Symmetrical voltage controlled oscillator
A voltage-controlled oscillator and frequency tuning technology, which is applied in power oscillators, automatic power control, discontinuous tuning of frequency band selection, etc., can solve problems such as low linearity, unreliable prediction of oscillation frequency, and increased variability
Active Publication Date: 2009-07-15
VIA TECH INC
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Problems solved by technology
[0007] In addition, conventional VCOs require large die size, low linearity, and no signal modulation capability
However, the parasitic effect of the circuit layout increases the variability of the set oscillation frequency, so the oscillation frequency cannot be reliably predicted
[0008] It can be seen that the above-mentioned existing voltage controlled oscillator system obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.
In order to solve the problems existing in the voltage-controlled oscillator system, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above problems. This is obviously a problem that relevant industry players are eager to solve
Method used
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[0086] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, and characteristics of the symmetric voltage-controlled oscillator system proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. and its efficacy are described in detail below.
[0087] The LC tank VCO circuit with better performance will be described in detail below.
[0088] figure 1 It is a traditional LC tank voltage controlled oscillator system circuit 100 . The circuit 100 includes two variable capacitors 102 , two inductors 104 , two NMOS cross-coupled MOSFET structures 106 , and a constant current power source 108 . The NMOS cross-coupled MOSFET structure 106 provides the necessary negative resistance to cancel the resonator losses. Oscillation occurs when the loop gain is greater than 1 and when the im...
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A VCO system embodying the features of the present invention includes a frequency tuning circuit, a modulation circuit coupled in a parallel fashion with the frequency tuning circuit, a band tuning circuit coupled with the frequency tuning circuit in a parallel fashion having at least one switching circuit, a core circuit coupled with the frequency tuning circuit, the modulation circuit, and the band tuning circuit, wherein upon asserting a switching signal and upon adjusting a frequency turning signal, a frequency tuning bias signal, and a band tuning signal, the switching circuit is enabled for configuring the band tuning circuit to join the frequency tuning circuit for adjusting a predetermined output frequency based on a total inductance and a total capacitance provided by the core circuit, the frequency tuning circuit, the modulation circuit and the band tuning circuit.
Description
technical field [0001] The invention relates to a semiconductor voltage-controlled oscillator, in particular to an integrated and improved design of a high-linearity signal modulating voltage-controlled oscillator. Background technique [0002] With the popularization of mobile phones, wireless architecture and circuit technology have received special attention. In addition, the miniaturization of complementary metal oxide semiconductor (CMOS) technology in recent years has greatly improved the radio frequency (RF) characteristics of MOS devices. One example of the improvement of MOS RF technology is the use of low-cost MOS technology to realize the design of a single crystal transceiver (transceiver). Therefore, MOS radio frequency RF CMOS integrated circuit (IC) technology has advanced to be applicable to commercial use. [0003] One of the key components of a wireless communication transceiver is a voltage-controlled oscillator, which is part of a frequency synthesizer ...
Claims
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IPC IPC(8): H03B1/04H03B5/12H03B5/08H03L7/099
CPCH03B5/1243H03B5/1228H03L2207/06H03B2201/0266H03J5/244H03B5/1215H03L7/10H03C3/0958H03B5/1265H03L7/099H03B5/1212
Inventor 施博议何志龙郑念祖
Owner VIA TECH INC