Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1995-03-31
1997-10-14
Pham, Chi H.
Telecommunications
Transmitter
With feedback of modulated output signal
455115, H01Q 1112, H04B 104
Patent
active
056782098
ABSTRACT:
A circuit for maintaining the magnitude of a radio frequency (RF) signal at least one predetermined level employs a detection circuit coupled to an RF signal generator by a four port coupling device. In one embodiment of the present invention, an impedance inverter in series with a diode is connected between the load termination of the coupling device 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.
REFERENCES:
patent: 4009446 (1977-02-01), De Koning et al.
patent: 4127831 (1978-11-01), Riblet
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4823098 (1989-04-01), Demuro et al.
patent: 4963945 (1990-10-01), Cooper et al.
patent: 5032802 (1991-07-01), Fry
patent: 5038112 (1991-08-01), O'Neill
patent: 5196806 (1993-03-01), Ichibara
patent: 5337006 (1994-08-01), Miyazaki
patent: 5337020 (1994-08-01), Daughtry et al.
patent: 5339462 (1994-08-01), Staudinger et al.
patent: 5361403 (1994-11-01), Dent
patent: 5363071 (1994-11-01), Schwent et al.
patent: 5367268 (1994-11-01), Baba
patent: 5481231 (1996-01-01), Dydyk et al.
Arthur Gertrude
Bartholomew Steven R.
Dinicola Brian K.
Lucent Technologies - Inc.
Pham Chi H.
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