| 摘要 |
An ultra-wide band general purpose analog to digital signal processor (200) covering the radio frequency range from 20 MHz to 5 GHz. The processor (200) includes a first circuit for shifting a frequency of an input signal, a second circuit for processing the input signal, and a third circuit for selectively bypassing the first circuit whereby the input signal is provided directly to the second circuit in a first mode of operation and to the second circuit via the first circuit in a second mode of operation. In the illustrative embodiment, the first circuit is a mixer (12) with a normalized mixing ratio of 0.8 to 0.9. The second circuit is a sigma-delta analog-to-digital converter (14). The third circuit is a switch (10) for passing the input signal directly to the second circuit if the input is 20 MHz to 2 GHz, or for passing the input signal to the first circuit if the input is 2 GHz to 5 GHz. In the preferred embodiment, the switch (10), the mixer (12), and the sigma-delta converter (14) are disposed on a single application specific integrated circuit (ASIC) substrate (100).
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