Arrangement for saving energy in transmitter

Details Arrangement for saving energy in transmitter Arrangement for saving energy in transmitter

2005-11-22

2005-11-22

Mai, Lam T. (Department: 2819)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S129000, C330S133000

Reexamination Certificate

active

06967533

ABSTRACT:
An arrangement for saving energy in a radio device transmitter and a radio device. The steady currents of the transmitter amplifiers are made dependent on the transmitting power for reducing the losses of the amplifiers. The VGA (400) comprises at least one main differential pair (Q41–Q42; Q43–Q44) for controlling the gain and a bias differential pair (Q47–Q48) for controlling said steady currents. These pairs are steered by the one and the same voltage (ΔV), in which case the output current (Ib1; Ib2) of the bias differential pair changes in the same way as the output current (io1; io2) of the main differential pair when the gain is readjusted. The output current of the bias differential pair is used as a bias current of the transmitter amplifiers, i.e. as a current that determines the steady currents of the amplifiers. Because the values of the steady currents of the amplifiers track accurately the value of the gain, when this is changed, the steady currents are always so low as the transmitting power necessarily requires, at a given time, wherein the amount of needless losses, from the transmitting operation's point of view, is small. Said differential pairs are placed on one and the same substrate, in order to the control to function accurately in a wide dynamic range.

REFERENCES:
patent: 3968453 (1976-07-01), Hongu et al.
patent: 5432473 (1995-07-01), Mattila et al.
patent: 5625322 (1997-04-01), Gourgue et al.
patent: 5880631 (1999-03-01), Sahota
patent: 6107878 (2000-08-01), Black
patent: 6339361 (2002-01-01), Khesbak et al.
patent: 6532473 (2003-03-01), Niazi et al.

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