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Frequency synthesizer used in OFDM UWB

A technology of frequency synthesizer and multi-mode frequency divider, which is applied in the direction of automatic power control, transmission system, electrical components, etc., can solve the problems of high frequency, wide frequency band range, fast frequency hopping speed, etc., and achieve high frequency, frequency band wide range of effects

Active Publication Date: 2010-03-03
锐立平芯微电子(广州)有限责任公司
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Problems solved by technology

Compared with the traditional narrowband wireless communication system, the frequency synthesizer applied to UWB has the following difficulties: 1. High frequency (up to 10GHz); 2. Wide frequency range (several GHz order); 3. Fast frequency hopping ( on the order of nanoseconds)

Method used

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  • Frequency synthesizer used in OFDM UWB
  • Frequency synthesizer used in OFDM UWB

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0017] Such as figure 1 as shown, figure 1 It is a structural schematic diagram of a frequency synthesizer for OFDM UWB provided by the present invention. The frequency synthesizer adopts a phase-locked loop structure based on integer frequency division, which consists of phase frequency detector (PFD), charge pump (CP), low-pass filter (LPF), quadrature voltage-controlled oscillator (QVCO) and 64 ~127 multi-mode frequency dividers are connected sequentially, and the frequency and phase detectors are connected with 64~127 multi-mode frequency dividers at the same time, so that the frequency and phase detectors, charge pumps, low-pass filters, and quadrature voltage-controlled oscillations Device and 64 ~ 127 multi-mode ...

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Abstract

The invention discloses a frequency synthesizer used in orthogonal frequency division multiplexing ultra-wideband (OFDM UWB). The frequency synthesizer adopts a phase-locked loop (PLL) structure basedon integer frequency division and consists of a phase frequency detector (PFD), a charge pump (CP), a low pass filter (LPF), a quadrature voltage controlled oscillator (QVCO) and a 64-127 multi-modulus frequency divider which are connected in turn, wherein the PFD is connected with the 64-127 multi-modulus frequency divider at the same time to ensure that the PFD, the CP, the LPF, the QVCO and the 64-127 multi-modulus frequency divider are formed into the PLL structure. The frequency synthesizer provided by the invention can generate OFDM UWB local-oscillation signals of 10 frequency points including 4,356M, 4,620M, 6,336M, 6,600M, 6,864M, 7,128M, 7,392M, 7,656M, 7,920M, 8,184M, and the like, thereby realizing high frequency and wide frequency band and meeting the requirements of being applied in OFDM UWB.

Description

technical field [0001] The present invention relates to a high-speed short-distance wireless communication system applied in a Wireless Personal Area Network (WPAN), in particular to a frequency synthesizer for Orthogonal Frequency Division Multiplexing Wireless Ultra Wideband (OFDM UWB), It is an important circuit module in a wireless ultra-wideband (UWB) radio frequency transceiver. Background technique [0002] Wireless ultra-broadband technology is mainly used to realize short-distance, ultra-high-speed wireless communication. The transmission distance is generally within 10m at present, and the transmission rate can reach 480M / s or even higher. The characteristics of UWB's high transmission rate, low power consumption and no interference with existing wireless systems make UWB a hot spot now and in the next five years. It has achieved two major breakthroughs. In terms of spectrum division, it has created a "coexistence" situation; in terms of transmission speed, it has...

Claims

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Application Information

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IPC IPC(8): H03L7/18H04B1/69
Inventor 李志强张海英
Owner 锐立平芯微电子(广州)有限责任公司
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