Low voltage digital interface

Details Low voltage digital interface Low voltage digital interface

2007-10-16

2007-10-16

Sobutka, Philip J. (Department: 2684)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S343100, C455S164200, C455S183200, C455S333000

Reexamination Certificate

active

09823681

ABSTRACT:
A system is disclosed for interfacing a wireless communication device baseband module and a radio frequency integrated circuit. The system accepts a control signal from the baseband module. The control signal from the baseband module is generally at a first baseband voltage. The first baseband voltage is generally the baseband operating voltage level. The system distributes the control signal, via data latches, to a plurality of local level shifters. The plurality of local level shifters are associated with components of the radio frequency integrated circuit. The local level shifters convert the control signal to a shifted control signal at a second voltage level. The second voltage level is generally the component operating voltage. The shifted control signal may be maintained at the component while the radio frequency integrated circuit is intermittently shutdown. The system eliminates the need to reprogram radio frequency integrated circuit components after the shutdown period.

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U.S. Appl. No. 09/386,865, filed Aug. 31, 1999, Dmitriy Rozenblit, et al., “Multi-Band Transceiver Utilizing Direct Conversion Receiver”, 77 pages.
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Ian Doyle, “A Simplified Subharmonic I/Q Modulator”,Applied Microwave&Wireless, Oct. 1998.
Takafumi Yamaji et al., “An I/Q Active Balanced Harmonic Mixer with IM2 Cancelers and a 45° Phase Shifter”,IEEE Journal of Solidfa-State Circuits, vol. 33, No. 12, Dec. 1998.

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