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Filter circuit and voltage-controlled oscillating circuit

A filter circuit and branch circuit technology, which is applied in the field of voltage-controlled oscillation circuits, can solve the problems that useless signals cannot be fully offset.

Inactive Publication Date: 2010-05-26
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the filter circuit described in Patent Document 1 requires an AD converter for AD-converting the signal in the first path and a delay circuit for delaying the signal in the second path according to the delay amount of the first path.
Furthermore, it is necessary to integrate the delay amount of the delay circuit with the delay amount of the first path, and if the delay amount does not match, there is a problem that unnecessary signals cannot be sufficiently canceled out.

Method used

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  • Filter circuit and voltage-controlled oscillating circuit
  • Filter circuit and voltage-controlled oscillating circuit
  • Filter circuit and voltage-controlled oscillating circuit

Examples

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Effect test

Deformed example 1

[0047] figure 2 is true figure 1 A configuration diagram of Modification 1 in which the circuit configuration after the oscillator circuit section 1 in the shown voltage controlled oscillator is modified. The notch circuit has the same structure as the above-mentioned embodiment. The oscillation circuit unit 1 is omitted from illustration.

[0048] Modification 1: The high-frequency transformer directional coupler 40 that simultaneously performs wave splitting and phase inversion as the output splitter circuit 2 is provided at the front end of the filter section, and the high-frequency transformer coupler 50 as the output resynthesis circuit 5 is provided at the front end of the filter section. The rear section of the filter section.

[0049] The high-frequency transformer splitter 40 has a primary side coil 41, secondary side coils 42a, 42b, and an iron core 43. One end of the primary side coil 41 is connected to the emitter of the oscillating transistor 6, and the other ...

Deformed example 2

[0054] Figure 4 is said to be figure 2 A configuration diagram of Modification 2 in which the trap circuit in the shown circuit configuration is replaced by an LC parallel circuit. The trap circuit 60 is constituted by a parallel resonance circuit of an inductor 61 and a capacitor 62 . The trap circuit 70 has the same structure as the trap circuit 60 and is composed of a parallel resonance circuit of an inductor 71 and a capacitor 72 .

[0055] Such as Figure 4 As shown, the inductance value of the trap circuit 60 is set to 1.0nH, the capacity is set to 24pF, and the notch frequency is set to 1.03GHz with respect to the oscillation frequency of 1.0GHz. Furthermore, the inductance value of the trap circuit 70 was set to 1.0 nH, the capacitance was set to 27 pF, and the trap frequency was set to 0.97 GHz.

[0056] Figure 5 is based on Figure 4 The circuit model is shown along with the attached diagram of the results of simulating the filter characteristics with circuit ...

Deformed example 3

[0058] Figure 6 It is a structural diagram of Modification 3. Modification 3 combines an output demultiplexing circuit 2, a trap circuit 3, a trap circuit 4, and a high-frequency transformer coupler 50. The output demultiplexing circuit 2 uses a series connection of transistors Inverting the phase, the above-mentioned trap circuit 3 and trap circuit 4 are constituted by LC series resonant circuits.

[0059] In the notch circuit 3, a notch frequency (fo-Δ) shifted slightly to the low-band side with respect to the oscillation frequency (fo=2.0 GHz) is set. In addition, in the notch circuit 4 , a notch frequency (fo+Δ) shifted slightly to the high frequency band side is set.

[0060] Figure 7 is based on Figure 6 Figure 1. Results of simulated filtering characteristics of the circuit model shown. From the simulation results, it can be seen that steep filter characteristics are realized.

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Abstract

The invention provides a filter circuit and a voltage-controlled oscillating circuit with the same, capable of easily making the delay of two signal circuits consistent and eliminating the undesired signal. The voltage-controlled oscillating circuit comprises: an oscillating circuit (1); an output branching circuit (2) for respectively outputing first, second signals for branching the oscillating signal after mutually inverted phases: trap circuits (3,4) with different trap frequncies coupled with the output branching circuit in parallel with same structure; and an output resynthesizing circuit for synthesizing the output of the trap circuit. The voltage control signal of the oscillating circuit is applied on variable capacitance diodes (32,34) of the trap circuits (3,4) to make the trap frequency of the trap circuits link with the oscillating frequency.

Description

technical field [0001] The present invention relates to a filter circuit and a voltage-controlled oscillation circuit having a filter circuit, which suppresses useless signals such as high-order harmonics included in high-frequency signals output by oscillators, wireless receivers, and other high-frequency devices . Background technique [0002] There is a device for reducing harmonics of the oscillation frequency by connecting a tuning circuit tuned to the oscillation frequency to the output terminal of the voltage controlled oscillator. However, the tuning circuit cannot maintain stable operation over a wide frequency band. On the other hand, in order to suppress unwanted waves in a wide frequency band, a wireless receiver is proposed that branches a high-frequency signal into two paths of opposite phases and synthesizes them (for example, refer to Patent Document 1). [0003] The wireless receiver of Patent Document 1 branches the synthesized signal into two paths. In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/04H03K3/02
CPCH03H2240/00H03B2200/004H03B2202/05H03B5/1203H03H7/1758H03B5/1243H03B5/1231H03B5/1284H03H7/42H03H7/065H03H7/1766H03H7/0115H03B2200/0008H03B2202/086
Inventor 中塚健二五十岚康博
Owner ALPS ALPINE CO LTD
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