RF transmitter using digital-to-RF conversion

Details RF transmitter using digital-to-RF conversion RF transmitter using digital-to-RF conversion

2005-12-27

2005-12-27

Liu, Shuwang (Department: 2634)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S333000, C455S323000, C455S296000, C455S313000, C455S318000, C375S150000, C327S113000, C327S100000, C332S103000

Reexamination Certificate

active

06980779

ABSTRACT:
An RF transmitter having two digital to RF-conversion devices that combine the D/A conversion function and the upconversion function by a RF-carrier or IF-signal. The device comprises a plurality of parallel unit cells, each of which is a mixer cell type converter having a differential data switch section connected in series to a differential LO-switch pair. The differential LO-switch is further connected in series to a current source. Each unit cell is adapted to receive a control voltage indicative of a data signal value.

REFERENCES:
patent: 4088905 (1978-05-01), Comer
patent: 5448772 (1995-09-01), Grandfield
patent: 6545516 (2003-04-01), Ylamurto et al.
patent: 1338085 (2003-08-01), None
patent: WO 02/37667 (2002-05-01), None
IEEE Journal of Solid-State Circuits 0018-9200/02, vol. 37, No. 9; Gutierrez-Aitken et al.; “Ultrahigh-Speed Direct Digital Synthesizer Using InP DHBT Technology”; pp. 1115-1119; Sep. 2002.
IEEE 2001 Custom Integrated Circuits Conference 0/7803/6591-7/01; Splett et al.; “Solutions for highly integrated future generation software radio basestation transceivers”; pp. 511-518; 2001.
IEEE 0-7803-3625-9/96; Koli et al.; “Current-Mode Up-Converting D/A-Interface for Mobile Communication Transmitter Applications”; pp. 20-24; 1996.
IEEE 0018-9200/03; Zhou et al.; “A 10-Bit Wide-Band CMOS Direct Digital RF Amplitude Modulator”; pp. 1182-1188; 2003.

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