Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1997-02-19
1999-02-16
To, Doris H.
Telecommunications
Transmitter
With feedback of modulated output signal
455127, 330289, 330278, 330129, 327513, H04B 104
Patent
active
058730290
ABSTRACT:
An RF power detector (10) includes an RF detector circuit (12), a nonlinear feedback amplifier (14), a temperature compensation circuit (16) and a linear feedback amplifier circuit (18). The RF detector circuit converts an RF signal to a voltage representative of the RF signals power level. Nonlinear feedback amplifier (14) nonlinearly amplifies the voltage and compensates for the nonlinearities of the RF detector circuits detector elements. Temperature compensation element provides a temperature compensation signal to compensate for the temperature effects of the detector elements of RF detector circuit (12). The output signal of RF power detector (10) is a substantially linearly representation of the RF input signals power level. Nonlinear feedback amplifier (14) includes a nonlinear feedback circuit (30) with a nonlinear feedback element (32) in the feedback path of op-amp (42). Power detection at microwave and millimeter wave frequencies is accomplished with the high dynamic range, high sensitivity, low minimum detection level and temperature sensitivity. The RF power detector is very producable and requires virtually no manual circuit tailoring or tuning.
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Buer Kenneth Vern
Corman David Warren
Grondahl Christopher David
Gorrie Gregory J.
Motorola Inc.
To Doris H.
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