Thomas J. Walczak

TL;DR: A communication device (104) includes two housings (108, 110), each containing circuitry (114, 115, 116, 117, 118, 122, 123) for operating the communication device in different modes (700, 702, 704, 706, 730, 732) as mentioned in this paper.

TL;DR: Improved temperature compensated, automatic output control (AOC) circuitry for RF signal power amplifiers is described in this paper that maintains the output power within one-half dB of a selected one of eight power levels varying from nine milliwatts to five watts, a dynamic range of twenty-eight dB.

TL;DR: In this article, a unique cellular portable telephone (100) automatically accommodates a power source change during a cellular telephone call between the portable's battery (300) and another battery or an external power source from vehicular adaptor (200), such as, for example, a battery eliminator adaptor, a hands-free adaptor or a mobile transceiver adaptor.

TL;DR: A TDMA cellular telephone (600) as mentioned in this paper includes, in its transmit signal path, microphone (608), vocoder (612), data format circui-try (601), quadrature modulator (602), 90 MHz local oscillator (606), transmitter with mixer (604), transmitter filter (618), and an-tenna (620).

TL;DR: In this paper, a communication device with two housings 108, 110 each containing circuitry for operating the communication device 104 in different modes is presented, including telephone, video conferencing, camera, phonebook and notepad modes.