Title:
信号の周波数を変換するためのシステムおよび方法
Document Type and Number:
Japanese Patent JP4416660
Kind Code:
B2
Abstract:
A translational-loop transmitter generates RF signals using at most one phase-locked-loop (PLL) circuit. In one embodiment, a single PLL generates two local oscillation signals. The first oscillation signal is mixed with a baseband signal to generate an intermediate frequency signal. The second oscillation signal is input into the translational loop to adjust a voltage-controlled oscillator to the desired carrier frequency. In order to perform this type of modulation, the frequencies of the local oscillation signals are set so that they are harmonically related to one another relative to the carrier frequency. Other embodiments generate only one oscillation signal. Under these conditions, the intermediate frequency signal is generated using the oscillation signal, and a frequency divider in the translational loop is used to generate a control signal for adjusting the voltage-controlled oscillator to the carrier frequency. In still other embodiments, a transmitter signal is generated without using any phase-locked-loop circuits. This is accomplished by generating an intermediate frequency signal using a crystal oscillator, and then using a frequency divider in a feedback loop to generate a control signal for adjusting the voltage-controlled oscillator to the carrier frequency. By minimizing the number of phase-locked-loop circuits in the transmitter, the size, cost, and power requirements of mobile handsets may be significantly reduced.
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Inventors:
Lee Can-Young
Song Enseok
Lee Jung-Woo
Park Joan Flies
Lee Kyung Go
Song Enseok
Lee Jung-Woo
Park Joan Flies
Lee Kyung Go
Application Number:
JP2004548628A
Publication Date:
February 17, 2010
Filing Date:
October 31, 2003
Export Citation:
Assignee:
GTC Semiconductor Inc.
International Classes:
H04L27/36; H03C3/09; H04B1/04
Domestic Patent References:
| JP2004513551A | ||||
| JP2002064575A | ||||
| JP6169328A | ||||
| JP8088660A | ||||
| JP5067969A |
Foreign References:
| US20020008588 | ||||
| US6122326 | ||||
| US6018275 | ||||
| US6115079 |
Attorney, Agent or Firm:
Yoshikazu Tani
Kazuo Abe
Kazuo Abe