Improved method and apparatus for up-conversion of radio frequency (rf) signals
Номер патента: EP1208651A1
Опубликовано: 29-05-2002
Автор(ы): Chris Snyder, Gareth Weale, Tajinder Manku
Принадлежит: Sirific Wireless ULC
Опубликовано: 29-05-2002
Автор(ы): Chris Snyder, Gareth Weale, Tajinder Manku
Принадлежит: Sirific Wireless ULC
Реферат: This patent describes a method and system which overcomes the LO-leakage problem of direct conversion and similar RF transmitters and receivers. To solve this problem a virtual LO(TM) signal is generated which emulates mixing with a local oscillator (LO) signal. However, the virtual local oscillator (VLO) signal is constructed using signals that do not contain a significant amount of power (or no power at all) at the wanted output RF frequency, so there is no LO component to leak to the output. The invention also does not require sophisticated filters or large capacitors as other designs in the art, so it is fully integratable.
Improved method and apparatus for up-conversion of radio frequency (rf) signals
Номер патента: WO2001017121A1. Автор: Tajinder Manku,Chris Snyder,Gareth Weale. Владелец: Sirific Wireless Corporation. Дата публикации: 2001-03-08.