| US 7,542,731 B2 | ||
| Radio frequency transceiver | ||
| Bong-Hyuk Park, Daejon (Korea, Republic of); Jong-Won Kim, Daejon (Korea, Republic of); Yong-Il Jun, Daejon (Korea, Republic of); and Hyeong-Ho Lee, Daejon (Korea, Republic of) | ||
| Assigned to Electronics and Telecommunications Research Institute, (Korea, Republic of) | ||
| Filed on Apr. 22, 2004, as Appl. No. 10/831,633. | ||
| Claims priority of application No. 10-2003-0048805 (KR), filed on Jul. 16, 2003. | ||
| Prior Publication US 2005/0014466 A1, Jan. 20, 2005 | ||
| Int. Cl. H04B 1/40 (2006.01) | ||
| U.S. Cl. 455—84 [455/86; 455/260; 455/255; 455/85; 455/87] | 4 Claims |
| 1. An apparatus for transmitting/receiving a radio frequency signal, comprising:
a receiving means for converting a radio frequency signal received by an antenna into an intermediate signal based on an intermediate
frequency (IF) band local signal;
a transmitting means for converting an intermediate signal into a radio frequency signal based on a radio frequency (RF) band
local signal; and
a local signal generating means for generating the IF band local signal and the RF band local signal, wherein said local signal
generating means includes:
a phase locked loop (PLL) for both the receiving means and the transmitting means for selecting a channel to reduce interference
with the radio frequency signal;
a voltage control oscillator for generating a first local signal based on the channel selected by the PLL;
a multiplier for multiplying the frequency of the first local signal by a predetermined number to generate a multiplied signal;
an amplifier for amplifying the multiplied signal to generate the RF band local signal;
a divider for dividing the frequency of the first local signal by a predetermined number to generate a divided signal; and
a phase shifter for shifting a phase of the divided signal to generate the IF band local signal.
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