Signal processing integrated circuit device

Details Signal processing integrated circuit device Signal processing integrated circuit device

1991-05-21

1994-01-25

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 86, 370 13, 324 7611, 4552261, 381 7, H04B 346, H04B 1700, H03D 322, H03H 730

Patent

active

052822249

ABSTRACT:
There are provided a modulation circuit (9) and a signal processing circuit (2) on the same chip. The modulation circuit (9) modulates an input signal (30) to apply it to a selector (8). The selector (8) selectively applies to the signal processing circuit (2) either the input signal (30) or a modulated signal (40) in accordance with a select signal (50). The modulation circuit (9) is synchronized with the signal processing circuit (2) by a timing signal (11) from the signal processing circuit (2). For this reason, there is no need of an equipment for synchronizing the signal processing circuit (2) and the modulation circuit (9) in the test. A test signal provided from the exterior need not have been already modulated. Therefore, the test signal can be easily produced and confirmed, and the compression rate of the test signal is improved.

REFERENCES:
patent: 3875500 (1975-04-01), Fletcher et al.
patent: 4055808 (1977-10-01), Holsinger et al.
patent: 4219778 (1980-07-01), Ishii
patent: 4500920 (1985-02-01), Ohyama et al.
patent: 4918623 (1990-04-01), Lockitt et al.

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