Transmitter switch-on in a dual-mode mobile phone

Details Transmitter switch-on in a dual-mode mobile phone Transmitter switch-on in a dual-mode mobile phone

1991-10-22

1994-01-04

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 95, 455119, 455127, 330 51, 330310, 379 59, H01Q 1112, H04B 104

Patent

active

052769178

ABSTRACT:
A method for providing a positive transmitter power switch-on in a dual-mode mobile phone is disclosed. According to the invention the transmitter is switched on in two or more phases, controlled by the mobile phone microprocessor program. Preferably the power amplifier sections are switched on in a sequence, so that the output power amplifier sections (3 and 4) are first switched on by enabling the transmit enable signal (TXE). Then the input power amplifier sections (1 and 2) are switched on by enabling ramp-up signal (RAMP-UP) Transmission is thereafter enabled by the transmit power control signal (TXC) being switched on, the amplifiers then output the amplified radio frequency input signal (RFIN) to the duplex circuit (10) transmit terminal (TX).

REFERENCES:
patent: 3962553 (1976-06-01), Linder et al.
patent: 4288753 (1981-09-01), Babano
patent: 4371841 (1983-02-01), Eckert et al.
patent: 5020093 (1991-05-01), Pireh
patent: 5029005 (1991-07-01), Morris, Jr.
patent: 5060294 (1991-10-01), Schwent et al.
patent: 5109541 (1992-04-01), Park
patent: 5150075 (1992-09-01), Hietala et al.
patent: 5159283 (1992-10-01), Jensen

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