Polar modulation transmitter

Details Polar modulation transmitter Polar modulation transmitter

2006-07-04

2006-07-04

Vo, Nguyen T. (Department: 2685)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S116000, C455S108000, C330S295000

Reexamination Certificate

active

07072626

ABSTRACT:
A polar modulation transmitter circuit provides reduced ACPR in its output signal by controlling the relative delay between its envelope and phase modulation operations based on direct or indirect feedback measurement the output signal's ACPR. Such measurement and associated control may be based on a delay controller that includes an ACPR measurement circuit and a delay control circuit. Additionally, or alternatively, the polar modulation transmitter circuit provides a greatly extended transmit power control range by using a staged amplifier circuit that includes a driver amplifier circuit operating in combination with a power amplifier circuit to impart desired envelope modulation. In an exemplary embodiment, the driver amplifier circuit is implemented as differential transistor pairs responsive to tail current modulation. As such, the driver amplifier circuit is suited in particular for economical and space saving integration within a transmitter or transceiver integrated circuit (IC).

REFERENCES:
patent: 6147553 (2000-11-01), Kolanek
patent: 2002/0141510 (2002-10-01), Sridharan et al.
patent: 2003/0035494 (2003-02-01), Bauder et al.
patent: 2003/0072388 (2003-04-01), Yellin et al.
patent: 2003/0109234 (2003-06-01), Shi
patent: 2004/0021516 (2004-02-01), Oishi et al.
patent: 2807252 (2001-10-01), None
patent: WO 0124356 (2001-04-01), None
patent: WO 0233820 (2002-04-01), None
patent: WO 02/061938 (2002-08-01), None
patent: WO 02078281 (2002-10-01), None

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