in parallel to the other end of the second output capacitor, and the other end of the third output inductor and the third output capacitor are both grounded.

[0016] A frequency multiplying device for a push-pull Schottky diode stack frequency multiplying circuit, the frequency multiplying device comprising the above-mentioned push-pull Schottky diode stack frequency multiplying circuit.

[0017] The beneficial effects of the present invention are:

[0018] (1) Since multiple common Schottky diodes are used to form a push-pull structure, the frequency doubling circuit is simple;

[0019] (2) Since passive diodes are used to achieve frequency doubling, the passive circuit does not require an external power supply, thereby reducing circuit power consumption;

[0020] (3) Passive diodes are used to achieve frequency doubling. The circuit does not introduce any additional energy and interference, and the frequency doubling phase noise deterioration is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a principle block diagram of the present invention;

[0022] In the figure, 1- push-pull diode frequency doubling circuit, 2- input matching circuit, 3- output frequency selection matching circuit. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0025] Embodiment 1:

[0026] like Figure 1 As shown, the push-pull Schottky diode stack frequency multiplier circuit includes a push-pull diode frequency multiplier circuit 1, wherein the push-pull diode frequency multiplier circuit 1 includes a plurality of Schottky diodes electrically connected one by one, and the Schottky diodes form a diode push-pull structure.

[0027] The Schottky diode includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, which are connected in series one by one, and the second diode D2 and the third diode D3 are connected in series in a push-pull manner.

[0028] The forward ends of the second diode D2 and the third diode D3 are connected back to back.

[0029] Four independent Schottky diodes form a push-pull series structure, which produces rich harmonic components under the nonlinear performance of the diodes. Figure 1 The connection shown forms a diode push-pull structure, which can enrich the harmonic components and thus improve the frequency doubling efficiency.

[0030] Since multiple common Schottky diodes are used to form a push-pull structure, the frequency doubling circuit is simple;

[0031] Since passive diodes are used to achieve frequency doubling, the passive circuit does not require an external power supply, thereby reducing circuit power consumption;

[0032] Passive diodes are used to achieve frequency doubling. The circuit does not introduce any additional energy and interference, and the frequency doubling phase noise deterioration is small.

[0033] The push-pull diode frequency multiplication circuit 1 further comprises an isolation circuit, which isolates odd harmonic components from even harmonic components between the multiple Schottky diodes.

[0034] The isolation circuit includes an isolation inductor L2, one end of which is electrically connected between the second diode D2 and the third diode D3, and the other end of which is electrically connected between the first diode D1 and the second diode D2 and between the third diode D3 and the fourth diode D4.

[0035] The isolation inductor L2 has the function of isolating odd-order harmonics and even-order harmonics. As an isolation device, the isolation inductor L2 isolates the odd-order harmonics and even-order harmonics, and isolates the odd-order harmonic components from the even-order harmonic components between the multiple Schottky diodes.

[0036] The push-pull diode frequency multiplication circuit 1 further comprises a frequency selection output circuit, and the frequency selection output circuit performs frequency selection output on the odd harmonic components and the even harmonic components isolated by the isolation circuit.

[0037] The frequency selection output circuit includes an odd capacitor C2 and an even capacitor C3, one end of the odd capacitor C2 is electrically connected to the fourth diode D4, the other end of the odd capacitor C2 is electrically connected to one end of the even capacitor C3 for output, and the other end of the even capacitor C3 is electrically connected between the second diode D2 and the third diode D3.

[0038] The first diode D1 is connected in series with the second diode D2. The forward end of the second diode D2 outputs even-order harmonic components 200MHz, 400MHz, 600MHz through the even-order capacitor C3.

[0039] The third diode D3 is connected in series with the fourth diode D4, and the negative end of the fourth diode D4 outputs odd harmonic components 300MHz, 500MHz, 700MHz, etc. through the odd capacitor C2.

[0040] The odd capacitor C2 and the even capacitor C3 respectively perform frequency selection output on the odd harmonic components and the even harmonic components. Under different frequency multiplication requirements, only one frequency multiplication signal can be selected for output, and the actual use of the circuit is extremely convenient.

[0041] Different ports in the push-pull diode frequency multiplication circuit 1 output different odd and even harmonic components, and odd and even harmonics are selected through odd capacitors C2 and even capacitors C3, which is convenient for use in different occasions.

[0042] The odd-numbered capacitor C2 and the even-numbered capacitor C3 are used to respectively lead out odd-numbered frequency multiplication signals and even-numbered frequency multiplication signals, so as to facilitate the realization of circuits with different frequency multiplication requirements.

[0043] The input end of the push-pull diode frequency multiplier circuit 1 is electrically connected to an input matching circuit 2 .

[0044] The input matching circuit 2 includes an input matching inductor L1 and an input matching capacitor C1, and the input matching inductor L1 and the input matching capacitor C1 form a “Γ” type matching network.

[0045] The impedance of the input matching circuit 2 from the input matching inductor L1 to the first diode D1 is ensured to be 50Ω.

[0046] The input matching circuit 2 transmits the sine wave (eg, 100 MHz) inputted from the port to the first diode D1 without loss.

[0047] The input signal is added into the push-pull diode frequency multiplier circuit 1 through a “Γ” type matching network composed of an input matching inductor L1 and an input matching capacitor C1.

[0048] The output end of the push-pull diode frequency multiplier circuit 1 is electrically connected to an output frequency selection matching circuit 3 .

[0049] The output frequency selection matching circuit 3 includes a first output inductor L3, a second output inductor L4, a third output inductor L5, a first output capacitor C4, a second output capacitor C5 and a third output capacitor C6; the first output inductor L3, the second output inductor L4 and the first output capacitor C4 are connected in parallel to the output end of the push-pull diode frequency multiplier circuit 1, the other end of the first output inductor L3 and the first output capacitor C4 are both grounded, the other end of the second output inductor L4 is connected to one end of the second output capacitor C5, the third output inductor L5 and the third output capacitor C6 are connected in parallel to the other end of the second output capacitor C5, and the other ends of the third output inductor L5 and the third output capacitor C6 are both grounded.

[0050] One end where the second output capacitor C5 is connected to the third output inductor L5 is the output end of the output frequency selection matching circuit 3 .

[0051] The output frequency selection and matching circuit 3 forms a frequency selection and matching port through the first output inductor L3, the second output inductor L4, the third output inductor L5, the first output capacitor C4, the second output capacitor C5 and the third output capacitor C6.

[0052] The output frequency selection matching circuit 3 mainly realizes matching between the output end of the output frequency selection matching circuit 3 and the push-pull diode frequency multiplication circuit 1 to 50Ω.

[0053] The output frequency selection matching circuit 3 can also implement filtering and frequency selection for the output frequency while completing the matching function.

[0054] After the frequency doubling, the circuit series matching circuit matches the input and output interfaces to 50Ω, and the matching circuit is implemented through a filtering network. While matching, frequency selection can also be performed to further reduce the frequency doubling spurious.

[0055] In this embodiment, the first output inductor L3, the second output inductor L4, the third output inductor L5, the first output capacitor C4, the second output capacitor C5 and the third output capacitor C6 form a 500 MHz bandpass filter to achieve 500 MHz signal frequency selection.

[0056] The first output inductor L3, the second output inductor L4, the third output inductor L5, the first output capacitor C4, the second output capacitor C5 and the third output capacitor C6 form a 50Ω matching network, and the entire circuit presents an impedance of 50Ω when viewed from the OUT port.

[0057] Matching circuits (input matching circuit 2 and output frequency selection matching circuit 3) are added before and after the push-pull diode frequency doubling circuit 1, so that the input and output ports of the entire frequency doubling link have a good standing wave coefficient, which is convenient for integration into other circuits.

[0058] A frequency multiplying device for a push-pull Schottky diode stack frequency multiplying circuit, the frequency multiplying device comprising the above-mentioned push-pull Schottky diode stack frequency multiplying circuit.

[0059] The circuit structure of the present invention is simple, the difficulty of assembly and debugging is low, the frequency doubling phase noise deterioration is small, the circuit reliability is high, the cost is low, the volume size is small, the integration is convenient, and the practicality and promotion value are very high.

[0060] The present invention utilizes the nonlinearity of Schottky diodes to form a push-pull diode stack to achieve frequency doubling. The circuit structure is simple, debugging is convenient, odd and even harmonics can be selectively output for easy use in different occasions, the frequency doubling efficiency can be selected according to the frequency by adjusting the matching circuit, the passive structure has a low additional phase noise index, and the cost is low. The invention has high practicality and promotion value.

[0061] The present invention satisfies the basic frequency multiplication function and at the same time makes the frequency multiplier have good performance index, low cost and is convenient for use in various occasions.

[0062] The present invention has a simple structure and few debugging points (only the inductor L2 needs to be debugged), and does not require excessive debugging.

[0063] The present invention uses a universal Schottky diode combination to achieve frequency doubling, and the diodes have multiple optional models, stable performance, and a wide range of applications. The present invention is mainly used in the field of frequency doubling and has high practical value and promotion value.

[0064] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. Push-pull Schottky diode stack frequency doubling circuit, Features: A push-pull diode frequency multiplier circuit is included, wherein the push-pull diode frequency multiplier circuit includes a plurality of Schottky diodes electrically connected one by one, and the Schottky diodes form a diode push-pull structure; The Schottky diode comprises a first diode, a second diode, a third diode and a fourth diode, the first diode, the second diode, the third diode and the fourth diode are connected in series one by one, and the second diode and the third diode are connected in series in a push-pull manner; The push-pull diode frequency multiplication circuit further includes an isolation circuit, which isolates odd harmonic components from even harmonic components between the multiple Schottky diodes; The push-pull diode frequency multiplication circuit further comprises a frequency selection output circuit, which performs frequency selection output on the odd harmonic components and the even harmonic components isolated by the isolation circuit; The forward ends of the second diode and the third diode are connected back to back to the ground; The isolation circuit comprises an isolation inductor, one end of the isolation inductor is electrically connected between the second diode and the third diode, and the other end of the isolation inductor is electrically connected between the first diode and the second diode and between the third diode and the fourth diode; The frequency selection output circuit includes an odd capacitor and an even capacitor, one end of the odd capacitor is electrically connected behind the fourth diode, the other end of the odd capacitor is electrically connected to one end of the even capacitor, and the other end of the even capacitor is electrically connected between the second diode and the third diode.

2. The push-pull Schottky diode stack frequency multiplication circuit according to claim 1, Features: The input end of the push-pull diode frequency multiplier circuit is electrically connected to an input matching circuit.

3. The push-pull Schottky diode stack frequency doubling circuit according to claim 2, Features: The input matching circuit includes an input matching inductor and an input matching capacitor, and the input matching inductor and the input matching capacitor form a "Γ" type matching network.

4. The push-pull Schottky diode stack frequency doubling circuit according to claim 1, Features: The output end of the push-pull diode frequency multiplier circuit is electrically connected to an output frequency selection matching circuit.

5. The push-pull Schottky diode stack frequency doubling circuit according to claim 4, Features: The output frequency selection matching circuit includes a first output inductor, a second output inductor, a third output inductor, a first output capacitor, a second output capacitor and a third output capacitor; the first output inductor, the second output inductor and the first output capacitor are connected in parallel to the output end of the push-pull diode frequency multiplier circuit, the other end of the first output inductor and the first output capacitor are both grounded, the other end of the second output inductor is connected to one end of the second output capacitor, the third output inductor and the third output capacitor are connected in parallel to the other end of the second output capacitor, and the other ends of the third output inductor and the third output capacitor are both grounded.

6. Frequency doubling device of push-pull Schottky diode stack frequency doubling circuit, Features: The frequency doubling device comprises the push-pull Schottky diode stack frequency doubling circuit as described in any one of claims 1-5.

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