Radio frequency power detector and decision circuit used with DC supply voltage controlled power amplifiers
First Claim
1. A power detector and decision circuit comprising:
- a non-inverting RF detector circuit operable to;
receive an RF input signal; and
provide a non-inverting detector output signal that is a DC representation of the RF input signal such that the non-inverting detector output signal increases as the RF input signal increases; and
an inverting RF detector circuit operable to;
receive the RF input signal; and
provide an inverting detector output signal that is a DC representation of the RF input signal such that the inverting detector output signal decreases as the RF input signal increases; and
a differential input amplifier operable to;
receive the non-inverting detector output signal and the inverting detector output signal; and
provide a control output signal that changes in relation to the RF input signal.
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Accused Products
Abstract
The present invention is an active RF power detector and decision circuit, which is used to provide a DC signal to circuitry that controls the DC supply voltage to an RF power amplifier. The DC signal is proportional to the amount of RF power detected within specified operating limits. When the RF power detected is above the maximum operating limit, the DC signal is set to its maximum value. When the RF power detected is below the minimum operating limit, the DC signal is set to its minimum value. The active RF power detector and decision circuit does not require an external DC reference voltage. Since the active RF power detector and decision circuit uses active components, the input impedance is high enough to use resistors to couple the RF input signal instead of a lower impedance RF coupler and the response time is faster than a passive envelope detector.
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Citations
20 Claims
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1. A power detector and decision circuit comprising:
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a non-inverting RF detector circuit operable to; receive an RF input signal; and provide a non-inverting detector output signal that is a DC representation of the RF input signal such that the non-inverting detector output signal increases as the RF input signal increases; and an inverting RF detector circuit operable to; receive the RF input signal; and provide an inverting detector output signal that is a DC representation of the RF input signal such that the inverting detector output signal decreases as the RF input signal increases; and a differential input amplifier operable to; receive the non-inverting detector output signal and the inverting detector output signal; and provide a control output signal that changes in relation to the RF input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification