Voltage controlled oscillator

A technology of voltage-controlled oscillators and transistors, applied in power oscillators, automatic power control, electrical components, etc., can solve the problem of reducing the tuning range, reducing the maximum frequency of the voltage-controlled oscillator, and reducing the phase noise performance of the voltage-controlled oscillator, etc. problem, achieve low phase noise performance, wide tuning range

Inactive Publication Date: 2008-07-02
BEIJING LHWT MICROELECTRONICS
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Problems solved by technology

[0008] However, using figure 2 The voltage-controlled oscillator with the structure shown has several disadvantages: 1) Transistors M1, M2, M3, and M4 have certain parasitic capacitances, which will be a big problem for high-frequency voltage-controlled oscillators
On the one hand, the available tu

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Embodiment Construction

[0026] The specific implementation of the present invention will be further described below in conjunction with accompanying drawing:

[0027] The invention adopts on-chip integrated active inductance technology to realize a voltage-controlled oscillator with low phase noise and wide tuning range. The VCO in the active inductor structure is in figure 2 On the basis of the on-chip integrated voltage-controlled oscillator of the common structure shown, two resistors and two capacitors are added, and the connection mode of the cross-coupling of transistors M3 and M4 is changed. Through transistors M3, M4 and the added two resistors and The two capacitors form two active inductors and provide bias current for the voltage-controlled oscillator while providing noise isolation from ground (GND).

[0028] Such as image 3 As shown, the present invention includes: transistors M1, M2, M3 and M4, an integrated on-chip inductor L, a variable capacitor Cv, two resistors RL1, RL2 and two...

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Abstract

The invention relates to a voltage controlled oscillator, which comprises four transistors, an integrated on-chip inductor and two symmetric variable capacitors, wherein, two transistors realize negative resistance through cross coupling, thereby providing energy to oscillate an LC circuit comprising the inductor and the variable capacitors; by changing the capacitance of the variable capacitors, different output frequencies of the oscillator are obtained. The invention also comprises two resistors with the same value and two capacitors with the same value; a grid terminal of one of the rest transistors is connected with a terminal of a resistor and a terminal of a capacitor at the same time, which jointly form an active inductor; a grid terminal of the last transistor is connected with a terminal of a resistor and a terminal of a capacitor at the same time, thus jointly forming another active inductor; the two active inductors provide bias current for the voltage controlled oscillator. The invention enlarges the tuning range of the voltage controlled oscillator and reduces the phase noise.

Description

technical field [0001] The invention relates to radio transmission technology, in particular to a voltage-controlled oscillator in a wireless transceiver system. Background technique [0002] With the rapid development of integrated circuit technology, it is possible to highly integrate the wireless transceiver system. An integrated voltage controlled oscillator (vco) and frequency synthesizer is a very important and critical part of a wireless transceiver system. Currently popular wireless communication standards, such as Wireless Local Area Network (WLAN), GSM (Globle System for Mobile Communication), WiMax (Worldwide Interoperability for Microwave Access, Microwave Access Global Interoperability), etc., all require voltage-controlled oscillators to have wide tuning range and low phase noise. [0003] The wide tuning range refers to that within a certain range of control voltage variation, the output frequency of the voltage-controlled oscillator is based on a certain ce...

Claims

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Application Information

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IPC IPC(8): H03B5/04H03B5/12H03L7/099
Inventor 王海永吴南健寿国梁
Owner BEIJING LHWT MICROELECTRONICS
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