| 摘要 |
<p>An RF receiver (200) having a receive antenna (202) for receiving RF signals and a micropower RF amplifier (27), the RF receiver (200) further characterized by: a) a frequency selecting network (204), connected to said receive antenna (202), for determining one or more desired tuning frequencies; b) a sampling mixer (206) connected to said frequency selecting network (204) and having an average impedance, for periodically sampling said RF signals to obtain a sampled replica of said RF signals; c) said frequency selecting network (204) acting as an impedance matching network, for providing a matched termination to said antenna (202) and a high impedance output to match said average impedance of said sampling mixer (206), d) said frequency selecting network (204) having a relatively long unloaded output period and a long non-conductive sampling interval, whereby said frequency selecting network (204) accumulates and stores energy during said non-conductive sampling interval, and, at the time of sampling, the stored energy is substantially extracted; and e) said micropower amplifier (27), connected to said sampling mixer for amplifying said sampled replica signals. <IMAGE></p> |
