H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/40 (2006.01) H03G 3/30 (2006.01) H04Q 7/32 (2006.01)
Patent
CA 2170667
A circuit for maintaining the magnitude of a radio frequency (RF) signal at least one predetermined level employs a detection circuit (16) coupled to an RF signalgenerator (22) by a four port coupling device (12). In one embodiment of the present invention, an impedance inverter (30) in series with a diode (D3) is connected between the load termination (L) of the coupling device (12) and ground. The series combination of the impedance inverter and diode approximates a short circuit as the output signal power approaches a predetermined low amplitude threshold and approximates an open circuit as the output signal power approaches a predetermined upper amplitude threshold so that gain is provided to signals received by the detection circuit below a first amplitude level and attenuation is provided to signals received by the detection circuit above a second amplitude level. The transmit level detection circuit of the present invention requires substantially less power than conventional circuits, so that only 1%-2% or less of the output of the amplifier need be diverted for reliable operation, even for RF output power levels on the order of a fraction of a milliwatt.
At&t Ipm Corp.
Kirby Eades Gale Baker
LandOfFree
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